View NJU9214_316738.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

NJU9214
PRELIMINARY
4 3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI
s GENERAL DESCRIPTION
The NJU9214 is a 4 3/4 digits single chip digital multimeter LSI with 42 segments bargraph display. The NJU9214 realizes high precision of 40,000 counts measurement by the NJRC original dual-slope A to D converter and realizes also quick response bargragh display and auto-ranging by another high speed dual-slope A to D converter. The input attenuator part is simplified because the resistor for resistance measurement is applied for voltage bleeder resistor. Furthermore, the NJU9214 realizes root-mean-square measurement for AC voltage and current by connecting a External RMS-DC Converter, and Data output by the on chip RS-232C interface circuit. The NJU9214 is suitable for high precision and high performance multimeter.
PACKAGE OUTLINE
NJU9214FG1
s FEATURES
q q q q q q q q q q q q q q q q q q q q 4 3/4 Digit Display ( Available for UP to 39,999 Display ) 42 Segments Quick Response Bargraph Display NJRC Original Dual-Slope A to D Converter ( 40,000Counts ) High Speed Dual-Slope A to D Converter ( 400Counts ) Quick Response Auto-Ranging ( 20times/sec ) Frequency / Capacitance / Tachometer / Adapter Measurement Root-Mean-Square Measurement by connecting a External RMS-DC Converter External Relay Driving Data Memory / Data Hold / Relative Display / MAX, MIN Display Power-on Initializing Auto Power-off Buttery Life Detector Rotary / Push SW Mode Selection 1/4 Duty LCD Display Driver Piezo Buzzer Direct Driving RS-232C Interface External Reference Input required Low Operating Current C-MOS Technology Package Outline QFP100-G1
NJU9214
s BLOCK DIAGRAM
REGURATOR
REFERENCE
VREF1
VREF2
EXTERNAL RESISTOR and SWITCHS
VDDA AGND VSSA +5.0V 0V -5.0V IVSL, IVSH VI, VR2 to 7, OVH, OVX ADP
SGND
VDDD 5.0V
VSSD 0V
VREF3
A
SWITCH NETWORK
DCV, ACV, , , ,CAP, DCmA, ACmA, FRQ, rpm
REFERENCE BUFFER
BATT LOW DETECTOR
COM
HIGH SPEED A/D section
HIGH RESOLUTION A/D SECTION
FRQ BUFFER
CAPACITOR A/D SECTION
ANALOG SECTION
CONVERTER
RMS-DC
RMSIN
SWITCH NETWORK I/F
HIGH SPEED A/D I/F
HIGH RESOLUTION A/D
I/F
RD1 to 4
RELAY CONTROLER
SWITCH NETWORK
CONTROLLER
HIGH SPEED A/D CONTROLLER
HIGH RESOLUTION A/D CONTROLLER
POWER ON INITIALIZE 4bitBUS
DIGITAL SECTION
FC1 to 4, KI1 to 5
KEY
CONTROLLER
RS232C
CONTROLLER
BUZZER
CONTROLLER
4bit CPU
LCD CONTROLER TEST
LCD DRIVER and
OSC
TXD DTR DSR
TRX TXS RST PON
POWER
BZ
COM1 to 4 SEG1 to 28
T1 to T3
XT1
XT2
KEY MATRIX
RS232C DRIVER
BUZZER
LCD
NJU9214
s PIN CONFIGURATION
DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21
60 55
BUF CL2 CH2 VREF3 VREF2 VREF1 CH1 CL1 INT1 INT2 SGND2 SGND1 AGND IVSH IVSL ADP OVX OVH VR7 VR6 VR5 VR4 VR3 VR2 V1
75
70
65
SEG20 SEG19 SEG18 SEG17
BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD
CIF2 CIF1
50
80 45
85 40
NJU9214FG1
90 35
95 30
100 1
5
10
15
20
25
SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM4 COM3 CMO2 COM1 T3 T2 T1 RST PON
ACOUT VDDA RMSIN
VDDD RD1 RD2 RD3 RD4 TXS TRX
RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4
s TERMINAL DESCRIPTION
No. 1 2 3 4 5 to 8 9 10 11 12 13 to 16 17 to 20 21 to 25
SYMBOL ACOUT VDDA RMSIN VDDD RD1 to RD4 TXS TRX KMS RMS RC0 to RC3 FC1 to FC4 KI1 to KI5
I/O Out - In - Out In In In In In I/O In
FUNCTION Attenuator output terminal ( used at ACA, ACmA, FRQ, rpm ) Analog VDD ( VDDA = 5.0 0.25V ) RMS-Voltage Input Terminal Digital VDD ( VDDD = 5.0 0.25V ) Relay Driving Terminal RS232C Output-Rate Select Terminal L ; 9600bps H ; 2400bps RS232C Function Select Terminal Key Mode Select Terminal Range Control Mode Select Terminal Range Select Terminal with Input Pull-up Resistance ( 300k ) Function Select Terminal with Input Pull-up Resistance ( 300k ) Optional Function Control Terminal with Input Pull-up Resistance ( 300k )
KMS RMS RC0 RC1 RC2
KI5
NJU9214
No. 26 27 28 to 30 31 to 34 35 to 62 63 64 65 66 67 68 69 70 71 72 73 74, 75 76 77, 78 79 to 81 82, 83 84, 85 86, 87 88 89 90 91 92 93 94 95 96 97 98 99 100 SYMBOL PON RST T1 to T3 COM1 to COM4 SEG1 to SEG28 DSR DTR TXD BZ XT2 XT1 VDSP VSSD SLEEP VSSA BLD CIF2, CIF1 BUF CL2, CH2 VREF3 to VREF1 CH1, CL1 INT1, INT2 SGND2, SGND1 AGND IVSH IVSL ADP OVX OVH VR7 VR6 VR5 VR4 VR3 VR2 VI I/O In In In Out Out In Out Out Out Out In I/O Out In I/O Out I/O In I/O I/O In In In In In Out I/O I/O I/O I/O I/O I/O In FUNCTION Auto Power-off Mode Release Terminal with Input Pull-up Resistance ( 300k ) System Reset Terminal with Input Pull-up Resistance ( 10k ) Test Terminal with Input Pull-up Resistance ( 300k ) LCD Common Terminal LCD Segment Terminal RS232C Data Set Ready Terminal RS232C Data-Terminal Terminal RS232C Data Output Terminal Piezo Buzzer Driving Terminal Crystal oscillation Inverter ( Output ) Crystal oscillation Inverter ( Input ) LCD driving voltage I/O Terminal Opened : VDSP=(VDDD-VSSD) X 3/5 Connected to VSSD : VDSP=(VDDD-VSSD) Digital VSS VSSD=0.0V Auto Power-off signal Terminal ( Power-off : " H " Level ) Analog VSS VSSA = -5.0V Buttery Life Detector Terminal, Detection: BLD < about 4.0V High-speed integration capacitor connecting Terminal High-speed integrator buffer output Terminal High-speed integrator reference capacitor connecting Terminal VREF1 : High-accurate integrator reference voltage input Terminal VREF2 : High-speed integrator reference voltage input Terminal VREF3 : Capacitance measurement integrator reference voltage input Terminal High-accurate integrator Reference capacitor connecting Terminal CL1 ; " - " , CH1 ; " + " High-accurate integrator capacitor connecting Terminal Analog sensing Terminal Analog GND Terminal Current measurement ( A ) sensing Terminal Current measurement ( mA ) sensing Terminal Adapter input Terminal Sensing Terminal ( Resistance, Continuity, Capacitance ) Voltage supply Terminal (Resistance, Continuity, Diode, Capacitance) Bleeder Resistance Terminal for 4V, 40V range Bleeder Resistance Terminal for 400 range Bleeder Resistance Terminal for 4000V, 4k range Bleeder Resistance Terminal for 400V, 40k range Bleeder Resistance Terminal for 40V, 400k range Bleeder Resistance Terminal for 4V, 4000k range Voltage input Terminal for 400mV range
NJU9214
s FUNCTION DESCRIPTION
(1) Measurement function Each measurement functions shown below is available with the NJU9214. MEASUREMENT FUNCTION DC/AC Voltage DC/AC Current DC/AC Current Resistance () Frequency ( f ) Capacitance( C ) Tacho (rpm) Diode ( ) Continuity( ) AD P RANGE 400mV to 4000V 4mA to 4000mA 40A 400 to 40M 100Hz to 1000kHz 4nF to 400F 6000rpm to 600Krpm Auto/Manual Auto : 4-range / Manual : 5-range Auto Manual -2 range/ Manual -4 range Fixed Auto : 6 - range / Manual : 6 - range Auto : 5 - range Auto : 6 - range / Manual : 6 - range Auto : 3 - range Fixed Fixed Fixed 1 2
3
1 400mV range ( AC / DC ) is selected in only manual range. 2 4mA-4000mA range has Auto / Manual - 2 range and Manual - 4 range mode, each mode needs its own application circuit. 3 ADP is applied for C, hfe and other measurement (1-1) Voltage ( DCV, ACV ) measurements
The divided voltages which are output from each resistance R1 to R5 shown in following table are supplied to A/D converter. In the AC measurement, after the dividing voltage, these output voltages are converted to DC Voltages with the external RMS/DC converter. This DC voltage is supplied into A/D converter. 10M resistor for input terminal may be easy to be affected by noises. Therefore 10M and peripheral circuits require some protection like shields and so on for stable display. The resistors for attenuating should be selected with a flat temperature characteristic. Especially, the resistors ( 10M, 10k, 1k ) for 400V, 4000V ranges should be selected carefully. For example, when 4,000V is input, 0.4mA ( 4,000V / 10M ) flow through 10M, and the resistor consumes power of 1.6W ( 4,000V x 0.4mA ) and the temperature of the reference resistor. After measuring at 400V, 4,000V ranges, sometimes the uncorrect value is shown on the display at 4V, 40V ranges because the value of resister as the attenuator is changed by the temperature. RANGE R1(400mV) R2(4V) R3(40V) R4(400V) R5(4000V) DIVISION RATE 1 1M / 10M 100k / 10M 10k / 10M 1k / 10M
NJU9214
(1-2) Resistance measurement ( ) As shown below, six type resistors ( 10M, 1M, 100k, 10k, 1k, 100 ) connecting VR2 to VR7 are used for reference resistors of each range. The output voltage on the measurement terminal is almost same as the voltage inputted Vref3. As shown in Application circuits ( 1 ) to ( 3 ), an input protective diode must be connected with the OVH terminal. In resistance measurement, continuity test, diode check and capacitance mode, if the NJU9214 is supplied high voltage on the OVH terminal from the external, the NJU9214 may be broken completely. In the R1 ( 400 ) range, sometimes the resistor value shows wrong display because of the influence by test leads and wiring resistances of a circuit board. In this case, it needs to adjust on the relative function using the 0 resistance. In the R6 ( 40M ) range, it may take a time to get the correct measurement value by the influence of parasitic capacitance and may not show the stable value by the noise effects. RANGE R1 ( 400 ) R2 ( 4k ) R3 ( 40k ) R4 ( 400k ) R5 ( 4000k ) R6 ( 40k ) (1-3) Continuity test( ) Refer. Resistance Value 100 1k 10k 100k 1M 10M
The input attenuator is fixed to 400 range of the resistance measurement mode. When the value is less than 40, the buzzer sounds. The output voltage on the measurement terminal is about 0.4V. If the display doesn't show 0 by resistances of lead wire when the terminals are shorted, this case requires adjustment at 0 using the relative function. (1-4) Diode check( )
The input attenuator is fixed to DC4V range. The output voltage on the OVH terminal is about 5V ( VDDA ), and it is supplied to the measurement terminal through the SW1 ( external switch or relay ). (1-5) Current ( DCmA, ACmA ) measurement
Current measurement provides the Auto - Manual 2-range mode( RMS = H ) and the Manual 4-range mode ( RMS = L ). These are changed by status of the RMS terminal. Each mode needs its own application circuit. In the Auto-manual 2-range mode, the sense terminal is IVSL terminal at the 40mA range and IVSH terminal at the 400mA range. In the Manual 4-range mode, the sense terminal is IVSL. In this mode, switching range is performed by changing the reference resistors. The SW for the reference resistor change must be operated together with the SWs connecting to ' RC1 to RC3 '. ( Refer to ( 2 - 1 - 3 ) ) (1-6) Current ( DCA, ACA ) measurement
It is fixed to the 40A range. The sense terminal is the IVSH terminal.
NJU9214
(1-7) Frequency ( f ) measurement The input voltage is divided by the attenuator, and then the attenuator output is supplied to counter through the buffer. The divided voltage is converted to DC voltage by the external RMS/DC converter, and the dividing voltage ratio of the input attenuator is changed by this DC voltage, Noises or distorted waveforms sometimes show different display against actual frequency. The frequency range is always fixed to the Auto-range mode. It is able to switch from 100Hz to 1,000kHz and the measurement cycle is 1 time a second. (1-8) RPM measurement
It is possible to measure numbers of revolution like as the revolutions of engine. The measurement is same way as the frequency measurement. The revolutions are calculated by the value of 60 times the frequency. The revolution range is always selected one of 6,000 to 600krpm automatically. The minimum input voltage ( wave amplitude ) is about 300mV and the measurement cycle is 1 time a second. (1-9) Capacitance ( C ) measurement
The constant-current charges the measured capacitor, and the charging time, while the voltage of capacitance reaches to the reference voltage, is measured and converted to the capacitance value. If the measured capacitor has any electric charges, accurate measurement is not available. Therefore the measured capacitor must be discharged before measurement. The sense terminal is the OVX terminal. (1-10) Adapter ( ADP ) measurement The voltage between the ADP terminal and the SGND is supplied to the A/D converter directly. Both of ADP terminal ( + ) and SGND terminal ( - ) are High-impedance in DC400mV range. Therefore, it is also used as differential input.
(2) Switch input Mode The lock or push type input switch is applied for function selection. The switch type is selected in both of auto and manual ranges by the RMS terminal setting. When the push type switch is selected, auto ranging is always selected. When the lock type switch is selected and the RMS terminal is GND ( L ) level, all ranges are selected by switches. But if the RMS terminal is VDD level ( H ), auto range, manual range selection and the range set are performed by a push type switch. KMS Terminal H H L RMS Terminal H L SWITCH Lock type Push type RANGE Full Auto Manual Full Auto : ( Don't Care ) Both of lock and push type application have the chattering protective function which reject the chattering less than 20ms.
NJU9214
(2-1) Lock type switch (2-1-1) Measurement function selection ( KMS = " H " ) The measurement function is set by FC1 to FC4 terminal. Excepting the following settings, all others select the DCV measurement mode. Measurement mode DCV AC V D C mA A C mA Resistance( ) Continuity ( ) Diode ( ) Capacitance ( C ) DCA ACA Frequency ( f ) rpm ADP FC1 H L H L H L H L H L H L H FC2 H H L L H H L L H H L L H FC3 H H H H L L L L H H H H L FC4 H H H H H H H H L L L L L
(2-1-2) Range setting ( Lock type & Auto-Ranging : KMS = RMS = " H " ) The range shown in below table is controlled by a switch of the RC0 terminal which must go to " L " level ( GND ) when it is pressed. When the switch is pressed once, the range is changed from Auto-range to manual-range, and its range is held. Then, the range is changed in every time by the switch operation. The range always returns to Auto-range from any kinds of range when the switch is pressed over than 1 second. 1push(>1sec) Measurement Mode DCV AC V D C mA A C mA Resistance ( ) Continuity ( ) Diode ( ) AD P DCA ACA Frequency ( f ) Tacho ( rpm ) Capacitance ( C ) Auto Manual Range up 1push(<1sec) 1push(<1sec) R2 to R5 R2 to R5 R2 to R3 R2 to R3 R1 to R6 (R5R2) (R5R2) (R3R2) (R3R2) (R6R1) Ranging control 4V to 4000V 4V to 4000V 40mA to 400mA 40mA to 400mA 400 to 40M Default Range 4V 4V 40mA 40mA 400 400 4V 400mV 40A 40A 100Hz 6000rpm 4nF
HOLD
RiRi+1
FIXED
R1 to R5 R1 to R3 R1 to R6 100Hz to 999.9kHz 6000rpm to 600krpm 4nF to 400uF
Auto-range HOLD RiRi+1 (R6R1)
NJU9214
(Note) Frequency measurement and revolution measurement are always set to the Auto-Range. Ranges of continuity test ( default range. In the ADP measurement, three units are displayed by setting of RC1 to RC3 terminals. The R1 to R6 of above range control table are set as a range corresponding to below table. RANGE R1 R2 R3 R4 R5 R6 DCV 400mV 4V 40V 400V 4000V - ACV 400mV 4V 40V 400V 4000V - DCmA - 40mA 400mA - - - ACmA - 40mA 400mA - - - 400 4k 40k 400k 4000k 40M f 100Hz 1000Hz 10kHz 100kHz 1000kHz - rpm 6000 60000 600k - - - C 4nF 40nF 400nF 4uF 40uF 400uF ), diode check ( ), ADP, DCA and ACA measurement are always fixed to the default ranges. Just after the power-on operation or mode changing, the range is set to the
(NOTE) The " " mark means the default range. Changing to DC400mA range or AC400mA is available by only manual operation. Auto-range operation cannot change to these ranges.
(2-1-3)
Range setting ( Lock type switch & Manual-range : KMS = " H ",
RMS = " L "
)
The range setting shown in below table is available with RC1 to RC3 terminal RC1 H L H L H L H L RC2 H H L L H H L L RC3 H H H H L L L L DCV, ACV 400mV 4V 40V 400V 4000V 400mV 400mV 400mV ), diode check ( DCmA, ACmA 4mA 40mA 400mA 4000mA 4mA 4mA 4mA 4mA 400 4k 40k 400k 4000k 40M 400 400 C 4nF 40nF 400nF 4uF 40uF 400uF 4nF 4nF
( NOTE ) Frequency and revolution measurements are always set to the Auto-range. Ranges of continuity test ( to the default ranges ), ADP, DCA and ACA measurement are always fixed
NJU9214
(2-2) Push type switch (2-2-1) Measurement function selection ( KMS = " L ", ARMS = " X " ) Measurement function is set to the mode depending on the below matrix table; KI1 Don't care Don't care Don't care rpm KI2 HOLD FRQ DC / AC V Control Terminals KI3 MIN / MAX ADP mA KI4 MEM REL A KI5 READ CAP RANGE
Selection Terminals
FC1 FC2 FC3 FC4
All switches excepting for the power switch should be used non-locked push type switch. The range is set to the full auto-range mode and selected by the " RANGE " key. When the power is turned on, the mode is set to the DCV. When the auto power-off is released, the mode returns to the previous mode of auto power-off. The functions of HOLD, MIN/MAX, MEM, READ and REL are same as KI1 to KI5 input using lock type switch which is explained in ( 4 ) Attached functions. If some of switches are pressed at the same time, the input order is as follows, Selection terminal Control terminal < Example of the switch circuit > : : FC4 FC3 FC2 FC1 KI5 KI4 KI3 KI2 KI1
NJU9214
KMS FC2 FC3 FC4 FC1 KI1 KI2 KI3 KI4 KI5 RANGE ADP REL MEM MIN/MAX CAP READ
rpm
VSSD
V DC/AC FRQ HOLD
mA
A
NJU9214
(2-2-2) Range setting ( Push type switch : KMS = " L ", RMS = " X " ) The range setting shown in below table is available with the " RANGE " switch. When the switch is pressed once, the range is changed from auto to manual, and it's range is held. Then, the range is changed in every time by the switch operation. When the switch is pressed over than 1 second, the range always returns to Auto-range is possible from any range statuses. 1push(>1sec) Measurement Mode DCV AC V D C mA A C mA Resistance ( ) Continuity ( ) Diode ( ) AD P DCA ACA Frequency ( f ) Tacho ( rpm ) Capacitance ( C ) Auto Manual Range up 1push(<1sec) 1push(<1sec) R1 to R5 R1 to R5 R2 to R3 R2 to R3 R1 to R6 (R5R1) (R5R1) (R3R2) (R3R2) (R6R1) Range Control 400mV to 4000V 400mV to 4000V 40mA to 400mA 40mA to 400mA 400 to 40M Default Range 4V 4V 40mA 40mA 400 400 4V 400mV 40A 40A 100Hz 6000rpm 4nF
HOLD
RiRi+1
FIXED
R1 to R5 R1 to R3 R1 to R6
Auto - range HOLD RiRi+1 (R6R1)
100Hz to 999.9kHz 6000rpm to 600krpm 4nF to 400uF
( NOTE ) Frequency measurement and Tacho are always set to the auto-range. Ranges of continuity test ( ), diode check ( ), ADP, DCA and ACA measurements are always fixed to their default ranges. Just after power-on operation or changing mode, their ranges are set to the default range. In the ADP measurement, 3 units are displayed by setting of RC1 to RC3 terminals.
The R1 to R6 of above range control table are set a range corresponding to below table. RANGE R1 R2 R3 R4 R5 R6 DCV 400mV 4V 40V 400V 4000V - ACV 400mA 4V 40V 400V 4000V - DCmA - 40mA 400mA - - - ACmA - 40mA 400mA - - - 400 4k 40k 400k 4000k 40M f 100Hz 1000Hz 10kHz 100kHz 1000kHz - rpm 6000 60000 600k - - - C 4nF 40nF 400nF 4uF 40uF 400uF
( NOTE ) The " " mark means the default range. Changing to DC400mV range or AC400mV range is available by only manual operation. Auto-range operation cannot change to these ranges. When the auto-range is switched in DC400mV or AC400mV range, measurement is continued in the 400mV range. When overflow occurs in 400mV of the auto-range, its range changes to 4V range automatically.
NJU9214
(3) Example of the Latching Relay Driver Circuit RD1 to RD4 are normally " H ". ( Active " L " )
0.01
GND
COM 10A
SGND2 SGND1 AGND 33k 33k
SW1
, , ,CAP
0.99
IVSH IVSL ADP OVH VR7 VR6 VR5 VR4 VR3 VR2 VI ACOUT RMSIN OVX
9
100k PTC 500
100
SW2
DCV, ACV, , , , CAP, DCmA, ACmA, FRQ, rpm, ADP
DCmA, ACmA ACV,ACmA, FRQ,rpm
SW5 0.1uF
1k 10k 100k
0.022uF
others
1M 10M 100k
SW7
others
SW3
DC400mV,ADP
VDDA
SW7 Rectifier Circuit Block
RD1 RD2 RD3 RD4
VSSA RMS-DC Converter Power source SW
SW Changing coil of latching relay VDDD
RESET SET
1kx14
VDDD
SW1 SW2
VSSD
SW3
Sw4 and SW8 is used into the rectifier circuit block shown in the
74HC138
16 15 14 13 12 11 10 9
74HC138
16 15 14 13 12 11 10 9
SW4 SW5
Example of application circuit.
SW8 VDDD SW7 VDDD
VSSD
NJU9214
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
NJU9214
About 10ms pulse width signal shown in below table is outputted from RD1 to RD4. This pulse controls the Latching Relay Driving. FUNCTION * RANGE , , , CAP SW1 SW2 SW3 Set SW4 SW5 SW6 SW7 SW1 SW2 SW3 Reset SW4 SW5 SW6 SW7 Reset Set DCmA, ACmA DC400mV, ADP AC400mV , ACA ACmA, ACA, ACV, FRQ, rpm , , , CAP DCmA, ACmA DC400mA, ADP AC400mV , ACA ACmA, ACA, ACV, FRQ, rpm Relay RD1 RD2 RD3 RD4
( 4 ) Attached functions ( Functions with KI1 to KI5 are available by only lock type switches. ) (4-1) Data Hold : HOLD The hold or release of all display data is performed alternately by KI1 terminal input. However, A/D conversion is operating even though in the HOLD status, therefore the buzzer sounds at the over-range and the continuity test. In the auto-range operation, changing of range is available. (4-2) Relative Measurement : REL The relative measurement is selected when the switch connecting to KI2 terminal is pressed. In this mode, the value of difference between the present and the just before value is displayed. In case of the auto-range, the range is held at the just before range. However, the bargraph displays the absolute value, not the relative value. And the over-range also occurs from the absolute value of input. When the KI2 is pressed over than 1 second, the relative mode is released. (4-3) Min. / Max. Hold : MIN / MAX When the switch connecting to terminal KI3 is pressed, the mode is circulated as follows ; MIN Value Hold MAX Value Hold HOLD Release The bargraph always displays the input value. (4-4) Data Memory : MEN When the switch connecting to terminal KI4 is pressed, all of display data is stored into the memory. The stored data can be read out and displayed on LCD by pressing the READ key connecting to terminal KI5, and [MEM] mark blinks during this mode. This mode is released by pressing the READ key connecting to terminal KI5.
NJU9214
(4-5) Buzzer output 2kHz buzzer sounds at following cases ; [ 1 ] Key operation ( except function changing and range changing ) [ 2 ] Auto-power off operation [ 3 ] Continuity test ( ) ; less than 40 [ 4 ] Releasing from relative mode and MIN / MAX display [ 5 ] Changed between manual-range and auto-range by RCO terminal [ 6 ] Auto-range: Overflowing at 4,000V range Manual-range: Overflowing at every range except 400mV range [ 7 ] Power-on operating and Releasing from the Auto-power off mode [ 8 ] Twice sounds from 24 seconds before and every 8 seconds (4-6) Low-Battery Detector : BLD If the supply voltage is less than 4.0 0.4V, [ BATT ] mark is blinked. (4-7) Auto power-off If the key-operation doesn't work over than 30 minutes, the power is turned off automatically after 1 second buzzer sound, and all display is disappeared. ( the data in the memory is kept ) When the PON terminal is pressed or power switch is turned off, this mode is released. In case of release by PON terminal, the previous value of the auto power-off operation is displayed for 2 seconds. To void this function, the power should be turned on with pressing the switch connecting to the PON terminal. The NJU9214 gets some voltage surges during the power off mode by the auto power off operation, it might not return to usual operation correctly. (4-8) Setting the mode at Power-on, FUNCTIONS Range ( Auto range ) Range Hold Data Hold Relative Measure MIN / MAX Hold Data Memory Auto power-off Function and Range changing Power-on Default range Reset Function changing Default range Reset Reset All " 0 " display Auto off Hold Auto off Hold Auto off Range changing - Hold
(4-9) Display of ADP setting In measurement operation by the ADP function, the following display setting by RC1 to RC3 terminals is available.
NJU9214
RC1 H L H L H L H L ( 5 ) Serial Data output The NJU9214 has terminals (TXD,DTR,DSR) for serial data output with RS-232C format requiring a external RS-232C I/F LSI. When the TRX terminal is " L " level, data transmission is available, and when DSR terminal is also " L " level, the data starts to output. It selects the transmission rate by the TXS terminal, " L " level : 9,600bps, " H " level : 2,400bps. The logic levels from all of output terminals are " L " 0.8V, " H " 4.2V. (5-1) The structure of the serial data An unit of serial data consists of 11bits. The first bit of data is Start bit, the 2nd to the 9th bits are Data bits, the 10th and the 11th are Stop bits, therefore 11bits data structures a character as an unit. The data is transmitted from the LSB in sequence. Regarding the data order, please refer to [ ( 5 - 3 ) RS-232C Data Format ]. The data is outputted with the ASCII code. (5-2) Example of transmission waveform Example of transmission waveform on the TXD terminal is shown below. RC2 H H L L H H L L RC3 H H H H L L L L Mark Display Non ADP1 ADP2 X X X X X Decimal Point Non P1 P1 X X X X X Application Example hfe Measurement C (Temp. Measurement) F (Temp. Measurement) X X X X X X : ( Don't Care )
8 bit data
START BIT START BIT STOP BIT
8 bit data
STOP BIT
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
010011
DATA 1 Character
1 00 11 010111 0 0 0 11
DATA 1D ( HEX ) 1 Character
39 ( HEX )
The stop bit length is 2 bits.
NJU9214
(5-3) RS-232C Data format As shown below table, the data transmitted through the RS-232C is structured with 1 frame consisting of 17 characters. ( Example ) DCV measurement value = 100mV
DCV . , A = + 1 0 0 . 0 1 m , [CR]
BLD Unit Data Sign Measurement Mode FUNCTION (5-3-1) Function FUNCTION DCV ACV DCA ACA RESISTANCE Continuity Diode Capacitance Frequency Tacho ADP (5-3-2) Measurement Mode CHARACTER DCV ACV DCA ACA OHM CHK DIO CAP FRQ rpm ADP
Measurement Mode Absolute Value Relative Value (5-3-3) Sign This sign shows the polarity of data. Sign Positive Number Negative Number (5-3-4) DATA The data consists of six figures including a decimal point.
Character A R
Character + ( PLUS ) - ( MINUS )
NJU9214
(5-3-5) Unit This unit name shows the following characters. Unit Name MegaKilo- MilliMicroNano(5-3-6) Buttery Life Detector It shows the condition of buttery. Condition Normal Low-Buttery warning (5-3-7) Examples of various data [ Ex.1 ] In DCV400mV range, when following voltage is measured. Measured value 100.01mV Format Pattern DCV, A=+100.01m, [CR] Character ( Space ) B Character M K ( Space ) m n
The actual data from RS-232C line is shown below. ASCII CODE D HEX CODE &H44 RS232C DATA 00010001011 0 &H30 00000110011 C &H43 01100001011 1 &H31 0100011011 V &H52 00100101011 , &H2C 00011010011
***
***
m &H6D 01011011011
, &H2C 00011010011
&H20 00000010011
[CR] &H0D 01011000011
[ Ex.2 ] On the condition of Ex.1, when relative mode is used. To calculate the relative value, the reference voltage must be required. The reference voltage is the measured voltage of relative mode. Example of the reference voltage = 100.00mV. measured value relative value Format pattern DCV, R=+000.01, [CR] 100.01mV 100.01mV - 100.00mV = 0.01mV
NJU9214
[ Ex.3 ] In DCV400mV range, when overflow is occurred on the positive voltage side by 401mV input. Measured value Format pattern DCV, A=+.m, [CR] "." shows overflow, "+" shows overflow on the positive side. [ Ex.4 ] In DCV400mV range, when overflow is occurred on the negative voltage side by -401mV input. Measured value Format pattern DCV, A=-.m, [CR] "." shows overflow, "-" shows overflow on the negative side. [ Ex.5 ] In DCV400mV range, when the battery life detector warns under the condition of Ex.1. Measured value Format pattern DCV, A=+100.01m, B[CR] Battery life detector [ Ex.6 ] In ACA400mA range, when the following current is measured. Measured value Format pattern ACA, A=+040.00m, [CR] [ Ex.7 ] In resistance 400k range, Measured value Format pattern OHM, A=+100.10k, [CR] [ Ex.8 ] In frequency 10kHz range, when the following frequency is measured. Measured value Format pattern FRQ, A=+005.35k, [CR] [ Ex.9 ] In tachometer 6000rpm range, the following revolution is measured. Measured value Format pattern rpm, A=+02500, [CR] 2500rpm 5.35kHz 100.10k when the following resistance is measured. 40.00mA 100.01mV overflow on the "-" side overflow on the " + " side
NJU9214
(6) Reference voltage The resolution of NJU9214 is 25ppm ( 1/40000 ), and high precision is required for the reference power supply. The reference voltage requires a high precision and a temperature compensated type like as a band-gap reference. Reference voltages, VREF1 and VREF2 are about 0.2V, and VREF3 is about 1.4V. (7) Example of Display Layout (7-1) Connection of Common Line BATT AC COM4 COM3 COM2 COM1 0 10 20 30 40 DC AUTO REL HOLD MAX MIN MEN APF C mVA n F rpm M k Hz RS232C F
(7-2) Connection of Segment Line SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 BATT AC DC AUTO 0 (7-3) Segment Assignment COM1 COM2 COM3 COM4 COM1 COM2 COM3 COM4 COM1 COM2 COM3 COM4 SEG1 BPN BP0 BPDC SEG11 BP18 BP17 P3 HOLD SEG21 BP35 d0 g0 a0 SEG2 BP2 BP1 BATT SEG12 BP20 BP19 e2 f2 SEG22 BP37 BP36 c0 b0 SEG3 BP4 BP3 AUTO AC SEG13 BP21 d2 g2 a2 SEG23 BP39 BP38 MEM SEG4 BP6 BP5 e4 f4 SEG14 BP23 BP22 c2 b2 SEG24 BP40 n m APF SEG5 BP7 d4 g4 a4 SEG15 BP25 BP24 P2 MAX SEG25 M F V SEG6 BP9 BP8 c4 b4 SEG16 BP27 BP26 e1 f1 SEG26 k rpm F C SEG7 PB11 BP10 P4 REL SEG17 BP28 d1 g1 a1 SEG27 Hz A SEG8 PB13 BP12 e3 f3 SEG18 BP30 BP29 c1 b1 SEG28 RC232C / / / SEG9 BP14 d3 g3 a3 SEG19 BP32 BP31 P1 MIN / / / / / SEG10 BP16 BP15 c3 b3 SEG20 BP34 BP33 e0 f0 / / / / / 10 20 30 40 REL HOLD MAX MIN MEN APF C mV n F rpm M k Hz RS232C F A
NJU9214
a4
b4 f4 g4 c4 f3
a3
b3 g3 c3 f2
a2
b2 g2 c2 f1
a1
b1 g1 c1 f0
a0
b0 g0 c0
e4
e3
e2
e1
e0
BPBP0 BPN
d4
p4
d3
p3
d2
p2
d1
p1
d0
0
BPN
10
BPN
20
BPN
30
BP40 BPN
40
(7-4) Explanation of Display Mark 1. 2. 3. 4. BATT DC AC - : Low-Battery Detecting mark. : Displayed in DC voltage and DC current measurement mode. : Displayed in AC voltage and DC current measurement mode. : Displayed in DC voltage and DC current measurement negative input. This mark doesn't display in AC voltage, AC current, resistance( W ), frequency ( f ), diode ( 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. mV mA C F nF F k M Hz kHz rpm APF AUTO REL HOLD MAX MIN MEM ), and capacitance ( C ) and continuity ( ) measurement mode. : Displayed in the auto range measurement mode. : Displayed in the relative display measurement mode. : Data Hold. Displayed in Memory READ with READ key. : Displayed in maximum display mode. : Displayed in minimum display mode. : Displayed during memorizing data. Blinked during recalling the data. : Displayed in continuity test measurement mode. : Displayed in diode check measurement mode. : Displayed in DCmV and ACmV ranges. : Displayed in DCmA and ACmA ranges. : In ADP measurement mode, displayed with ADP1 mark. : In ADP measurement mode, displayed with ADP2 mark. : Displayed in capacitance measurement mode. ( 4nF, 40nF, 400nF ranges ) : Displayed in capacitance measurement mode.( 4mF, 40mF, 400mF ranges ) : Displayed in resistance measurement mode.( 400 range ) : Displayed in resistance measurement mode.( k range ) : Displayed in resistance measurement mode.( M range ) : Displayed in frequency measurement mode.( Hz range ) : Displayed in frequency measurement mode.( kHz range ) : Displayed in tachometer measurement mode. : Displayed under Auto Power Off operation. After 30 minutes from the last key input, the power is turned off automatically.
RS232C : Displayed in available mode of RS-232C Blinking under RS-232C operation.
NJU9214
(7-5) Bargraph display The bargraph displays 10 times speed comparing with numeric display. However it is not displayed in frequency, revolution and capacitance measurement mode 1. BP2. BP0 3. BP1 to 40 : Displayed when negative signal is input. : Displayed when the digital display is more than about " 00400 ". : BP1 is displayed when the digital display is more than about " 01000 ", then 1 segment display increases at every 1,000 counts. If overflow occurs, all of BP0 to BP40 are displayed. 4. The figures of " 0, 10, 20, 30, 40 " under the bargraph is displayed expecting for frequency, tacho and capacitance measurement mode.
(7-6) Over-range Display When the over-range is occurred, the display becomes " 40000 " and all digit blinks. However " 0000 " is displayed in frequency measurement mode, " 60000 " is displayed in revolution measurement mode, " 4000 " is displayed in capacitance measurement mode, and also every digit blinks in these modes. In relative measurement mode, but it is not concerned with the display value. All of digits blink when over-range occurs by the absolute input value
(7-7) Polarity Display In cases of the " 0 " display value, AC voltage, AC current, resistance ( ), diode ( frequency ( f ), tacho ( rpm ) and continuity test ( ) measurement mode, " - " However in relative measurement mode, any measurement modes display " - " . ), capacitance ( C ), mark is not displayed.
NJU9214
s ABSOLUTE MAXIMUM RATINGS
(Ta=25C) PARAMETER Supply Voltage Range Control Terminal Voltage Analog Terminal Voltage Supply Terminal Terminal OVH Terminal Current Others Operating Temperature Storage Temperature Range SYMBOL VDDA - VSSA VDDD - VSSD Vid Via IDD, IGND, ISS IOVH II Topr Tstg RATINGS 11 5.5 VDDD to VSSD VDDA to VSSA 50 50 10 0 to +50 -40 to +125 UNIT V V V V mA C C
VDDD and VDDA must be same voltage level.
s ELECTRICAL CHARACTERISTICS
(1) DC Characteristics ( VDD = + 5.0V, VSSA= - 5.0V, AGND = DGND = 0V, DC400mV range, Ta=25C) PARAMETER Operating Voltage Operating Current Negative Supply Voltage Low-Battery Detection Voltage Digital Display Linearity Bargraph Digital Display Polarity Error Bargraph Zero Reading Display Digital Display Sampling Capacitance M. Time Bargraph Digital Display Sampling Capacitance M. Rate Bargraph High Level Input Voltage Low Level Input Voltage Input Pull-Up Resistance
SYMBOL VDD IDD IPOF VSS VBLD Linn Ling Epn Epg Zero tsn tsnc tsg Nrn Nrnc Nrg VIH VIL RI
CONDITIONS VDD T erminal VDD T erminal, in auto Power off -VDD ( V ) about 0.8 V x VBLD ( V )
Input Series Resistor = 100k
TXS, TRX, FC1 to 4, RC0 to 3, KI1 to 5, T1 to 3, PON, KMS, RMS, RST T erminal TXS, TRX, FC1 to 4, RC0 to 3, KI1 to 5, T1 to 3, PON T erminal RST T erminal
MIN 4.75 - - -4.75 3.6 - - - - 0 - - - - - - 4.2 - 100 -
TYP 5.0 - - -5.0 4.0 - - - - 0 100 500 5 2 1 20 - - 300 10
MAX 5.25 1.5 0.01 -5.25 4.4 0.072 5 0.072 5 0 - - - - - - - 0.8 500 -
UNIT V mA mA V V
%FSCOUNT
NOTE
1 2
%FS
%FSCOUNT
%FS COUNT ms
cyc./s V V k
NOTE 1 : VDD is the general term for VDDA and VDDD. NOTE 2 : In this case, all of key input levels are High. In case of " LOW " level input into the key, 16uA current flow from a pin through an internal pull up resistance ( 300kTYP. ) in TXS, TRX, KMS, RMS, RC 0 to 3, FC1 to 4, KI1 to 5, PON, T 1 to 3 terminals and 500uA current flow from RST terminal though a pull up resistance ( 10k TYP. ).
NJU9214
DC Characteristic ( A / D conversion ) ( VDD = +5.0V, VSSA = -5.0V, AGND = DGND = 0V, DC 400mV range, Ta = 25C)
PARAMETER Buzzer Driving Current Digital Output Current Select Terminal Output Current Open voltage in Resistance Measurement Charging Voltage in Capacitance Measurement Input Leakage Current LCD Driving Voltage (VDSP is floating.) LCD Driving Voltage (VDSP and VSSD are shorted.) SYMBOL IOH1 IOL1 IOH2 IOL2 IOL3 VOHM VCAP ILO ILF VH VL VH VL SEG1 to 28, COM1 to 4 Terminal ( vs VDDD Voltage ) BZ Terminal DTR, TXD Terminal RD1 to 4 Terminal CONDITIONS VOH=4.7V VOL=0.3V VOH=4.6V VOL=0.4V MIN 0.25 -0.25 0.5 -0.5 -0.5 - - - - -0.8 -1.8 -1.4 -3.1 TYP 0.75 -0.75 1.0 -1.0 -1.0 0.4 5 - - -1.0 -2.0 -1.6 -3.3 MAX - - - - - - V user for " C " measurement VI Terminal VIN=0mV VIN=400mV - 10 40 -1.2 -2.2 -1.8 -3.5 V 4 pA 3 mA UNIT NOTE
FC1 to 4 Terminal VOL=0.4V (Push Switch Mode) user for , measurement
NOTE 3 : The current source outputs VDD = 5V as an open voltage, however in normal operation, about 1V as the threshold of comparator is maximum voltage.
NJU9214 about 1V
Measured Capacitor
0V
OVX OVH
SW1
SW1
SW2
about 1V
SW2
NJU9214
NOTE4 : LCD Diving Voltage ( Example of output waveform ) Waveform of 1/4 Duty, DC400mV range, VIN = 0mV
VDD
COM1
VDSP VDD
COM2
VDSP VDD
COM3
VDSP VDD
COM4
VDSP VDD
SEG1
VDSP VDD
SEG2
VDSP VDD
SEG3
VDSP VDD
SEG4
VDSP
1 cycle
NOTE5 : Terminals of digital line are protected by the ESD protection circuit, however terminals of analog line aren't protected enough because the parasitic capacitance must be decreased. Therefore, if the NJU9214 is given static electricity, it may be permanent breakdown. Therefore enough external surge protection is needed for assembling, carrying and keeping. (2) Switching characteristic
( VDDA = VDDD = +5.0V, VSSA = -5.0V, AGND = DGND = 0V, DC4V range, fXT=4MHz, Ta=25C ) PARAMETER Buzzer Output Frequency Data transmission rate LCD driver frequency Relay driver pulse width SYMBOL FBZ CONDITIONS BZ terminal TXD terminal ( TXS : H ) ( TXS : L ) SEG1 to 28, COM1 to 4 terminal RD1 to 4 terminal MIN - - - - - TYP 2.0 2400 9600 50 10 MAX - - - - - UNIT kHz bps Hz ms
tOUT
FLCD twrd
NJU9214
s Examples of application circuit.
(1) Circuit using lock type switch. ( Current Auto Manual-2 range mode, RMS = " H " )
DCV, ACV, , ,, CAP,
FUSE
AD P
10A COM
When /
FUSE
DCmA, ACmA, FRQ, rpm
/ CAP SW1 is ON. When AcmA/DcmA, SW2 is ON.
/
Reference Voltage element : over 2.5V Temperature coefficient : below 20ppm/C
SW2
VDDA +5V 180k 180k 100k
0.01
BATTERY
12k
12k
SW5 SW7 DC400mV : VI side Others : VR2 side 0.022uF 0.1uF
100k 100k
100
AGND
AC measurement : AC coupling side
SW1
9
0.99
0.1u
10k
10k
100u
100u
0.33u 1
SW3
0.01u 1
0.1u 1
VSSA -5V VDDD +5V
0.01u 1
0.01u 1
100K 2
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT2 INT1 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
ACOUT VDDA RMSIN VDDD VDDD RD1 RD2 RD3 RD4 TXS TRX KMS VDDD RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
VDDA
1 100
95
90
85
80
75
70
4MHz
10p 10p
BZ
VSS VSS
10 65
NJU9214
15 60
RS232C Driver
20 55
25
30
35
40
45
50 : Lock type switch : Push type switch
PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16
VSSD
BATT AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
C F mVA nFrpm MkHz
10 20 30 40
RS232C
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resisters or the adjustment by the trimmer potentiometer are recommended.
100K
5
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
510
100u
Rectification circuit block
33k 100k 33k 33k
Regulator
10M 2 1M 2 100K 2 10K 2 1K 2 100 2
VSSD
100K
100u
10K
NJU9214
(2) Circuit using lock type switch ( Current Manual-4 range mode, RMS = " L " )
DCV, ACV, , , , CAP,
FUSE
10A COM
4mA 40mA 400mA 4000mA
When /
/
/ CAP,
99 9 0.9 0.1
SW1 is ON.
Reference Voltage element : over 2.5V Temperature coefficient : below 20ppm/C BATTERY
FUSE
When Acm/DcmA, SW2 is ON.
DCmA, ACmA, FRQ, rpm
VDDA +5V 180k 180k 100k 0.1u 100u 10K AGND
AC measurement : AC coupling side
SW1 100
0.01
12k
12k
DC400mV : VI side Others : VR2 side
10M 2 1M 2 100K 2 10K 2 1K 2 100 2
0.1uF
100K 2
0.33u 1
0.01u 1
VSSA -5V VDDD +5V
0.01u 1
0.01u 1
SW3 Rectification circuit block
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT2 INT1 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
0.1u 1
33k 100k 33k 33k
510
100u
Regulator
10k
10k
0.022uF
SW5
100u
SW7
100k 100k
ACOUT VDDA RMSIN VDDD VDDD RD1 RD2 RD3 RD4 TXS TRX KMS VDDD RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
VDDA
1
100
95
90
85
80
75
70
4MHz
10p 10p
BZ VSS VSS
10
65
NJU9214
15 60
RS232C Driver
20 55
25
30
35
40
45
50
: Lock type switch PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 : Push type switch
VSSD
BATT
AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
C F mVA nFrpm MkHz
10 20 30 40
RS232C
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended.
100K
5
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
VSSD
100K
100u
ADP
NJU9214
(3) Circuit using push type switch ( Current Auto * Manual-2range mode, KMS = " L " )
DCV, ACV, , , , CAP
FUSE
ADP
SW2
10A COM
When /
/
/ CAP, SW1 is ON.
Reference Voltage element : over 2.5V Temperature coefficient : below 200ppm/C
When ACmA/DCmA,
FUSE
DCmA, ACmA, FRQ, rpm
SW2 is ON.
VDDA +5V 100k 10K
0.1u
BATTER
100uF
180k
180k
AC measurement : AC coupling side
9
0.99
0.01
100k 100k
100
12k
12k
AGND
SW7 DC400mV : VI side Others : VR2 side 0.022uF SW5 0.1uF
10k
10k
100uF
10M 2 1M 2 100K 2 10K 2 1K 2 100 2
0.33u 1
0.01u 1
SW3
VSSA -5V VDDD +5V
0.01u 1
0.01u 1
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT2 INT1 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
510
100uF
Rectification circuit block
100K 2
0.1u 1
33k 100k 33k 33k
Regilator
10p 10p
ACOUT VDDA RMSIN VDDD VDDD RD1 RD2 RD3 RD4 TXS TRX KMS RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
VDDA
1 100
95
90
85
80
75
70
4MHz
BZ
VSSD VSSD
10 65
NJU9214
15 60
SEG26
SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
RS232C Driver
20 55
25
30
35
40
45
50
: Lock type switch PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 : Push type switch
VSSD
BATT AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
C F mVA nFrpm MkHz
10 20 30 40
RS232C
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended.
100K
5
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27
VSSD
100K
100uF
NJU9214
(4) Application circuit of AC voltage and AC current measurement In case of AC voltage and AC current measurement, AC-DC conversion is required in the external circuit. In use of the mean square circuit, the measurement circuit realizes low cost system. And also in use of RMS/DC
converter, it realizes a root-mean-square measurement. The circuit example using AD736 ( Analog Devices, Inc. ) is shown below for a root-mean-square measurement. ( The circuit is for only reference, so please refer to the data book of Analog Devices, Inc. for details. ) 10M
VR2(PIN99) 0.022uF ACOUT(PIN1) VR7(PIN94) RMSIN(PIN3)
NJU9214
others SW8 AC4V to 4000 Vrange +-
DCmA,ACmA AC400mV,ACA AGND
SW4_1 1N4148 47K
VDDA
10uF AD736
SW4_2
1 2 3
RMS
Full-wave rectifier
8 7 6
AGND VDDA
AC400mV
1N4148
AC400mV
4
Converter block
5
VSSA
+ 33uF VSSA
Rectifier circuit block
10uF
(5) Notes of application circuits 1. The power source for NJU9214 is required stable, and enough current drivability. 2. Capacitors marked with 1 require low-leak type like as the polypropylene film. 3. Resistance ratio precision of input attenuator block affects measurement precision. Resistances marked with 2 requires within 0.01% tolerance resistors or adjustment by the trimmer potentiometer. 4. Designing of circuit pattern requires low wiring resistance between AGND terminal and SGND terminal. 5. Constants of resistances for voltage dividing and decoupling capacitor are not guaranteed value as to characteristic. Re adjustment is sometime required depending on elements and peripheral circuit. 6. RMS / DC converter requires full-scale and zero adjustment.
[CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.

▲Up To Search▲

Price & Availability of NJU9214

	To Download NJU9214 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .