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this manual contains new product information. fortune semiconductor corporation reserves the rights to modify the product specification without further notice. no liability is assumed by fortune semiconductor corporation as a result of the use of this product. no rights under any patent accompany the sale of the product. cr-004 f f s s 9 9 7 7 2 2 1 1 _ _ l l p p 3 3 4,000 counts auto range dmm ic. d d a a t t a a s s h h e e e e t t fs9721_lp3-ds-18_en rev. 1.8 semiconductor corporation f or t u n e ?w???
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 2/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 content page 1. introduction 3 2. features 3 3. measurable modes 3 4. application field 4 5. block diagram 4 6. pin diagram 5 7. pin description 5 8. dice pad layout & pad coordinate 8 9. technical specification 9 10. measurement mode select 11 11. keys definition 12 12. other functions 13 13. rs232 transmission protocol 13 14. lcd display 14 15. application description 15 16. package outline 27 17. demo board 28 18. ordering information 32 19. revision history 33
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 3/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 1. introduction fs9721_lp3 is a high performance, low power consumption and 3 3 /4 digits (4000 counts) analog to digital converter that built-in the microprocessor (adc+mcu). it includes the 8 bits microprocessor, low noise and high stability opamp, ac rectifier opamp, voltage promotion and regulated voltage power, high regulated bandgap, auto measurement switch and function control circuit, buzzer driver circuit, clock oscillation circuit, backlight display control circuit, lcd display driver circuit and so on. with the microprocessor, fs9721_lp3 can process the logic function control via i/o ports, and through the codes of mea1 ? mea4 pins, it can assemble various measurement functions, as well as construct fully auto measurement meter through the code settings. for the settings of ra nge, select, hold, rel, blctr, hz/duty and reset keys, it can be fulfilled the measurement mode select, function switch, reading hold, relative value measurement, backlight display, frequency and duty cycle measurement, reset and so on functions by triggering these keys. fs9721_lp3 has the serial data output function so that users can connect the meter and the equipment of computer for recording, analyzing, processing and printing the measuring data. with regard to the auto power off function, when there is no action within 30 minutes on the switch or keys of the meter, the system will enter the sleep mode automatically to save the power. in the process of using the meter, if it is not necessary to power off automatically, the function can also be cancelled in use. fs9721_lp3 is made by large integrated circuit technology so that rise greatly up the reliability of the product, and make the design be simple and the volume be small. it takes low power voltage so as to be low power consumption and is convenient to use the power supply of battery, especially is proper for the use on the palm mode meter. fs9721_lp3 is a microprocessor-embedded and multifunctional measuring adc so that just less external components added, it can be a high accuracy, lots functions and low cost measuring meter. 2. features 2.1 max. display: 4000 counts (3 3/4 digits). 2.2 conversion rate: 3 times/sec. 2.3 the negative indication: auto. 2.4 power voltage range: 2.4v ? 3.6v. 2.5 chip power consumption: 6mw. 2.6 low battery warning: approx. 2.4v. 2.7 buzzer driver circuit (frequency is about 2.7khz). 2.8 rs232 serial data output 2.9 embedded opamp for ac/dc conversion. 2.10 function keys: range, hold/blctr, rel, select, hz/duty, rs232 and reset. 2.11 unit symbol and backlight display. 2.12 auto power-off. 3. measurable modes 3.1 dc voltage: 400.0mv, 4.000v, 40.00v, 400.0v, 1000v. 3.2 ac voltage: 400.0mv, 4.000v, 40.00v, 400.0v, 1000v. 3.3 dc current: 400.0a / 4000a,40.00ma / 400.0ma,10.00a. 3.4 ac current: 400.0a / 4000a,40.00ma / 400.0ma,10.00a,400.0a / 4000a.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 4/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 3.5 resistance: 400.0 , 4.000k , 40.00k , 400.0k , 4.000m , 40.00m . 3.6 capacitance: 51.20nf,512.0nf,5.120 f,51.20 f,100.0 f(15sec). 3.7 frequency: 5.120hz,51.20hz,512.0hz,5.120khz,51.20khz,512.0khz,5.120mhz . 3.8 duty cycle: 0.1% ? 99.9%. 3.9 diode: 0v ? 1.5 v. 3.10 open-short test: sound when lower than 50 . 4. application field 4.1 auto measurement palm digital multimeter. 4.2 auto measurement card digital multimeter. 4.3 auto measurement pen digital multimeter. 4.4 auto measurement clinch meter (hook meter, clamp meter, etc.). 4.5 number panel meter. 5. block diagram battery crystal ac-to-dc converter dmm signal conditioning network external regulation voltage double voltage regulator low battery detector & bandgap reference oscillator & clock generator rotary switch and push button microprocessor lcd driver lcd display function,range routers,opamps, comparators & ohm source network input diagram 1 block diagram
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 5/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 6. pin diagram 1 op2n 2 nc 3 op2o 4 adip 5 nc 6 adin 7 nc 8 sa 9 sgnd 10 adp 11 dt 12 nc 13 smv 14 cres1 15 rl 16 nc 17 rcap 18 onek 19 nc 20 tenk 21 nc 22 hunk 23 nc 24 onem 25 nc 26 tenm 27 cres2 28 tstb 29 adpc1 30 adpc2 31 select 32 range 33 rel 34 hold 35 hz/duty 36 cap 37 mea4 38 mea3 39 mea2 40 mea1 41 lcdc1 42 lcdc2 43 tsta 44 vss 45 nc 46 agnd 47 nc 48 vdd 49 nc 50 nc 51 nc 52 vb 53 nc 54 cb 55 ca 56 vgg 57 nc 58 vdda 59 rlcd 60 nc 61 xin 62 xout 63 nc 64 txd 65 nc 66 seg14 67 seg13 68 seg12 69 seg11 70 seg10 71 seg9 72 seg8 73 seg7 74 seg6 75 seg5 76 seg4 77 seg3 78 seg2 79 seg1 80 com1 81 com2 82 com3 83 com4 84 entx 85 beeper 86 blout 87 rst 88 nc 89 refi 90 refo 91 fta 92 nc 93 ftb 94 ftc 95 tstc 96 op1n 97 nc 98 op1o 99 nc 100 op2p fs9721_lp3 diagram 2 100pin package 7. pin description package 100 pad 78 symbol i/o description 1 1 op2n i the negative input of dc/ac converter operation amplifier 2 nc empty pin 3 2 op2o o output of dc/ac converter operation amplifier 4 3 ad1p i adc positive input of ac measurement 5 nc empty pin 6 4 ad1n i adc negative input of ac measurement 7 nc empty pin 8 5 sa i adc input of current measurement 9 6 sgnd i adc negative input of analog ground connection 10 7 adp i additional adc positive input 11 8 dt i/o connecting point of voltage division resistance of diode measurement 12 nc empty pin 13 9 smv i high resistance voltage input / adc positive input of resistance measurement / connecting point of voltage division resistance of diode measurement 14 10 cres1 i/o wave filter capacitance connecting point of measuring point of resistance measurement 15 11 rl i the negative input of voltage reference of resistance measurement 16 12 nc empty pin
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 6/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17 13 rcap i/o calibrating resistance connecting point of capacitance measurement 18 14 onek i/o resistance 1.001k ? connecting point of voltage and resistance measurement 19 nc empty pin 20 15 tenk i/o resistance 10.010k ? connecting point of voltage and resistance measurement 21 nc empty pin 22 16 hunk i/o resistance 101.010k ? connecting point of voltage and resistance measurement 23 nc empty pin 24 17 onem i/o resistance 1.111m ? connecting point of voltage and resistance measurement 25 nc empty pin 26 18 tenm i/o resistance 10.000m ? connecting point of voltage and resistance measurement 27 19 cres2 i/o capacitance connecting point of regulated voltage source of voltage and resistance measurement 28 20 tstb i current measurement mode select (see 15.13 ?current measurement?) 29 21 adpc1 i max. input voltage 400mv/40mv select (see 10.4) 30 22 adpc2 i measure signals dc/ac select (see 10.4) 31 23 select i measurement function select 32 24 range i auto/manual switch select 33 25 rel i hold relative value 34 26 hold i reading hold/ backlight control 35 27 hz/duty i frequency/duty cycle measurement select 36 28 cap i capacitance measurement function select 37 29 mea4 i measurement function select 38 30 mea3 i measurement function select 39 31 mea2 i measurement function select 40 32 mea1 i measurement function select 41 33 lcdc1 i self-defined symbol display assembly with lcdc2 (see 10.3) 42 34 lcdc2 i self-defined symbol display assembly with lcdc1 (see 10.3) 43 35 tsta i testing pin 44 36 vss i the negative input of power source 45 nc empty pin 46 37 agnd i analog signal ground connection 47 nc empty pin 48 38 vdd i the positive input of power source 49 nc empty pin 50 nc empty pin 51 nc empty pin 52 39 vb i bias current input 53 nc empty pin 54 40 cb i/o the negative connecting point of double voltage capacitance 55 41 ca i/o the positive connecting point of double voltage capacitance
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 7/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 56 42 vgg o double voltage circuit output 57 nc empty pin 58 43 vdda o regulated power output/analog power source 59 44 rlcd i the connecting point of lcd driver voltage adjusting resistance 60 nc empty pin 61 45 xin i oscillator connecting point 62 46 xout o oscillator connecting point 63 nc empty pin 64 47 txd o rs232 serial data output 65 nc empty pin 66 48 seg14 o segment 14 67 49 seg13 o segment 13 68 50 seg12 o segment 12 69 51 seg11 o segment 11 70 52 seg10 o segment 10 71 53 seg9 o segment 9 72 54 seg8 o segment 8 73 55 seg7 o segment 7 74 56 seg6 o segment 6 75 57 seg5 o segment 5 76 58 seg4 o segment 4 77 59 seg3 o segment 3 78 60 seg2 o segment 2 79 61 seg1 o segment 1 80 62 com1 o backplane 1 81 63 com2 o backplane 2 82 64 com3 o backplane 3 83 65 com4 o backplane 4 84 66 entx i rs232 output control 85 67 beeper o buzzer driver output 86 68 blout o backlight driver output 87 69 rst i cpu reset 88 nc empty pin 89 70 refi i adc voltage reference input 90 71 refo o bandgap output 91 72 fta o adc wave pre-filter positive output 92 nc empty pin 93 73 ftb i adc wave pre-filter positive input 94 74 ftc i/o the negative terminal of adc wave pre-filter 95 75 tstc i testing pin 96 76 op1n i the negative input of ac signal buffer operation amplifier 97 nc empty pin 98 77 op1o o ac signal buffer operation amplifier output 99 nc empty pin 100 78 op2p i the positive input of ac/dc converter operation amplifier
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 8/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 8. dice pad layout & pad coordinate substrate should be connected to vss. pad opening: 90 m. chip size: 3.24mm 2.58mm. diagram 3 78pin dice pad no. name x[mm] y[mm] padno. name x[mm] y[mm] 1 op2n 0.264 0.077 40 cb 2.974 2.495 2 op2o 0.404 0.077 41 ca 2.834 2.495 3 adip 0.544 0.077 42 vgg 2.694 2.495 4 adin 0.669 0.077 43 vdda 2.569 2.495 5 sa 0.794 0.077 44 rlcd 2.444 2.495 6 sgnd 0.919 0.077 45 xin 2.319 2.495 7 adp 1.044 0.077 46 xout 2.194 2.495 8 dt 1.169 0.077 47 txd 2.069 2.495 9 smv 1.294 0.077 48 seg14 1.923 2.495 10 cres1 1.419 0.077 49 seg13 1.798 2.495 11 rl 1.544 0.077 50 seg12 1.673 2.495 12 n.c 1.669 0.077 51 seg11 1.548 2.495 13 rcap 1.794 0.077 52 seg10 1.423 2.495 14 onek 1.919 0.077 53 seg9 1.298 2.495 15 tenk 2.044 0.077 54 seg8 1.173 2.495 16 hunk 2.169 0.077 55 seg7 1.048 2.495
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 9/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17 onem 2.294 0.077 56 seg6 0.923 2.495 18 tenm 2.419 0.077 57 seg5 0.798 2.495 19 cres2 2.544 0.077 58 seg4 0.673 2.495 20 tstb 2.669 0.077 59 seg3 0.548 2.495 21 adpc1 2.809 0.077 60 seg2 0.408 2.495 22 adpc2 2.949 0.077 61 seg1 0.268 2.495 23 select 3.147 0.077 62 com1 0.091 2.495 24 range 3.157 0.396 63 com2 0.077 2.176 25 rel 3.157 0.536 64 com3 0.077 2.036 26 hold 3.157 0.661 65 com4 0.077 1.911 27 hz/duty 3.157 0.786 66 entx 0.077 1.786 28 cap 3.157 0.911 67 beeper 0.077 1.661 29 mea4 3.157 1.036 68 blout 0.077 1.536 30 mea3 3.157 1.161 69 rst 0.077 1.411 31 mea2 3.157 1.286 70 refi 0.077 1.286 32 mea1 3.157 1.411 71 refo 0.077 1.161 33 lcdc1 3.157 1.536 72 fta 0.077 1.036 34 lcdc2 3.157 1.661 73 ftb 0.077 0.911 35 tsta 3.157 1.786 74 ftc 0.077 0.786 36 vss 3.157 1.911 75 tstc 0.077 0.661 37 agnd 3.157 2.036 76 op1n 0.077 0.536 38 vdd 3.157 2.176 77 op1o 0.077 0.396 39 vb 3.148 2.495 78 op2p 0.083 0.077 9. technical specification vdd=3v ta=25 symbol parameter test condition min typ max units vdd recommend operation power voltage 2.4 3.6 v idd supply current at dcv mode 1.5 2 ma ipo power supply current at power off 10 a vih digital input high voltage vdd-0.5 v vil digital input low voltage 0.5 v ipu pull up current vin=0 5 10 a agnd analog ground voltage vdd/2 -3% vdd/2 vdd/2 +3% v vdda analog power 3.4 3.7 4 v vband build in reference voltage relative agnd 1.1 1.25 1.4 v build in reference voltage output voltage coefficient vdd=2.4v~3.6v -2000 +2000 ppm/v refi recommend reference input voltage relative agnd 0.44 v vbatt low battery detector voltage 2.25 2.4 2.55 v flcd lcd frame frequency 32 hz vlcd lcd pk-pk driver voltage 2.8 3 3.2 v
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 10/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 fbeep beeper frequency 2.7 khz frs232 rs232 baud rate 2400 bit irsout rs232 output high current voh=2v 2 ma zero input reading dc adpxl input=0v -0.001 0.000 0.001 linearity (max. deviation from best straight line fit dc adpxl input,full scale 240.0mv -1 0 +1 counts ac measurement bandwidth error ac adpxl input240mvrms 20hz~1khz 0.2 % rcc continuity check value 10 60 ohm adc measurement o.l display count 4050 counts autorange up counts 4000 counts autorange down counts 360 counts vfrea frequency counter input level (hz/duty control) vil(relative to agnd) -60 mv vih(relative to agnd) 60 mv fmaxa frequency counter max input frequency (hz/duty control) vpp= 100mv square wave input 500k hz *1 duty measurement min pulse width error (hz/duty control) vpp= 100mv square wave input 1 s vfred frequency counter input level (meas=0101) vil(relative to agnd) -600 mv vih(relative to agnd) 600 mv fmaxd frequency counter input level (meas=0101) vpp= 600mv square wave input 5m hz *1 duty measurement min pulse width error(meas=0101) vpp= 600mv square wave input 100 ns 51.20 nf mode 2%+10 counts 512.0 nf mode 0.5%+3 counts 5.120 f mode 1%+2 counts capacitor measurement accuracy after zero input relative. to adjust with 512.0nf mode standard 51.20 f mode 1.5%+2 counts *1 if input square wave during duty cycle measurement, then the deviation is mainly from the analyzable pulse width of the comparator itself. if the value is an input 100khz square wave, we can divide the square wave into 1000 parts (1000counts), and each part is 10ns. therefore the largest deviation in duty cycle measurement is (100ns/10ns)=10counts. the output 50.0% signal may be measured 50.0% 1.0%, and the signal that larger than 99% or smaller than 1% may not be measured, then it will display 0.00%.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 11/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 10. measurement mode select 10.1 measurement mode select (mea1 ? mea4: open is ?1?; connect to vss is ?0?) range select jumper mea4 mea3 mea2 mea1 measurement function and select key function switch hz/duty rel hold 1 1 1 1 dcv/acv dcv/acv switch v/hz/duty switch j4 1 1 0 1 ohm/diode/cont./ cap cap=1:ohm/ diode /cont. switch cap=0:ohm/ diode/cont. /cap switch ohm j3, j5 1 0 1 0 dcv no mv mode v/ hz/duty switch j4 1 0 0 1 acv v/ hz/duty switch j4 1 0 1 1 dcmv v/hz/duty switch j3 1 0 0 0 10a dca/aca switch a/hz/duty switch j2 1 1 1 0 ma dcma/acma switch ma/hz/duty switch j2, j9 1 1 0 0 a dc a/ac a switch a/ hz/duty switch j2, j10 0 1 1 1 cap j3, j5 0 1 0 1 hz/duty hz/duty switch j6, j8 0 0 1 1 0 0 1 0 0 0 0 1 0 0 0 0 input from adp refer to table 10.2 0 1 1 0 input from adp 0 1 0 0 aca 400.a/4000a notes: in ?jumper? column, jx means the jx of the measurement is connected in the common use circuitry of diagram 6 and diagram 7. in auto mode, it has to press range key for acv mode to select acmv measurement. tstb=1, the current is input with 400mv/4v; tstb=0, the current is input with 40mv/400mv. for details, please refer to ?15.13 current measurement? . the mode is to input measuring hz/duty with adp path . adp can input 400.0mv/40.00mv, autoranging, display 4000, 400.0 . 10.2 adp input and self-defined symbol and decimal location (mea1 ? mea4: open is ?1?; connect to vss is ?0?) mea4 mea3 mea2 mea1 range of input vo l t a g e inpurt channel decimal location symbol location symbol 0 0 1 1 4000 0 0 1 0 400.0 0 0 0 1 40.00 0 0 0 0 400mv adp 4.000 decided by lcdc1 and lcdc2 users self-defined
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 12/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 10.3 located self-defined symbol in lcd by the assembly of lcdc1 and lcdc2 lcdc1 lcdc2 symbol location description 0 0 com1 seg14 1 0 com2 seg14 0 1 com3 seg14 1 1 com4 seg14 lcdc1 and lcdc2: open is ?1?; connect to vss is ?0? 10.4 the function of adpc1 and adpc2 in adp input (adpc1 and adpc2: open is ?1?; connect to vss is ?0?) adpc1 adpc2 dc/ac status adp max. input voltage 1 1 dc 1 0 ac 400mv 0 1 dc 0 0 ac 40mv 11. keys definition 11.1 range (auto/manual measurement switch) range key is the auto/manual measurement key that acts with trigger. power-on default is auto measurement, and press one time to switch to the manual measurement. in manual measurement mode, the system will jump up one mode for each press until the highest mode, then return to the lowest mode as a loop. if press the key over 2 seconds, the system will switch back to auto measurement status. frequency and capacitance measurement cannot use manual measurement. 11.2 hold /blctr (reading hold/backlight control) hold /blctr key is the reading hold /backlight control key that acts with trigger. the function is to hold the display of reading/backlight control. to press the key, the display value will be locked and keep unchanged. to press the key again, the locked status will be erased and enter the normal measurement status. when press and hold the key over 2 seconds, the backlight will be on. in the backlight on status, press the key over 2 seconds, the backlight will be off. 11.3 rel (relative value measurement) rel key is the relative value measurement key that acts with trigger. except hz/duty, diode and continuity, other functions can do the relative value measurement. 11.4 select (function switch) select is the function select key that acts with trigger. use the key as measuring functions select. 11.5 rs232 (serial output control) rs232 is the serial output control key that acts with lock. when the key is close, lcd displays rs232 symbol that means the meter enters the data transmission status, and is able to transfer the data out; when the key is open, it will exit and the data transmission status will stop. 11.6 hz/duty (frequency/duty cycle) hz/duty is the frequency/duty cycle select key that acts with trigger. in frequency measurement mode, press the key can select frequency or duty cycle measurement mode; in ac/dc voltage or ac/dc current mode, press the key can proceed to voltage/frequency/duty cycle or current/frequency/duty cycle measurement mode select.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 13/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 11.7 reset (reset key) reset is the reset key that acts with trigger. press the key to make the microprocessor to reset. 12. other functions 12.1 auto power off in the process of measuring, no matter the function key or switch, if there is no any action on them within 30 minutes, the meter will be ?auto power off? (standby mode). in auto power off status to press the function key or switch, the meter will be ?auto power on? (operating mode). to press and hold the ?select? key to turn the system on, the auto power off function will be cancelled. in rs232 operation mode, the auto power off function wil be cancelled. 12.2 buzzer when press any key or turn any function switch, the buzzer will raise one sound (approx. 0.25 second ? 1 second). when doing the open-short test, if the resistance is smaller than 50 , the buzzer will sound. 12.3 backlight the system has the backlight driver output to control the on and off of the backlight circuit. it provides the convenience to read in a dim light and worse vision. if press the hold/blctr key over approx. 2 seconds, the backlight will be on, and to press the key again over 2 seconds, the backlight will be off. 12.4 serial data output the system has the serial data output function. when the meter is connected with the equipment that has serial input interface (rs232) such as computer, it can output the measuring data for recording, analyzing, processing and printing the measuring results. 13. rs232 transmission protocol 13.1 direction: one-way to computer. 13.2 serial transer rate: 2400 bps 13.3 data bit: 8 bit. 13.4 odd and even calibration: no 13.5 data decimal: hex 13.6 data length: 14 bytes. 13.7 data information: lcd table on-off information. 13.8 data format: 1st byte 1x (x is seg1, 4 bits represent the data on the lcd table) 2nd byte 2x (x is seg2, 4 bits represent the data on the lcd table) 3rd byte 3x (x is seg3, 4 bits represent the data on the lcd table) and so on 1x 4 bit 2x 4 bit 3x 4 bit ????? exh 4it 13.9 x means: bit3 ? bit 0 segn (com4 D com1) 13.10 sampling rate: 40khz 13.11 adc output frequency: 40hz 13.12 adc output frequency after average: 10hz 13.13 output frequency after auto-zero: 4hz
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 14/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 14. lcd display -- fs9721_lp3(c2=lcdc2, c1=lcdc1) com1 1 com4 com2 2 com3 com3 3 com2 com4 4 com1 com1 com2 com3 com4 pin com 5 seg1 a1 a6 a5 6 seg2 a2 a7 a3 a4 7 seg3 b1 b6 b5 p1 8 seg4 b2 b7 b3 b4 9 seg5 c1 c6 c5 p2 10 seg6 c2 c7 c3 c4 11 seg7 d1 d6 d5 p3 12 seg8 d2 d7 d3 d4 13 seg9 k % 14 seg10 m ? m 15 seg11 v f 16 seg12 hz n a 17 seg13 c2_c1 = 0_0 18 seg14 aut o dc a1 a2 a3 a4 a5 a6 a7 s p1 rs232 k hz m a m v n f % ac hold p2 p3 b4 b5 b7 b6 b1 b2 b3 c6 c1 c2 c5 c3 c4 c7 d6 d1 d2 d7 d5 d3 d4 aut o dc s rs232 ac hold 9711_lp3 lcd display and format c2_c1 = 0_1 c2_c1 = 1_0 c2_c1 = 1_1 notes: 1. working voltage: 3v. 2. drive method: 1/4 duty, 1/3 bias. diagram 4 lcd display structure diagram 5 lcd display com driver waveform
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 15/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15. application description 15.1 common use circuitry a 100 pin package ic lcd bp1 buzzer r1 100k vdd r10 500k r8 40k vr1 vr10k r6 20k r7 10k r9 90k c11 4.7uf vr2 vr2k r13 28.5k r12 22k r11 100k r14 22k d1 1n914 d2 1n914 r15 100k ua/ma com 10a v/ohm/diode/cap r18 100k r19 900k j3 dcmv j2 amp r16 9.99 r17 990 r28 0.01 j7 ua j1 ma r20 100k r21 57.4k r22 1k r23 10k r24 101.01k r25 1.111m j4 dcv/acv r26 10m j5 ohm/cap/diode j6 hz j8 hz c15 10uf r29 1m s5 hz/duty s6 hold s7 rel s8 range s9 select c4 10uf c5 10uf s1 bt1 battery r2 1m xtal 4m hz r3 200k c1 10uf c3 10uf r4 100k c2 10uf adp adp blout adp2 ptc 1k c9 27nf c12 27nf c8 0.47uf c10 0.47uf ohm cap diode c13 27nf c14 47nf c6 10nf s2 reset r27 100k r30 1k d3 vdd 1 6 2 7 3 8 4 9 5 d4 r5 220 s4 s3 s10 s11 s12 s13 s15 s16 r31 10k c16 0.1uf op2n 1 n.c. 2 op2o 3 adip 4 n.c. 5 adin 6 n.c. 7 sa 8 sgnd 9 adp 10 dt 11 n.c. 12 smv 13 cres1 14 rl 15 n.c. 16 rcap 17 onek 18 n.c. 19 tenk 20 n.c. 21 hunk 22 n.c. 23 onem 24 n.c. 25 tenm 26 cres2 27 tstb 28 adpc1 29 adpc2 30 select 31 range 32 rel 33 hold 34 hz/duty 35 cap 36 mea4 37 mea3 38 mea2 39 mea1 40 lcdc1 41 lcdc2 42 tsta 43 vss 44 n.c. 45 agnd 46 n.c. 47 vdd 48 n.c. 49 n.c. 50 n.c. 51 vb 52 n.c. 53 cb 54 ca 55 vgg 56 n.c. 57 vdda 58 rlcd 59 n.c. 60 xin 61 xout 62 n.c. 63 txd 64 n.c. 65 seg14 66 seg13 67 seg12 68 seg11 69 seg10 70 seg9 71 seg8 72 seg7 73 seg6 74 seg5 75 seg4 76 seg3 77 seg2 78 seg1 79 com1 80 com2 81 com3 82 com4 83 entx 84 beeper 85 blout 86 rst 87 n.c. 88 refi 89 refo 90 fta 91 n.c. 92 ftb 93 ftc 94 tstc 95 op1n 96 n.c. 97 op1o 98 n.c. 99 op2p 100 fs9721_lp3 ic c7 27nf s14 rs232 vss vdd vgg vdda agnd battery negative terminal and ic negative power input ic analog power about 3.9v battery positive terminal and ic po sitive po wer input analog comm on about vdd/2 vdd charge pump vo ltage about 2*vdd diagram 6 100 pin common use circuitry
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 16/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 b 78 pin dice ic lcd bp1 buzzer r1 100k vdd r10 500k r8 40k vr1 vr10k r6 20k r7 10k r9 90k c11 4.7uf vr2 vr2k r13 28.5k r12 22k r11 100k r14 22k d1 1n914 d2 1n914 r15 100k ua/ma com 10a v/ohm/diode/cap r18 100k r19 900k j3 dcmv j2 amp r16 9.99 r17 990 r28 0.01 j7 ua j1 ma r20 100k r21 57.4k r22 1k r23 10k r24 101.01k r25 1.111m j4 dcv/acv r26 10m j5 ohm/cap/diode j6 hz j8 hz c15 10uf r29 1m s5 hz/duty s6 hold s7 rel s8 range s9 select c4 10uf c5 10uf s1 bt1 battery r2 1m xtal 4m hz r3 200k c1 10uf c3 10uf r4 100k c2 10uf adp adp blout adp2 ptc 1k c9 27nf c12 27nf c8 0.47uf c10 0.47uf ohm cap diode c13 27nf c6 10nf s2 reset r27 100k c14 47nf d3 r30 1k vdd 1 6 2 7 3 8 4 9 5 d4 r5 220 s3 s4 s10 s11 s12 s13 s15 s16 r31 10k c16 0.1uf op2n 1 op2o 2 adip 3 adin 4 sa 5 sgnd 6 adp 7 dt 8 smv 9 cres1 10 rl 11 rcap 13 onek 14 tenk 15 hunk 16 onem 17 tenm 18 cres2 19 tstb 20 adpc1 21 adpc2 22 select 23 range 24 rel 25 hold 26 hz/duty 27 cap 28 mea4 29 mea3 30 mea2 31 mea1 32 lcdc1 33 lcdc2 34 tsta 35 vss 36 agnd 37 vdd 38 vb 39 cb 40 ca 41 vgg 42 vdda 43 rlcd 44 xin 45 xout 46 txd 47 seg14 48 seg13 49 seg12 50 seg11 51 seg10 52 seg9 53 seg8 54 seg7 55 seg6 56 seg5 57 seg4 58 seg3 59 seg2 60 seg1 61 com1 62 com2 63 com3 64 com4 65 entx 66 beeper 67 blout 68 rst 69 refi 70 refo 71 fta 72 ftb 73 ftc 74 tstc 75 op1n 76 op1o 77 op2p 78 fs9721_lp3 nc 12 ic c7 27nf s14 rs232 vss vdd vgg vdda agnd battery negative terminal and ic negative power input ic analog power about 3.9v battery positive terminal and ic po sitive po wer input analog comm on about vdd/2 vdd charge pump vo ltage about 2*vdd diagram 7 78 pin common use circuitry
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 17/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.2 fs9721_lp3 technical description and the relationship of its components network current mode /10 r19:r18=9:1 tstb open current mode 10 r9:r7=9:1 tstb connect to vss ac measurement r13+vr2 r12=r14 voltage reference r8,r6, vr1 dc 400mv r26 no no no yes dc 4v r25/(r26+r25)=1/10 no no no yes dc 40v r24/(r26+r24)=1/100 no no no yes dc 400v r23/(r26+r23)=1/1000 no no no yes dc 1000v r22/(r26+r22)=1/10000 no no no yes ac 400mv r25/(r26+r25)=1/10, r9:r7=9:1 no no yes yes ac 4v r25/(r26+r25)=1/10 no no yes yes ac 40v r24/(r26+r24)=1/100 no no yes yes ac 400v r23/(r26+r23)=1/1000 no no yes yes ac 1000v r22/(r26+r22)=1/10000 no no yes yes r 400 r26//r22=1k no no no no r 4k r26//r22=1k no no no no r 40k r26//r23=10k no no no no r 400k r26//r24=100k no no no no r 4m r26//r25=1m no no no no r 40m r26=10m no no no no dc 400 a r17+r16+r28=1k ? 100 ? no yes no yes dc 4000 a r17+r16+r28=1k ? 100 ? yes no no yes dc 40ma r16+r28=10 ? 1 ? no yes no yes dc 400ma r16+r28=10 ? 1 ? yes no no yes dc 10a r28=0.01 no yes no yes ac 400 a r17+r16+r28=1k ? 100 ? no yes yes yes ac 4000 a r17+r16+r28=1k ? 100 ? yes no yes yes ac 40ma r16+r28=10 ? 1 ? no yes yes yes ac 400ma r16+r28=10 ? 1 ? yes no yes yes ac 10a r28=0.01 no yes yes yes cap r21 no no no no diode no no no yes
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 18/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.3 fs9721_lp3 (diagram 6, diagram 7) components list no. spec. no. spec. no. spec. no. spec. no. spec. r1 100k r13 28.5k r25 1.111m c7 27nf d3 send r2 1m r14 22k r26 10.000m c8 0.47f d4 receive r3 200k r15 100k r27 100k c9 27nf vr1 10k r4 100k r16 9.99 r28 0.01 c10 0.47f vr2 2k r5 220 r17 990 r29 1m c11 4.7nf lcd lcd r6 20k r18 100k r30 1k c12 27nf xtal 4mhz r7 10k r19 900k c1 10 f c13 27nf ic fs9721_lp 3 r8 40k r20 100k c2 10 f c14 47nf battery 1.5v 2 r9 90k r21 57.4k c3 10 f c15 10f bp1 buzzer r10 500k r22 1.001k c4 10 f c16 0.1f ptc 1k r11 100k r23 10.010k c5 10 f d1 1n914 r12 22k r24 101.010k c6 10nf d2 1n914 note: the technical instructions such as the accuracy, duty and press-proof of resistance and capacitance components are not marked in the common use circuitry and the components list, they depends on users? actual needs when designing the products. 15.4 power system c1 10uf c3 10uf c2 10uf c4 10uf c5 10uf refo vdda vb vgg ca cb vdd agnd vss 3v fs9721_lp3 r4 100k rlcd r3 200k c16 0.1uf refi r8 40k r6 20k vr1 diagram 8 power circuit 2*vdd 3.9v 1.2v 0.4v 1.5v 1.5v vgg vdda refo refi vdd agnd vss fs9721_lp3 rlcd 3v diagram 9 relative voltage for each point vb is the ic internal bias current input. the increase of r4 will decrease ic internal current consumption, but insufficient bias current will influence ac measurement input range. agnd is the analog ground connection. its potential is equal to the middle point of battery voltage. the potential of the point is generated by ic internal voltage that cannot connect to the middle point of battery. c4 and c5 are the bypass capacitances in one hand, and in the other hand to make agnd be regulated to vdd and vss. c2 is power pump capacitance. ic makes vdd go through c2 to charge/discharge so as to raise vgg up to approxim ate double.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 19/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 vdda is t he output voltage after regulating vgg in the ic that is about 3.9v relative to vss. refo is the ic internal bandgap power that is about 1.2v relative to agnd, and has the stability of 100ppm/ . 15.5 power supply circuit according to different application of users, the supply methods are different. in some measurements, all operating amplifier, hale components and so on sensors require larger voltage so that it is difficult to supply by 3v. if so, the following supply methods are recommended: 10uf 10uf 3v vdd agnd vss fs9721_lp3 diagram 10 3v power supply 1uf 1uf dc-to-dc 10uf 4.5~9v v+ v- vdd agnd vss fs9721_lp3 diagram 11 4.5v ? 9v power supply 1uf 1uf 6v~12v 2v~2.4v 2v~2.4v vdd agnd vss fs9721_lp3 v- v+ diagram 12 6v ? 12v power supply njm79l03a out in in4148 in4148 9v~12v 10uf 10uf vdd agnd vss fs9721_lp3 v+ v- diagram 13 9v ? 12v power supply 15.6 base power r8 40k vr1 10k refi refo fs9721_lp3 r6 20k diagram 14 utility of internal base power
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 20/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 20k 20k 15k vgg icl8069a refi fs9721_lp3 diagram 15 utility of external base power 15.7 trigger reset circuit rst fs9721_lp3 vdd c6 10nf s2 reset r1 100k diagram 16 reset circuit 15.8 quartz oscillation circuit xtal xout xin cx1 cx2 fs9721_lp3 r2 diagram 17 quartz oscillation circuit in the diagram, r2 is the reviser to offer the statical working point, cx2 is the frequency fine adjustment, and cx1 is the temperature offset. in the unexacting situation, cx1 and cx2 can be unused. 15.9 buzzer driver circuit buzzer bj1 beeper vdd fs9721_lp3 51 10k diagram 18 low resistance buzzer connection buzzer bj1 beeper fs9721_lp3 10k 3k vdd diagram 19 high resistance buzzer connection
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 21/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.10 mode switch and function control circuit diagram 20 mode switch and function control circuit s3~s4, s10~s13 and s15~s16 are the mode switches. for the functions of s3~s4 , please refer to 10.3. for the functions of s15~s16 , please refer to 10.4. for the functions of s10~s13 , please refer to 10.1. s14 is rs232 output control switch. s2 and s5~s9 are the function select switches which are the trigger switches. for their functions, please refer to ?keys definition? and ?other functions?. in practice application, to use which switches or keys depend on the actual situation. 15.11 ac rectifier circuit diagram 21 is fs9721_lp3 average rectification circuitry. in the circuitry, ac signals enters ic through r26, then divided the voltage by r26, r25, r24, r23 and r22. after voltage division, the ac signals come out from op1o pin, and enter the ic via ad ip pin and adin pin after rectifying. vr2 can adjust the size of the signal to be the calibration of ac measurement. 400mv mode is amplified 10 times by op. diagram 22 is the peak value rectification circuitry. diagram 23 is the true valid value rectification circuitry. user can decide which rectification circuitry to use according to the demand of oneself.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 22/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 + _ + _ + _ r9 90k r7 10k c11 4.7uf r13 28.5k vr2 vr2k r12 22k r14 22k c8 0.47uf c10 0.47uf d1 d2 r11 100k r15 100k c12 27nf c9 27nf to digit part inl inh to adc v- to adc v+ adip adin op2o op2n op1o op1n to adc v+ fs9721_lp3 op2p diagram 21 average rectification circuitry + _ + _ + _ r9 90k r7 10k c11 4.7uf r13 28.5k vr2 r12 22k r14 22k d1 d2 c12 27nf to digit part inl inh to adc v- to adc v+ adip adin op2o op2n op1o op1n to adc v+ fs9721_lp3 op2p diagram 22 peak rectification circuitry
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 23/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 + _ input ampcifier 8k 8k 47uf 100k 0.1uf 10uf 28k 1k 1uf 1uf 1 2 3 45 6 7 8 full wave rectigier rms core bias section vss adin adip op1o vdd ad737 fs9721_lp3 10uf 10uf njm79l03a 9v in out 1n4148x2 diagram 23 true valid value rectification circuitry 15.12 voltage measurement vr1 10k ptc 1k refi refo tenm onem hunk tenk onek sgnd fs9721_lp3 com v v r8 40k r620k r25 1.111m r24 101.01k r23 10k r22 1k r26 10m r31 10k diagram 24 voltage measurement when doing the voltage measurement, the measuring voltage is input from resistance r26 and dcmv is not divided but enter ic directly; the voltages of 4v, 40v, 400v, 1000v modes are divided by r25, r24, r23, r22 and r26 to gain 1/10, 1/100, 1/1000, 1/10000 input voltages, then enter ic. to adjust the resistance value of vr1 can do the calibration of the measurement. the voltage division diagram of voltage measurement is as below: vout=0.1v vout=0.1v vout=0.1v vout=0.1v vin=1v vin=10v vin=100v vin=1000v r26 10m r26 10m r26 10m r26 10m r25 1.111m r24 101.01k r23 10k r22 1k diagram 25 voltage division circuitry the formula of voltage division is: vout=vin x [rs/ r26+rs ] rs is r25, r24, r23 or r22. therefore, the accuracy of r22, r23, r24, r25 and r26 decides the accuracy of the measurement. acmv voltage enters ic through r26 and is divided by r25 and r26 to get 1/10 voltage, then is amplified 10 times to fulfill the measurement, so the accuracy of r9 and r7 also determines the measuring accuracy of acmv voltage.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 24/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.13 current measurement the difference between current measurement a and current measurement b is as follow: current measurement a current measurement b tstb open tstb connects to vss mode mode measurement sampling resistance measurement sampling resistance a 10a 0.01 10a 4a 0.01 ma 400ma 40ma 10 400ma 40ma 1 a 4000 a 400 a 1k 4000 a 400 a 100 max. voltage reduction 4v 0.4v j7 j1 ua/ma 10a fs9721_lp3 0.5a/250v 10a/250v com smv sa r17 990 r16 9.99 r28 0.01 sgnd r31 10k tstb r19 900k dt r18 100k diagram 26 current measurement a in tstb open mode, the current signal enters ic from r19. when doing the current measurement, the sampling resistance of a mode is r16+r17 +r28, the sampling resistance of ma mode is r16+r28, and the sampling resistance of 10a mode is r28. they are measured respectively through the mode switch. when measuring a, j1 is open and j7 is close; when measuring ma, j7 is open and j1 is close; the large current enters directly via 10a port. the maximum reduced voltage for a, ma and 10a modes is 4v. these voltages are input voltage comparator to compare. if the voltage is smaller than 400mv, it will be sent to 10 times ampifier to amplify, then sent to a/d converter; if the voltage is larger than 400mv, the system will work the auto-ranging signal, and jump up one mode under the control of microprocessor and send the current signal directly to the a/d converter. the accuracy of resistance r16, r17, r28, r18 and r19 affects the accuracy of the current measurement. j7 j1 ua/ma 10a fs9721_lp3 0.5a/250v 10a/250v com sa agnd r17 99 r16 0.99 r28 0.01 sgnd tstb diagram 27 current measurement b in tstb connecting to vss mode, the current signal enters ic from sa. when doing the current measurement, the sampling resistance of a mode is r16+r17+r28, the sampling resistance of ma mode is r16+r28, and the sampling resistance of 10a mode is r28. they are measured respectively through the mode switch. when measuring a, j1 is open and j7 is close; when measuring ma, j7 is open and j1 is close; the large current enters directly via 10a port. the maximum reduced voltage for a, ma and 10a modes is 4v. these voltages are input voltage comparator to compare. if the voltage is smaller than 40mv, it will be sent to 10 times ampifier to amplify, then sent to a/d converter; if the voltage is larger than 40mv, the system will work the auto-ranging signal, and jump up one mode under the control of microprocessor and send the current signal directly to the a/d converter . the accuracy of resistance r16, r17, r28, r7 and r19 affects the accuracy of the current measurement.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 25/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.14 resistance measurement j5 j3 ohm com tenm onem hunk tenk onek smv sgnd fs9721_lp3 agnd ptc 1k cres1 c13 27nf r19 900k r22 1k r23 10k r24 101.01k r26 10m r25 1.111m rx r20 100k rl r31 10k diagram 28 resistance measurement resistance measurement refers to the standard resistance, and then takes a comparison between measuring resistance and standard resistance to get the measuring resistance value. the standard resistance of 40m mode is 10m (r26). the standard resistance of other modes are r26 to parallel respectively with r25, r24, r23 and r22 to get 1m , 100k , 10k , 1k resistance. when doing resistance measurement, internal ic will generate 0.4v voltage (relative to agnd), and the voltage is output respectively through resistance r26, r25, r24, r23 and r22 to the measuring resistance to do the comapring measurement. r20 connects to rl, which is the negative input of the voltage reference that is gotten by the standard resistance. j3 and j5 are mode switches. when doing resistance measurement, j3 and j5 are close. c13 is the wave filter capacitance of measuring point in resistance measurement. 15.15 diode test tenm onek smv dt sgnd fs9721_lp3 j5 j3 vd diode com ptc 1k r26 10m r18 100k r19 900k r22 1k r31 10k diagram 29 diode measurement diode test generates 1.5v voltage from internal ic and outputs it through r22, then adds it to the positive of diode through ptc. the positive voltage reduction vd generated by diode is approx. 0.5v-0.7v. vd is divided by r20 and r19 to be 1/10 vd, then is amplified 10 times by internal op and is delivered to a/d before displaying the vd value. j3 and j5 are mode switches. when doing diode measurement, j3 and j5 are close. 15.16 open-short test j5 j3 fs9721_lp3 tenm onek smv sgnd agnd ptc 1k continuity com r26 10m r22 1k r19 900k rx r31 10k diagram 30 open-short tests open-short test is proceeded in 400 resistance mode. 0.4v voltage (relative to agnd) is generated by internal ic and is output through r22, then is added to open-short measuring point through ptc. j3 and j5 are mode switches that are close during doing the open-short test. rx gets voltage v rx , and enters ic through r19. if rx is smaller than 50 , the buzzer will sound.
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 26/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 15.17 capacitance measurement r21 57.4k r19 900k rcap smv sgnd ptc 1k cap com cx fs9721_lp3 j3 j5 do- do+ do- do+ cmp do+ do- + - vdd agnd 3/4vdd 1/4vdd r31 10k input typical waveforms 3/4vdd 1/4vdd vdd tdo diagram 31 capacitance measurement capacitance measurement is to charge/discharge the measuring capacitance through r21 to form a oscillation, then calculate the cycle of oscillation to get the capacitance value. to adjust r21 can calibrate the value in capacitance measurement. j3 and j5 are mode switches. when doing capacitance measurement, j3 and j5 are close. 15.18 frequency measurement adp sgnd r29 1m com hz fs9721_lp3 r27 100k j6 j8 ptc 1k r31 10k c15 10uf diagram 32 frequency measurement
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 27/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 16. package outline diagram 33 package outline
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 28/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17. demo board 17.1 demo board schematic 1 2 34 a b c d 4 3 2 1 d c b a title number revision size letter date: 25-feb-2002 sheet of file: d:\schematic\fs9711_6\9721v1-6.sch drawn by: com2 81 com3 82 com4 83 entx 84 beeper 85 blout 86 rst 87 n.c. 88 refi 89 refo 90 fta 91 n.c. 92 ftb 93 ftc 94 tstc 95 opin 96 n.c. 97 op1o 98 n.c. 99 op2p 100 op2n 1 n.c. 2 op2o 3 adip 4 n.c. 5 adin 6 n.c. 7 sa 8 sgnd 9 adp 10 dt 11 n.c. 12 smv 13 cres1 14 rl 15 n.c. 16 rcap 17 onek 18 n.c. 19 tenk 20 n.c. 21 hunk 22 n.c. 23 onem 24 n.c. 25 tenm 26 cres2 27 tstb 28 adpc1 29 adpc2 30 select 31 range 32 rel 33 hz/duty 34 hold 35 cap 36 mea4 37 mea3 38 mea2 39 mea1 40 lcdc1 41 lcdc2 42 tsta 43 vss 44 n.c. 45 agnd 46 n.c. 47 vdd 48 n.c. 49 n.c. 50 n.c. 51 vb 52 n.c. 53 cb 54 ca 55 vgg 56 n.c. 57 vdda 58 rlcd 59 n.c. 60 xin 61 xout 62 n.c. 63 txd 64 n.c. 65 seg14 66 seg13 67 seg12 68 seg11 69 seg10 70 seg9 71 seg8 72 seg7 73 seg6 74 seg5 75 seg4 76 seg3 77 seg2 78 seg1 79 com1 80 fs9721_lp3 u1 fs9711g/i u2 4m hz r1 1m r4 200k c1 10uf c2 10uf r5 100k 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 sw1 sw dip-8 s1 sw-pb s2 sw-pb s3 sw-pb s4 sw-pb s5 sw-pb 1 2 4 3 sw2 sw dip-2 + c4 10uf vdd c5 47nf r11 10m r12 1k r13 1.111m r14 101.0k r15 10k r18 1k vr1 vr30k r6 100k c6 27nf r19 900k r7 100k r16 10k j1 ohm/cap/diode j2 dcv/acv j3 dcmv/ohm/cap/diode com1 u5 b1 buzzer r8 100k c10 10nf vdd r20 40k r22 20k vr2 vr10k r23 500k c7 27nf r24 90k r17 10k vr3 vr2k r25 28.5k r26 22k r27 22k d1 1n914 d2 1n914 r9 100k r10 100k c8 27nf c9 27nf blout adp txd fs9721 design kit seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 seg9 seg10 seg11 seg12 seg13 seg14 com2 com3 com4 com5 c3 10uf entx entx r21 40k u3 sw-spdt ub1 3v battery adp/adp1 u6 r3 1m j4 hz adp2 vr4 40k 1 2 l1 dios rso1 3k vdd txd rs232 enable ac gain cap gain 1 2 l2 dior 6 7 8 9 1 2 3 4 5 port1 db9m 1 2 4 3 sw3 sw dip-2 u4 v/ohm/diode/cap c11 10uf r28 180 1 2 l3 led vref temp gain r29 220 s6 sw-pb hz/duty hold rel range select blctr select j5 hfe input j6 adp input adp j7 adp2 input adp2 j8 jmp1 j9 temp1 j10 temp2 + c12 10uf tstb tstb adp2 u7 + c13 10uf r2 0.1uf c? 0.47uf c? 0.47uf diagram 34 demo board schematic
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 29/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17.2 fs9721_lpx demo board location rs232 port power sw sw dip-8 s1 s2 s3 s4 s5 s6 vr4 50k vr2 50k vr3 2k j5 j6 j7 j8 j1 j2 j3 j4 u6 u5 u4 hfe input adp input adp2 input jmp1 hz dcmv/ohm/cap/diode dcv/acv vr1 50k dcmv/ohm/cap/diode ic fs9721_lp1 ic fs9721_lp3 u7 adp2 adp/adp1 com1 v/diode/ohm/cap temp1 temp2 j9 j10 lcd module 8 1 2 3 4 5 6 7 1 2 sw3 dip-2 12 sw2 dip-2 * fs9721_lp3 use * fs9721_lp1 no use temp gain vref ac gain cap gain * fs9721b/q100 use rs232 on/off hz/duty hold rel range select bl_ctr (lp3 / q100 use) mea4 mea3 mea2 mea1 cap lcdc1 lcdc2 tstb adpc1 adpc2 ic fs9721b/q100 diagram 35 demo board schematic
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 30/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17.2.1 u4: input voltage, resistance, diode and capacitance. 17.2.2 u5: analog signal to ground. 17.2.3 u6: input voltage (mv), hz and duty cycle. 17.2.4 u7: current mode measuring terminal. (input voltage) 17.2.5 j1~j10: please refer to ?fs9721_lp3 measurement mode and jumper setup?. 17.2.6 s1~s5: please refer to ?fs9721_lp3 demo board schematic?. 17.2.7 sw-dip8: (if switch sw to on, it is low level) cap function mode (meas ? 1101) 1 ohm / diode /cont. 0 ohm / diode /cont. / cap mea4 mea3 mea2 mea1 function mode 1 1 1 1 dc/ac voltage (including dc mv mode) 1 1 0 1 ohm/diode/cont./cap 1 0 1 0 dc voltage (no dc mv mode) 1 0 0 1 ac voltage 1 0 1 1 dc mvmode 1 0 0 0 10a 1 1 1 0 ma 1 1 0 0 a 0 1 1 1 capacitance mode 0 1 0 1 hz/duty 0 0 d1 d0 adp 0 1 1 0 adp 0 1 0 0 aca(400.0a, 4000a) 17.2.8 lcdc1 lcdc2 can control lcd symbol. it shows as below in demo board: lcdc1 lcdc2 lcd symbol 0 0 t1 1 0 hfe 0 1 1 1 t2 tstb function mode (meas = 1000) (meas = 1110) (meas = 1100) 1 input voltage (400mv~4v) 0 input voltage (40mv~400mv) 17.2.9 to input (400mv~4v), the conditions are (tstb=1) (j3,j8 short) ex (meas=1100) (input v/diode/ohm/cap,com) input voltage lcd display( a) 40mv 40.0 400mv 0400 4.00v 4000
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 31/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 17.2.10 to input (40mv~400mv) , the conditions are (tstb=0) (j3,j8 open) ex (meas=1100) (input adp2,com) input voltage lcd display ( a) 4.0mv 40.0 40.0mv 0400 400.0mv 4000 17.2.11 w2-dip2: (if switch sw to on, it is low level) adpc1 function mode (meas ? 0 0 d1 d0) 1 input (40mv~400mv) 0 input (4mv~40mv) adpc2 function mode (meas ? 0 0 d1 d0) 1 dc measurement 0 ac measurement 17.2.12 w3-dip2: (if switch sw to on, it is low level) pin2 don?t care 1 pin function 1 pin = 1 rs232 mode off 1 pin = 0 rs232 mode on 17.2.13 fs9721_lp3 measurement mode select: mea4 mea3 mea2 mea1 mode select (1 ? 0 ? 1) hz/duty (1 ? 0 ? 1) 1 1 1 1 dc/ac voltage (including dc mv mode) dc / ac switch hz/duty/voltage switch 1 1 0 1 ohm/diode/cont./cap cap=1: ohm/diode/cont. switch cap=0: ohm/diode/cont./cap switch 1 0 1 0 dc voltage (no dc mv voltage mode) hz/duty/voltage switch 1 0 0 1 ac voltage hz/duty/voltage switch 1 0 1 1 dc mvmode hz/duty/current switch 1 0 0 0 10a 4 ac/dc switch hz/duty/ current switch 1 1 1 0 ma 4 ac/dc switch hz/duty/ current switch 1 1 0 0 a 4 ac/dc switch
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 32/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 0 1 1 1 capacitance mode 0 1 0 1 hz/duty cycle 1 hz/duty 0 0 d1 d0 adp 2 0 1 1 0 adp 3 0 1 0 0 aca (400.0,4000) 17.2.13.1 hz and duty cycle measurements take adp measuring path as input terminal. 17.2.13.2 adp is single adc positive input point. the range of measuring voltage is 400mv. lcd decimal location is decided by d1 and d0. 11 means no decimal, 01 means 40.00, 10 means 400.0 and 00 means 4.000 that display with one unit. 17.2.13.3 adp can be 400.0mv/40.00mv autoranging to display respectively 4000 and 400.0. 17.2.13.4 when tstb=1, the current mode is as fs9711_lp1 to input 400mv/4v; when tstb=0, the current mode is as fs9711b to input 40mv/400mv. 17.2.14 fs9721_lp3 measurement mode and jumper setup: (1 pin = tstb open) mea4 mea3 mea2 mea1 mode jumper input 1 1 1 1 dc/ac voltage (including dc mv mode) j2 v/diode/ohm/cap, com 1 1 0 1 ohm/diode/cont./cap j1,j3 v/diode/ohm/cap, com 1 0 1 0 dc voltage (no dc mv voltage mode) j2 v/diode/ohm/cap, com 1 0 0 1 ac voltage j2 v/diode/ohm/cap, com 1 0 1 1 dc mv mode j1 v/diode/ohm/cap, com 1 0 0 0 10a 4 j3,j8 v/diode/ohm/cap, com 1 1 1 0 ma 4 j3,j8 v/diode/ohm/cap, com 1 1 0 0 a 4 j3,j8 v/diode/ohm/cap, com 0 1 1 1 capacitance mode j1,j3 v/diode/ohm/cap, com 0 1 0 1 hz/ duty cycle 1 j4, j6 adp/adp1,com 0 0 d1 d0 adp 2 j6 adp/adp1, com 0 1 1 0 adp 3 j6 adp/adp1, com 0 1 0 0 aca (400.0,4000) j3,j8 v/diode/ohm/cap, com 18. ordering information product number description package type fs9721_lp3 die form (78 pins) fs9721_lp3 100-pin qfp (not pb free package) fs9721_lp3-pce pb free package part number. 100-pin qfp (pb free package)
fs9721_lp3 4,000 counts auto range dmm ic. semiconductor corporation f ort u n e ?w??? fortune semiconductor corp. tel : +886-2-2809-4742 33/33 fs9721_lp3-ds-18_en rev. 1.8 http://www.fsc.com.tw fax: +886-2-2809-4874 19. revision history ver. date page description 1.5 2004/04/09 3-4, 32 1. change file name format from ?fs9721_lp3 data sheet_v1.4.doc? to ?fs9721_lp3_datasheet_v15.doc?. 2. change page top and bottom space format. 3. add numbers on features and application field on page 3 and 4. 4. add cr-004 on the bottom page space. 5. add ordering information. 8 1. revise the diagram 3 78pin dice. 1.6 2004/11/18 33 2. add revision history on the last page of the data sheet. 8 1. diagram 3 78pin dice in ver. 1.6 is not correct. revise it to the right one. 1.7 2005/7/11 32 1. revise ordering information. add pb-free package part number. 4 1. delete 5.120nf capacitance measurement mode. 2. correct frequency measurement mode 5000 counts for 5120counts. 10 1. in the ?9.technical specification?, correct capacitance measurement mode 4000 counts for 5120counts , and delete 5.120nf measurement mode. 12,30 1. in the 10.3, lcdc1 and lcdc2=10 display com2 and seg14 (hfe). lcdc1 and lcdc2=01 display com3 and seg14 ( ). 19 1. delete diagram 11 ?4.5v power supply ?and diagram 12 ?6.0v power supply?,and modify serial number after them. 26 1. in the 15.17 capacitance measurement ,delete the segment?in actual application ?. 1.8 2005/8/9 30-32 1. in the 17.2.7, 17.2.13 and 17.2.14, correct meas=1111 ac/dc voltage for dc/ac voltage .correct meas=1011 dcma mode for dcmv mode.

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