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ES51921
22,000 Counts Auto DMM
Features
* 22,000 counts LCD driver with 46-segment bargraph display * Conversion rate : 2 times/s * Full automatic measurement *Voltage measurement: Manual 220.00mV / Auto 2.2000V - 1000.0V / Auto 220.00 - 1000.0V *Current measurement: A/mA/A *Resistance measurement: 220.00 - 220.00M *Capacitance measurement: 22.000nF - 220.00mF(25sec) *Frequency counter 22.00Hz - 220.00MHz * Current modes for clamp meter * Duty cycle measurement (5.0% ~ 94.9%) * Diode measurement * Continuity check * ADP mode with independent reference voltage * Temperature mode with internal scale translation circuit from oC to oF * Push functions *Range change function *VAHZ function *Relative function *Zero function in manual DCA mode *Data hold function with delay hold feature *MAX/MIN function *Back-light function *KEY function * Programmable LCD segment display Ver. 3.0 1 08/09/10 * Support low pass filter* for AC voltage & Clamp ACA measurement * SHIFT function * High-crest-factor signal detection * Band-gap reference voltage output * CE selection (610V, 1010V or 1500V) * Serial data output (RS232 format) * LCD segment check when power on * Auto power off with idle time selection * Sleep output * Re-power on * On-chip buzzer driver * 3V DC power supply
* Low battery detection for 3V or 9V battery
Description
ES51921 is an integrated analog-to-digital converter (ADC) with 22,000 counts LCD display, automatic range selection, and 3V DC power supply. Automatic range selection is provided for voltage (AC/DC) measurement, resistance measurement, current measurement, capacitance measurement, and frequency counter. Expensive and bulky mechanical range switches are not required. Other features include relative value display, Zero function, data holding, maximum and minimum holding, diode measurement, temperature measurement, continuity checking, low battery detection, auto power off, re-power on, and RS232 data output.
*Note: A multimeter with filtered measurement mode is a filed US patent. To avoid the patent infringement, produce a DMM with low pass filter mode is prohibited to export to USA. Keep pin55 floating could make the LPF mode disable.
ES51921
22,000 Counts Auto DMM
Application Digital multimeter Clamp meter Thermometer
Pin Assignment
Cyrustek. com.tw
ES51921
Ver. 3.0
2
08/09/10
ES51921
22,000 Counts Auto DMM
Pin Description
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Ver. 3.0 Symbol V+ V+ DGND AGND AGND CH+ CHCIH BUFFH CAZH CL+ CLCIL CAZL BUFFL RAZ IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC1 OHMC2 OHMC3 OHMC4 NC VRH VR SGND ADP VA+ VAV220m VR1 VBAR CAType O O P/G P/G P/G IO IO O O O IO IO O O O O I I I I O O O O O O IO O O I O O O O O O I G I I I I I I IO Description Output of on-chip DC-DC converter. Output of on-chip DC-DC converter. Digital ground. Connecting to 3V battery positive terminal. Analog ground. Analog ground. Positive connection for reference capacitor of high-speed A/D. Negative connection for reference capacitor of high-speed A/D. High-speed integrator output. Connect to integral capacitor. High-speed buffer output pin. Connect to integral resistor. High-speed auto-zero capacitor connection. Positive connection for reference capacitor of high-resolution A/D. Negative connection for reference capacitor of high- resolution A/D. High-resolution integrator output. Connect to integral capacitor. High-resolution auto-zero capacitor connection. High-resolution Buffer output pin. Connect to integral resistor Buffer output pin in AZ and ZI phase. Current measurement input for 2200A, 220mA and 22A modes. Current measurement input for 220A, 22mA. Input high voltage for resistance measurement Output connection for resistance measurement Sense low voltage for resistance measurement Reference resistor connection for 220.00 range Voltage measurement /10000 attenuator(1000.0V) Voltage measurement /1000 attenuator(220.00V) Voltage measurement /100 attenuator(22.000V) Voltage measurement /10 attenuator(2.2000V) Test pin DC signal low input in ACV/ACA mode. Connect to negative output of external AC to DC converter. DC signal high input in ACV/ACA mode. Connect to positive output of external AC to DC converter. Negative input of internal AC to DC OP Amp. Output of internal AC to DC OP Amp. Filter capacitor connection for resistance mode. Filter capacitor connection for resistance mode. Filter capacitor connection for resistance mode. Filter capacitor connection for resistance mode. Output of band-gap voltage reference. Typically -1.23V Reference input voltage connection. Typically -100mV Signal Ground. Measurement input in ADP mode. Connect to AGND if no used. For ADP mode. De-integrating voltage positive input. The input should be higher than VA-. For ADP mode. De-integrating voltage negative input. The input should be lower than VA+. Independent input terminal for AC/DC 220.00mV mode. Measurement Input. In temperature mode, it is used to control decimal point. In A or mA modes, it is used to control the `' or `m' sign. Negative auto-zero capacitor connection for capacitor measurement 3 08/09/10
ES51921
22,000 Counts Auto DMM
47 CA+ 48 R9K 49 R1K 50 NC 51 NC 52 LPFC1 53 LPFC2 54 LPFOUT 55 LPFON 56 LPFC3 57 BUZIN 58 SLEEP 59 FREQ 60 NC 61 - 90 SEG31 - SEG01 91 BP4 92 BP3 93 BP2 94 BP1 95 ANNUNC IO O O O O O I I I O I O O O O O O Positive auto-zero capacitor connection for capacitor measurement Connect to a precise 9K resister for capacitor measurement. Connect to a precise 1K resister for capacitor measurement. Capacitor C1 connection for internal low-pass filter Capacitor C2 connection for internal low-pass filter Capacitor C1 connection for internal low-pass filter Pull to V- to enable low-pass filter Capacitor C3 connection for internal low-pass filter Pull to V- to enable the BUZOUT. Sleep mode indicator, asserts low in SLEEP mode. Frequency counter input, offset V-/2 internally by the chip. LCD segment line 01 - 31 LCD backplane 4 LCD backplane 3 LCD backplane 2 LCD backplane 1 Square wave output at the backplane frequency, synchronized to BP1. ANNUNC can be used to control display annunciator. Connect a LCD segment to ANNUNC to turn it on; connect an LCD segment to its backplane to turn it off. Pulse to V- to enable HOLD function. Pulse to V- to enable manual mode and manual range selection. Pulse to V- to enable Relative function or Zero function. Pulse to V- to change mode. In ADP mode, if this pin is connected to V-, the buzzer output will be off when the ADP input overflows. Pulse to V- to enable MAX/MIN function. Back light function. Pulse low to set BKOUT pin output. Pulse to V- to enable VAHZ mode. Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer when BUZIN is low. If BKLIT function is enabled, this pin will change from -3V to +3V For 60 sec, once press BKLIT pin again within 60 sec, this pin will Change back to -3V. Crystal oscillator output connection Crystal oscillator input connection Clock signal input for programmable LCD segment display. Serial data input pin for programmable LCD segment display. Enable pin for programmable LCD segment display and SDO output enable Assert low to enable serial data output. Idle time selection for auto power off feature. Set to V- to change the backlight idle time from 60 sec. to 180 sec. Set to V- to enable the auto range voltage mode to start from 220.00V range. Assert low to enable LCD SHIFT future, only works in 220M, and all capacitor measurement ranges CE selection feature control pin. Select initial state. Switch 5 for function selection. Switch 4 for function selection. Switch 3 for function selection. 4 08/09/10
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 Ver. 3.0
HOLD RANGE REL_ZERO KEY MAX/MIN NC BKLIT VAHZ BUZOUT BKOUT OSC2 OSC1 SCLK SDATA PLCD RS232 APOSEL BKSEL VST SHIFT CESEL SLACDC FC5 FC4 FC3
I I I I I I I O O O I I I I I I I I I I I I I I
ES51921
22,000 Counts Auto DMM
121 122 123 124 125 126 127 128 FC2 FC1 SDO C+ CVVLBAT9 I I O O O P P I Switch 2 for function selection. Switch 1 for function selection. RS232 compliant serial data output. Positive capacitor connection for on-chip DC-DC converter. Negative capacitor connection for on-chip DC-DC converter. Negative supply voltage. Connecting to 3V battery negative terminal. Negative supply voltage. Connecting to 3V battery negative terminal. Low battery configuration. If 3V battery is used, connect it to AGND. The default low-battery threshold voltage is -2.3V. If 9V battery is Used, the low battery annunciator is displayed when the voltage of this pin is less than VRH (-1.2V)
Absolute Maximum Ratings
Characteristic Supply Voltage (V- to AGND) Analog Input Voltage V+ AGND/DGND Digital Input Power Dissipation. Flat Package Operating Temperature Storage Temperature Rating -4V V- -0.6 to V+ +0.6 V+ (AGND/DGND+0.5V) AGND/DGND (V- -0.5V) V- -0.6 to DGND +0.6 500mW 0 to 70 -25 to 125
Electrical Characteristics
TA=25, V- = -3V
Parameter Power supply Operating supply current In DCV mode Voltage roll-over error Voltage nonlinearity Input Leakage Low battery flag voltage Zero input reading Band-gap reference voltage VREF Peak to peak backplane drive voltage Counter time base period Symbol Test Condition VIDD Normal operation In sleep mode ISS REV 10M input resistor Best case straight NLV line V- to AGND 10M input resistor 100K resistor between VRH and AGND -3.5V V -2.2V fOSC = 4MHZ Between V- pin and HOLD, RANGE, KEY, FC1, FC2, FC3, FC4, FC5, BKLIT,MAXMIN Between V- pin and RS232 Open circuit voltage for 220 measurement 220 mode Min. -3.5 -- -- -- -- -10 -2.5 -000 -1.3 3.0 -- Typ. -3.0 2.0 2.5 -- -- 1 -2.3 000 -1.2 3.1 1 Max -2.5 2.5 5 0.03 0.03 10 -2.1 +000 -1.1 3.2 -- Units V mA A %F.S1 %F.S PA V counts V V sec
Internal pull-high to 0V current
--
1.2
-- A
-- --
11 -3.0
-- -- V
Ver. 3.0
5
08/09/10
ES51921
22,000 Counts Auto DMM
Open circuit voltage for measurement (except 220) Internal pull-low to Vcurrent AC frequency response at 2.2000V range 3dB frequency for LPF mode Reference voltage temperature coefficient and Continuity Mode Between GND Pin and SLACDC 1% 5% 3rd order LPF 100K resister Between VRH 0TCRF
Note: 1.Full Scale 2.Above specification from 22nF to 2.2uF ranges are specified under REL mode. The reading is calibrated to zero by relative function, when input is floating.
Function Description 1. Operating Modes
1.1 Voltage Measurement A re-configurable voltage divider automatically provides a suitable range in voltage measurement mode. The following table summarizes the full-scale ranges in each configuration.
Configuration Full Scale Range Divider Ratio Resistor Connection VR1 220.00mV1 1 VR2 2.2000V 1/10 R2 / (R1+R2) VR3 22.000V 1/100 R3 / (R1+R3) VR4 220.00V2 1/1000 R4 / (R1+R4) VR5 2200.0V 1/10000 R5 / (R1+R5) Note: 1. 2. 220.00mV range is independent and manual mode. The input pin is different from other voltage ranges. If VST is set to V- level, the auto range mode will start from 220.00V range. 2.2000V - 22.000V ranges only exist in manual mode. Input Pin V220m V.S. SGND VR1 V.S. SGND VR1 V.S. SGND VR1 V.S. SGND VR1 V.S. SGND
Ver. 3.0
6
08/09/10
ES51921
22,000 Counts Auto DMM
1.1.2 CE selection
ES51921 has a CE selection feature archived by configuring a CESEL pin. If pin CESEL is connected to V-, ES51921 will have a 610.0V overflow level in DCV and ACV ranges. If pin CESEL is connected to DGND, the overflow level will be set to 1010V. When it is floating, the overflow level is set to 1500V in DCV mode and 1010V in ACV mode. The meter will show OL when the measuring signal reaches the overflow level. The configuration of CESEL is listed below.
CESEL VDGND Floating 1.1.3 HCF signal detection
DCV 610.0 1010.0V 1500.0V
ACV 610.0V 1010.0V 1010.0V
ES51921 provides detection of high-crest-factor (HCF) signal in ACV mode. When this function is enabled, ES51921 senses the signal and determines it as HCF if the Vpp is large enough. Once the signal is determined as HCF, ES51921 will jump up one measuring range regardless of current measurement value. It takes 60ms to jump one range up. The jumping up process will continue until the maximum range is reached. With HCF detection, a more accurate result could be obtained. For example, when a input signal with Vpeak=240V, Vrms=40V(CF=6) was applied, traditional DMMs might stay at 22.000V range but shows counts with the amount of error up to 10% or even bigger. The error rises from limited input/output swing at internal ADC. With HCF detection, DMM will stay at 220.00V and exhibits more accurate results. In addition to accuracy improvement, HCF will speed up the measuring process for high voltage signals. For example, a 500Vrms is applied, ES51921 will take about 180ms (3 HCF jumps) to enter 1000.0 V range. And it takes 1 or 2 measuring processes to obtain the stable result. Thus a stable LCD reading could be obtained within 1 sec.
Ver. 3.0
7
08/09/10
ES51921
22,000 Counts Auto DMM
1.1.4 The true RMS-to-DC conversion with ES636 If ES636 is used for true RMS-to-DC measurement, the test circuit is shown in Figure 1. Make ADO and ADI pin short, and TEST5 pin keeps float. Connect OVSG pin to AGND through a switch in ACV measurement mode. If the DCV and ACV measurement modes are in the same rotary switch, please also add this switch in the rotary switch. The configuration of this switch will not influence the precision of DCV measurement. OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH
ACV 2.2u + + -Vs 10u 1 2 3 4 5 6 7 +Vs 14 13 12 11 10 150 9 8 100K +Vs 500K 2.2u + 20k 1k -Vs
100 1K 10K 101K 1.111M
ES51921
Figure 1. The true RMS-to-DC conversion with ES636
ES636
ADI ADO AGND
Ver. 3.0
8
08/09/10
ES51921
22,000 Counts Auto DMM
1.1.5 Low-pass filter feature ES51921 provides a 3-order low-pass filter to reduce the influence of high frequency noise above 1KHz(3dB). This LPF feature is available in all ACV or clamp_meter ACA modes. Set FC5 to low in these mode, the KEY bottom is use to activate the LPF feature. Press KEY bottom for less than 1 second force meter enter LPF mode, and the AC sign on LCD panel will blink until the LPF mode is canceled. When LPF is activated, most of noise above 1KHz will decay greatly. So we can obtain more stable and accurate readings on low frequency response. 1.2 Resistance Measurement A re-configurable divider automatically provides a suitable full-scale range in resistance measurement mode. The following table summarizes the full-scale ranges and the reference resistors in each configuration. In 220.00M, if SHIFT pin connects to V-, the least digit will not be displayed and the other digits and decimal point will shift right away. So the full scale becomes 220.0M instead of 220.00M.
Configuration OR1 OR2 OR3 OR4 OR5 OR6 OR7 Full Scale Range 220.00 2.2000K 22.000K 220.00K 2.2000M 22.000M 220.00M Divider Ratio R6 R5 R1 R4 R1 R3 R1 R2 R1 R1 Resister Connection 100 1K 10K 100K 1M 10M 10M
1.3 Current measurement for multimeter ES51921 has 2 automatic and 1 manual current measurement modes for multimeter. The following table summarizes the full-scale range of each mode. When ES51921 operates in the current measurement modes for multimeter, It takes high input from pin IVSH or IVSL, low input from pin SGND and reference voltage from pin VR.
Mode Automatic1 Automatic2 Manual Note: 1. The typical connection of input terminal is as the schematic below: FC1~4 1,1,0,1 1,1,1,1 0,0,0,0 VBAR 1 1 X Full Scale Input Terminal 220.00A / 2200.0A IVSL/IVSH V.S. SGND 22.000mA / 220.00mA IVSL/IVSH V.S. SGND 22.000A IVSH V.S. SGND
Vin* 9R R
100K 100K
IVSL IVSH
Ver. 3.0
9
08/09/10
ES51921
22,000 Counts Auto DMM
1.4 Current measurement for clampmeter ES51921 has 2 automatic and 4 manual current measurement modes for clampmeter. The following table summarizes the full-scale range of each mode. When ES51921 operate in the automatic mode1&2, it takes high input from IVSH/IVSL (higher range/lower range), low input from SGND and reference voltage from VR. When ES51921 operates in the manual mode1~4, It takes high input from ADP, low input from SGND and reference voltage from VA+ and VA-.
Mode Automatic1 Automatic2 Manual1 Manual2 Manual3 Manual4 Note: FC1~4 1,1,0,1 1,1,1,1 1,1,0,0 1,0,0,0 1,0,1,0 1,0,0,1 VBAR 0 0 X X X X Full Scale 220.00A / 2200.0A 22.000A / 220.00A 22.000A 220.00A 2200.0A 22000A Input Terminal IVSL/IVSH V.S. SGND IVSL/IVSH V.S. SGND ADP V.S. SGND ADP V.S. SGND ADP V.S. SGND ADP V.S. SGND
1. Connect VBAR to V- will disable the "2" / "m2" symbol on LCD panel. 2. In DC current modes for clampmeter, ES51921 provides Zero function for offset removing. 3. The typical connection of input terminal for automatic1&2 is as the schematic below:
Vin* RL
9R R
IVSL IVSH
Ver. 3.0
10
08/09/10
ES51921
22,000 Counts Auto DMM
1.5 Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode.
Configuration C1 C2 C3 C4 C5 C6 C73 C83 Note: 1. In order to obtain an accurate reading, a capacitor must be discharged before measurement begins. The chip has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the LCD displays dIS.C 2. Discharging through the chip is quite slow. We recommend the user to discharge the capacitor with some other apparatus. 3. In C7~C8 ranges, the bargraph is used to show the measured time in counting down. 4. The C2 range is calibrated by VR near the OVX pin. 5. In ranges of C1~C8, the SHIFT feature is also available to move the digits and decimal points rightward to prevent the least digit from jumping. Full Scale Range 22.000nF 220.00nF 2.2000uF 22.000uF 220.00uF 2.2000mF 22.000mF 220.00mF Resistance Ratio VR4 10k R9k/R1k R9k/R1k R9k/R1k R9k/R1k R9k/R1k
1.6 Continuity Check Continuity check shares the same configuration with 220.00 manual resistance measurement mode, but with buzzer output to indicate continuity. The buzzer generates a 2KHz sound whenever the digit number is less than 30. 1.7 Diode Measurement Diode measurement mode shares the same configuration with 2.2000V manual voltage measurement mode.. The buzzer generates a 2KHz sound whenever the digit number is less than 30mV.
Ver. 3.0
11
08/09/10
ES51921
22,000 Counts Auto DMM
1.8 Frequency counter The time base of the frequency counter is derived from an external crystal oscillator by Tcounter = 4,000,000 Fosc
where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second time base when a 4MHz oscillator is used. The frequency counter can select the proper range automatically or manually. Auto-range operation extends over seven decades, from 22.00Hz to 220.00MHz. The following table summarizes the full-scale range of the frequency counter. In frequency mode, press VAHz button switches the mode to/from duty cycle mode.
Range 2 FR1 3 FR2 FR3 FR4 FR5 FR6 FR7 NOTE:
1 2 3
Full Scale 22.00Hz1 220.0Hz1 22.000KHz 220.00KHz 2.2000MHz 22.000MHz 220.00MHz
In the range FR1~FR2, the maximum counting number is 2200 counts. In the Range FR1, ES51921 will show 0.00Hz if the input frequency is less than 2.00Hz. In the Range FR2 (manual mode), ES51921 will show 0.0Hz if the input frequency is less than 20.0Hz..
1.8.1Duty Cycle measurement The duty cycle measurement is available in frequency mode with VAHz operation. Press VAHZ key when frequency mode is in operation, the ES51921 will switch to duty cycle measurement mode. Press VAHz key again to switch to frequency measurement mode also. The duty cycle mode range is within 5.0% to 94.9%. The minimum resolution is 0.1%. If the source frequency duty cycle is smaller than 5.0%, the UL will be shown on the LCD display. If the duty cycle is larger than 94.9%, the OL will be shown on the LCD display.
Ver. 3.0
12
08/09/10
ES51921
22,000 Counts Auto DMM
1.9 Temperature measurement mode Temperature measurement mode takes input signal from ADP pin and reference voltage from (VA+ - VA-). ES51921 has a built-in -to- scale translation circuit, and only needs an external scale application circuit. The application circuit for scale is not required. In temperature measurement mode, the default range is 2200.0 or . The VBAR pin is used to control the second decimal point (DP2) on the LCD panel. When VBAR is LOW, DP2 is turned on and the first decimal point (DP1) is turned off. And the range becomes 220.00 and . 1.10 Auto power off and Idle Time selection ES51921 has a default auto power off function. If the meter is idle for more than the given idle time, the chip automatically turns the power off. The idle time to trigger the auto power off function is determined by pin `APOSEL'. If pin APOSEL is connected to V-, the idle time will be set to 30 minutes. If pin APOSEL is connected to DGND or floating, the idle time will be set to 15 minutes. When APO happens, the state of the meter is saved. The APO symbol on the LCD panel indicates whether the auto power off is enabled or not. In some cases, user might want to disable Auto power off. There are two ways to disable this feature as following: 1. Power on the meter when any of the push functions, except for HOLD is pressed down. 2. In addition, when RS232 output is active, the auto power off function is also disabled.
Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD is pressed again.
1.11 Sleep The meter enters sleep mode after auto power off. The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V) after re-power on. 1.12 Re-power on After auto power-off, pushing any of the push function or changing the rotary mode can turn on the meter again. If the meter is re-powered on by changing the rotary mode, the saved state is cleared. If the meter is re-powered on by push functions, the chip restores the saved state and enters HOLD mode. The LCD displays the saved value.
Ver. 3.0
13
08/09/10
ES51921
22,000 Counts Auto DMM
2. Measurement Mode Switching Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5, and KEY. When FC5 is high, the measurement mode list is below.
SLACDC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 FC1 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 0 FC2 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 FC3 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 0 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 0 FC4 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 Mode Voltage Measurement Auto DC Current Measurement(A) Auto DC Current Measurement(mA) 3 22A DC Current Measurement(A) DCmV 220.00mV 2 Manual DC 22.000A Manual DC 220.00A Manual DC 2200.0A Manual DC 22000A Resistance Measurement Continuity Check Resistance Measurement Frequency Measurement Capacitance Measurement Temperature Measurement Resistance Measurement Voltage Measurement Auto AC Current Measurement(A) Auto AC Current Measurement(mA) 3 22A AC Current Measurement(A) ACmV 220.00mV 2 Manual AC 22.000A Manual AC 220.00A Manual AC 2200.0A Manual AC 22000A 1 ADP0(22000) ADP1(2200.0) ADP2(220.00) ADP3(22.000) ADP4(2.2000) Temperature Measurement Capacitance Measurement (Clamp)4 Function of KEY DCV ACV DCA ACA DCA ACA DCA ACA DCmV ACmV DCA ACA DCA ACA DCA ACA DCA ACA Continuity Continuity Diode Continuity Diode -- -- Diode ACV DCV ACA DCA ACmA DCmA ACA DCA ACmV DCmV ACA DCA ACA DCA ACA DCA ACA DCA -- -- -- -- -- --
X means "don't care". Note1: When FC5 is high, the ADP0, ADP1, ADP2, ADP3 and ADP4 modes can display minus sign. Note2: The manual DC/AC 22A, 220A, 2200A and 22000A modes are designed for clampmeter. Note3: DC 22A and AC 22A current measurement modes, (FC1~4) = (0, 0, 0, 0), are designed for multimeter. Note4: It provides the ranges from 2.2uF to 220mF in this mode.
Ver. 3.0
14
08/09/10
ES51921
22,000 Counts Auto DMM
When FC5=low, KEY is disabled and the measurement mode list is below.
SLACDC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 FC1 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 0 FC2 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 FC3 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 0 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 0 FC4 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 Mode DC Voltage Measurement Auto DC Current Measurement(A) Auto DC Current Measurement(mA) 3 22A DC Current Measurement(A) DC 220.00mV 2 Manual DC 22.000A Manual DC 220.00A Manual DC 2200.0A Manual DC 22000A Resistance Measurement Continuity Check Diode Measurement Frequency Measurement Capacitance Measurement Temperature Measurement (oC) Resistance Measurement AC Voltage Measurement Auto AC Current Measurement(A) Auto AC Current Measurement(mA) 3 22A AC Current Measurement(A) AC 220.00mV 2 Manual AC 22.000A Manual AC 220.00A Manual AC 2200.0A Manual AC 22000A 1 ADP0(22000) ADP1(2200.0) ADP2(220.00) ADP3(22.000) ADP4(2.2000) Temperature Measurement (oF) Capacitance Measurement (Clamp)4 Push KEY to enable LPF mode
O O(VBAR to V-) O(VBAR to V-) O O O O O
X means "don't care". Note1: When FC5 is low, the ADP0-ADP4 modes can not display minus sign. Note2: The manual DC/AC 22A/220A/2200A/22000A modes are designed for clampmeter. Note3: DC 22A and AC 22A Current Measurement mode, (FC1~4) = (0, 0, 0, 0), is designed for multimeter. Note4: It provides the ranges from 2.2uF to 220mF in this mode.
Ver. 3.0
15
08/09/10
ES51921
22,000 Counts Auto DMM
3. Push function All the enabled push functions will be reset when the measurement mode is changed by rotary switch. Change measurement mode by KEY function will reset enabled Range, Hold, Max/Min, REL, and Zero functions. The following table lists the available function versus every measurement mode. Function Mode Voltage Current1 Current2 Resistance Capacitance Frequency Duty cycle Continuity Diode Temperature ADP Note:
Current1 includes Auto A, Auto mA and 22A modes. Current2 includes Manual 2.2A, 22A, 220A, 2200A and 22000A modes.
Range O O X O O O X X X X X
Hold O O O O O O O O O O O
Max/Min O O O O O X X O O O O
REL O O AC O O X X O O O O
Zero X X DC X X X X X X X X
VAHz O O O X X O X X X X X
3.1 HOLD and Delay HOLD HOLD mode makes the meter stop updating the LCD panel. This mode can be nested in most of the special modes. Enabling HOLD function in automatic mode makes the meter switch to manual mode, but the full-scale range remains the same. HOLD function can be cancelled by changing the measurement mode, pressing RANGE, or push HOLD again. ES51921 provides a Delay HOLD feature. To activate Delay HOLD feature, press down the HOLD bottom and last for 2 seconds. The meter will delay for 6 seconds, than enters HOLD mode. In the 6-secnod delayed time, the HOLD symbol on LCD panel will blink. To cancel the delayed state, push the HOLD bottom again.
Ver. 3.0 16 08/09/10
ES51921
22,000 Counts Auto DMM
Normal mode Push < 2s HOLD mode (Auto/Manual) Push < 2s (Manual) Push > 2s Push < 2s Delay State (Auto/Manual) Push > 2s 6sec past
3.2 Range RANGE pin switches to and from automatic and manual mode, and while in manual mode, changes the full-scale range. The following figure shows the state transition.
1 push < 1 sec
Automatic Mode
1 push > 1 sec
Manual Mode Range up
1 push < 1 sec
Measurement Mode 220.00mV(DC/AC) V(DC/AC) Auto 220V/1010V (Set VST to low) Auto A(DC/AC) Auto mA(AC/DC) 22 A(DC/AC) Auto 22A/220A (DC/AC) Auto 220A/2200A (DC/AC) Capacitance Capacitance (Clamp mode) Continuity Diode Frequency
Auto VR1 VR2 - VR5 VR4-VR5 R1 - R2 R1R2 Fixed R1 - R2 R1R2 OR1 - OR7 C1 - C8 C3 - C8 fixed fixed FR1 - FR7
Manual Control Range Initial Range VR1 220.00mV 220.00mV VRi VRi + 1, 2.2000V - 1010.0V 2.2000V VR5 VR2 VRi VRi + 1, 2.2000V - 1010.0V 220.00V VR5 VR2 R1 R2, 220.00A - 2200.0A 220.00A R2 R1 R1 R2 22.000mA - 220.00mA 22.000mA R2 R1 Fixed 22.000A 22.000A R1 R2, 22.000A - 220.00A 22.000A R2 R1 R1 R2 220.00A - 2200.0A 220.00A R2 R1 ORi ORi + 1, 220.00 - 220.00M 220.00 OR7 OR1 Ci Ci + 1, 22.000nF - 220.00mF 22.000nF C8 C1 Ci Ci + 1, 2.2000F - 220.00mF 2.2000F C8 C3 fixed 220.00 220.00 fixed 2.2000V 2.2000V FRi FRi + 1 22.00Hz - 220.00MHz 22.00Hz FR7 FR1
Note: Pushing RANGE resets all existing special modes.
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3.3 KEY See Section "Measurement Mode Switching" for the function of this pin. 3.4 REL + HOLD In REL mode, the LCD panel displays DN+K - DN, where DN = 1, 2, 3, ... , DN is the last value before REL is pushed, and DN+K is the current value. If REL is pushed again in REL mode, the meter displays the reference value. The meter returns to normal operation if REL is pressed and held for longer than one second. Pressing HOLD in REL mode makes the meter stop updating the LCD panel.
push REL push HOLD
Original State (Auto/Manual)
push REL
RELactive. The relative value
RELandHactive. Hold the relative value
push HOLD
Note: It's possible that the relative value exceeds 22,000 or -22,000 counts. Such relative values are displayed. The LCD panel shows OL in REL mode only if DN or DN+K is more than 22,580 counts. 3.5 Max/Min + HOLD The meter displays the maximum or minimum value of the input in Max/Min mode. When Max/Min is pressed for the first time, the meter displays the maximum value. When Max/Min is pressed again, the meter displays the minimum value. When Max/Min is pressed for the third time, the meter displays current value with Max/Min blinking. The meter returns to normal operation if Max/Min is pressed and held for longer than one second. Pressing HOLD in Max/Min mode makes the meter stop updating the maximum or the minimum value.
1 push<1s 1 push>1s Original state (Automatic/manual) 1 push>1 sec 1 push>1 sec
"MAX" active 1push<1s "MIN" active 1push<1s "Max" "MIN" blink min value current value max value Push HOLD 1push<1s Push HOLD Push HOLD
"MAX""MIN" "H" blink "MIN" "H" active "MAX" "H" active hold max value. 1push<1s hold min value. 1push<1s hold current value. 1push<1s Ver. 3.0 18 08/09/10
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22,000 Counts Auto DMM
3.6 Relative + Max/Min + HOLD Max/Min mode can be nested in REL mode. The meter displays the maximum or minimum value relative to the reference when Max/Min is pressed in REL mode. Pressing HOLD under REL + Max/Min makes the meter stop updating the LCD panel. Original State (Auto/Manual)
Push REL Push REL
RELactive. The relative value
Push Max/Min REL andMaxactive. Push Max/Min > 1s
RELandMinactive. Minimum rel. value
REL Max Min blink. Current rel. value
Maximum rel. value
Push Max/Min Push HOLD
Push Max/Min Push HOLD Push HOLD
REL,Max, Hactive. Hold max. rel. value
REL, Min, Push Max/Min
Hactive. Hold min. rel. value
Push Max/Min Push Max/Min
REL Max , Min , , Hblink. Hold the current rel. value
3.7 Zero : In manual DC 22.000A, 220.00A, 2200.0A and 22000A measurement modes, the REL pin changes to control Zero function instead of relative function. In Zero mode, the LCD panel displays DN+K - DN, where DN = 1, 2, 3, ... , DN is the last conversion value before Zero is pushed, and DN+K is the current conversion value. If Zero is pushed again in Zero mode, the meter will refresh the DN value and displays the DN+K - DN again. The meter returns to normal operation if Zero is pressed and held for longer than one second. Pressing HOLD in Zero mode makes the meter stop updating the LCD panel. In Zero mode, LCD will not show any symbol to remind users of Zero mode is active. In 2-range auto DCA modes for clampmeter (220.00A/2200.0A or 22.000A/220.00A), the system will stay in automatic mode, even if the Zero function is activated. In other words, it could achieve real automatic operation. In automatic mode, Zero function could not be entered from higher range, but it could be still activated if current range is lower one. This is because most residual current value is so small that
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22,000 Counts Auto DMM
the range could not be higher one in automatic mode. When enter Zero mode from lower range, the system will store the nonzero counts (residual current value). If the range goes up to higher one automatically, the nonzero counts will be divided by ten. So this function will still work well in automatic modes. State diagram for Zero mode: Original State Press Zero Press Zero > 1s `Zero' Active Show DN+K - DN State diagram for Zero + HOLD mode: Original State Press Zero Press Zero > 1s `Zero' Active Show DN+K - DN Press Hold `Zero' `Hold' Active Stop LCD upgrading State diagram for Zero + Max/Min + HOLD mode: Original State Press Zero Press Zero > 1s `Zero' Active Show DN+K - DN Press Max/Min `Zero' `Max' Active Max. DN+K - DN Value Press HOLD Press Max/Min > 1s `Zero' `Min' Active `Zero' `Max' `Min' blink. Current DN+K - DN Value Press HOLD `Zero' `Max' `Min' `Hold' blink. Hold Current DN+K - DN Value Min. DN+K - DN Vl Press Max/Min < 1s Press HOLD `Zero' `Min' `Hold' Active Hold Min. DN+K - DN Value Press Max/Min < 1s
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Press Zero < 1s
Press Zero < 1s
Press Zero < 1s
`Zero' `Max' `Hold' Active Hold Max. DN+K - DN Value
ES51921
22,000 Counts Auto DMM
4. Serial Data Output The RS232 function will be activated if the RS232 pin is pulled to and asserts at V-. The serial data sent to SDO pin once every A/D conversion cycle. The data format complies with JIS 7Bits-transmission code with a baud rate of 19230. The host can use RS232 interface to read the data. A single data packet includes a start bit (always 0), 7 data bits, an odd parity check bit, and a stop bit (always 1). The high and low voltage levels correspond to DGND and V- respectively. SDO remains at 1 (high) when it is inactive. Hence the start bit (0) could be used as the triggering signal to begin the reading process. The following figure shows the data format of a single packet. The LSB is sent first and the MSB is sent last.
single package
0V -3V
0
LSB
D0 ~D6
p P1
MSB
One data block consists of 14 packets, or 140 bits. The following figure shows the format of a data block. The range packet indicates the full scale range of the meter. Digit4 through digit0 are just the digits on the LCD panel. The function packet indicates the measurement mode of the meter. Status, option1~4 give the status of the meter. CR and LF are delimiters used to separate the blocks.
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all packets
The meter always outputs the current input value to the serial port in spite of HOLD mode. The detailed data format of each packet is listed at next page.
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4.1 FUNCTUON This packet indicates the measurement mode of the meter. The following table summarizes the transmitted code for each mode. Note that the encoding of this packet is different from the encoding of FC1-FC5 switch.
Code 0111011 0111101 0111111 0110000 0111001 0110011 0110101 0110001 0110010 0110110 0110100 0111110 1. 2. 3. Measurement Mode Voltage Auto A Current Auto mA Current 22 A current Manual A Current Continuity Diode 1 Frequency Capacitance 2 Temperature ADP VBAR=0 Don't care Auto A Current Auto mA Current Auto 220.00A/2200.0A Auto 22.000A/220.00A VBAR=1
Don't care
When the function code = 0110010, the measurement mode is determined by judge bit of Status packet. If judge bit is 1, it means frequency mode. If judge bit is 0, it means duty cycle mode. When the function code = 0110100, the judge bit in the Status packet determines whether the unit is Celsius or Fahrenheit. And the digit4~0 only presents Celsius value whatever the mode is oC or oF. When the function code = 0111101 or 0111111, the measurement mode is determined by VBAR bit.
4.2 RANGE This packet indicates the full-scale range of the meter. When the meter operates in continuity mode or diode mode, this packet is always 0110000 since the full-scale ranges in these modes are fixed. The following table lists the code for each range in each measurement mode.
Code V *2-range auto A 22 A Manual A 0110000 2.2000V Lower Range(IVSL) 22.000 A 2.2000A 0110001 22.000V Higher Range(IVSH) 22.000A 0110010 220.00V 220.00A 0110011 2200.0V 2200.0A 0110100 220.00mV 22000A 0110101 0110110 0110111 *It includes auto A, mA, 22.000A/220.00A, 220.00A/2200.0A. ADP ADP4 ADP3 ADP2 ADP1 ADP0 220.00 2.2000K 22.000K 220.00K 2.2000M 22.000M 220.00M Frequency Capacitor 22.00Hz 22.000nF 220.0Hz 220.00nF 2.2000F 22.000KHz 22.000F 220.00KHz 220.00F 2.2000MHz 2.2000mF 22.000MHz 22.000mF 220.00MHz 220.00mF
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4.3 DIGIT 4 - DIGIT 0 Digit 4 is the first significant digit on the LCD panel, and digit 0 is the least significant digit.
Digit 0 1 2 3 4 5 6 7 8 9 Code 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001
4.4 STATUS The format of this package shown below. The Judge field is meaningful only when the Function packet indicates Temperature mode. In Temperature mode, judge is 1 if the unit is C and is 0 of the unit is F. Sign field indicates whether the minus sign on the LCD panel is on or off. BATT field is one when battery low condition is true. OL indicates input overflow.
0 BIT6 1 BIT 5 1 BIT 4 Judge BIT 3 Sign BIT 2 BATT BIT1 OL BIT 0
4.5 OPTION 1 This packet contains information on the push function of the meter. The format is shown below. MAX, MIN or RMR bit will be high if the meter enter Max/Min function and stay at state of maximum, minimum or current value respectively. REL bit will be high if meter enters REL/Zero mode.
0 BIT 6 1 BIT 5 1 BIT 4 MAX BIT 3 MIN BIT 2 REL BIT 1 RMR BIT 0
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4.6 OPTION 2
0 BIT 6 1 BIT 5 1 BIT 4 UL BIT 3 0 BIT 2 0 BIT1 0 BIT 0
Under the following conditions, the UL bit will be set to 1. 1. In 22.00Hz range, the input frequency is less than 2.00Hz. 2. In 220.0Hz range, the input frequency is less than 20.0Hz. 3. In duty cycle mode, the reading is less than 10.0%.
4.7 OPTION 3 This packet contains information on the operation mode of the meter. The format is shown below. The DC field indicates that the meter operates in DC measurement mode, either voltage or current. The AC field indicates that the meter operates in AC measurement mode, either voltage or current. The AUTO field is set to one if the meter operates in automatic mode, and is set to zero when the meter operates in manual mode.
0 BIT 6 1 BIT 5 1 BIT 4 DC BIT 3 AC BIT 2 AUTO BIT 1 VAHZ BIT 0
4.8 OPTION4 This packet contains information on the operation mode of the meter. The format is shown below. VBAR will be set to high, only when the VBAR pin is connected to V-. Hold bit is set to high when meter enters hold mode. LPF bit is set to high when the low-pass-filter feature is activated.
0 BIT 6 1 BIT 5 1 BIT 4 0 BIT 3 VBAR BIT 2 Hold BIT 1 LPF BIT 0
4.9 CR Carriage returns. The transmitted code is 0001101. 4.10 LF Line feed. The transmitted code is 0001010.
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5. Miscellaneous The conditions on which the meter turns on the buzzer include: (1) Changing measurement mode generates one beep. (2) Pressing any of the push functions generates one beep, if the function is valid. (3) Power on and re-power on generate one beep. (4) Input overflow in voltage (220mV range not included) and current mode generates one beep every 0.3 seconds (or 3.33 beeps per second.) (5) Continuity(diode) check generates a continuous 2KHz beep whenever the measurement is less then 30(30mV) (6) Auto power off generates a 2KHz beep that lasts for 1.5 seconds. The following figures show the output waveform from the BUZOUT pin.
0.5 mS
(a) Continuous 2KHz beep
0.15 sec
0.3 sec
(b) 3.33 beep/sec
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22,000 Counts Auto DMM
5.1 LCD Panel Configuration
BP1
BATT AUTO MANU HOLD APO DC AC RS232
% REL MAX MIN ADP0
ADP1 ADP2 ADP3 ADP4
n 1 m1 F 2 m2 V A M K Hz
22.5
BP2 BP3 BP4
BP1 BP2 BP3 BP4 BP1 BP2 BP3 BP4 BP1 BP2 BP3 BP4
0
5
10
15
20
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11 BATT APO DC AUTO 5F 5A 5B MANU 4F 4A 4B bar- RS232 AC 5E 5G 5C DP4 4E 4G 4C bar0 bar2 bar4 bar6 bar8 5D bar11 bar13 bar15 4D bar18 bar1 bar3 bar5 bar7 bar9 bar10 bar12 bar14 bar16 bar17 bar19 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 O O 1A HOLD 3F 3A 3B C F 2A % DP3 3E 3G 3C DP2 2F 2G 2B DP1 1F 1G bar20 bar22 3D bar25 bar27 2E 2D 2C bar32 1E 1D bar21 bar23 bar24 bar26 bar28 bar29 bar30 bar31 bar33 bar34 bar35 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 2 1B V A REL ADP1 n m2 1 1C M K Hz MAX ADP2 bar36 bar38 bar40 bar42 bar44 MIN ADP3 m1 bar37 bar39 bar41 bar43 bar45 ADP0 ADP4 F
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LCD Backplane Waveform
V- +3.2 V- +3.1
VV- +3.2 V- +3.1
V-
VV- +3.2 V- +3.1
V-
VV- +3.2 V- +3.1
V-
VV- +3.2 V- +3.1
V-
V-
5.2 LCD display on condition
LCD Annunciator V A F Hz % DC AC AUTO MANU HOLD REL MAX / MIN m1 Condition In voltage measurement mode, and diode measurement mode. In current measurement mode. In resistance measurement mode, and continuity mode. In capacitance measurement mode. In continuity check mode. In diode mode. In frequency mode. In duty cycle mode. In DC voltage or DC current mode. In AC voltage or AC current mode. When automatic full scale range selection is enabled. In manual mode. When HOLD function is enabled. When Relative function is enabled. When Maximum or Minimum function is enabled. In capacitor measurement mode and the full scale range is in the order of mF. In capacitor measurement mode and the full scale range is in the order of uF. In capacitor measurement mode and the full scale range is in the order of nF. In voltage or current measurement mode and the full scale range is in the order of 10-3. In current measurement mode and the full scale range id in the order of uA. In resistance measurement mode and the full scale range is in the order of M In resistance measurement mode and the full scale range is in the order of K In temperature measurement mode and when the unit is In temperature measurement mode and when the unit is When auto power off function is enabled. When RS232 output is enabled.
1
n m2
2
M K APO RS232
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5.3 Programmable LCD Segment Display ES51921 supports a "Programmable LCD Segment Display"(PLSD) feature. Except capacitor measurement mode & duty cycle measurement, all modes could support PLSD. PLSD allows the meter designer to process or modify the conversion results by external microprocessor and displayed on LCD panel. The more accurate and stable reading would be possible. ES51921 provides uPLCD, SCLK and SDATA pins to archive the PLSD feature. Connect uPLCD to V- to enable PLSD feature and received the serial data from SDO pin. After the data processing, transfer the display data through the SDATA and give a clock signal to SCLK. ES51921 will receive the display data through SDATA at the falling edge of clock signal, then display the data on LCD panel. Only the segments shown below could be modified, other segments are still controlled by ES51921. When capacitor or duty mode is selected, the LCD display is determined by ES51921. About the details of serial data format, please refer to page 21-25.
D5 a D4 a D3 a D2 a D1 a
ADP0
f g Lsign e d DP4 c e d DP3 c e d DP2 c e d DP1 c e d c b f g b f g b f g b f g b
ADP1 ADP2 ADP3 ADP4
PLSD Data format:
B1 B13 B2 B14 B3 B15 B4 B16 B5 B17 B6 B18 B7 B19 B8 B9 B10 B11 B12
OL ADP0 ADP1 ADP2 ADP3 ADP4 D1a D1g
B25
D1b
B20
D1c
B21
D1d
B22
D1e
B23
D1f
B24
DP1
B26
D2a
B27
D2b
B28
D2c
B29
D2d
B30
D2e
B31
D2f
B32
D2g
B33
DP2
B34
D3a
B35
D3b
B36
D3c
B37
D3d
B38
D3e
B39
D3f
B40
D3g
B41
DP3
B42
D4a
B43
D4b
B44
D4c
B45
D4d
B46
D4e
D4f
D4g DP4 D5a D5b D5c D5d D5e D5f D5g Lsign Note: The B1 should be sent first and the B46 sent last. Set the OL bit = 1, the buzzer output will be active for 3.3beep/sec in voltage & current mode. And if auto range is available, it will change to higher range if LCD bar44 is active also.
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Block diagram: RS232 DATA ... PLSD DATA
FC1-FC5/SLACDC
SDO SCLK SDATA uPLCD ES51921
P
Operation timing diagram for PLSD feature is shown as below: tdelay
RS232 data is received
46 clock pulses
Start to send PLSD data
SCLK SDO SDATA CR LF
...
PLSD data
tHIG SCLK tSETU SDATA
tLOW
tF
tR
tHOLD
Parameter Symbol Min. Typ. Max. Unit SCLK clock frequency 10 100 KHz fSCLK SCLK clock time "L" 4.7 tLOW us SCLK clock time "H" 4.0 tHIGH Data input setup time tSETUP 200 ns Data input hold time tHOLD 100 SCLK/SDATA rising time 1.0 tR us SCLK/SDATA falling time 0.3 tF SCLK delay time after 0.1 100 ms tdelay receiving RS232
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5.4 Operating Timing ES51921 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The ADC consists of a high-resolution part for digital display and a high speed part for the bar-graph display. The time of each phase is shown below: *Voltage /Current /Ohm/Cont./Diode/ADP measurement: Phase ZI AZ INT DINT High resolution 100ms 74ms 100ms 226ms High speed 10ms 7.4ms 10ms 22.6ms
*Capacitance measurement: Range 22.000nF 220.00nF 2.2000uF 22.000uF 220.00uF 2.2000mF 22.000mF 220.00mF Maximum measurement period 0.5sec 0.5sec 0.5sec 0.5sec 0.5sec 1sec 5sec 25sec
*Frequency measurement The measurement cycle = 1.05 sec
P.S. In the frequency measurement with auto mode, if the range is changed, the internal clock rate will increase five times and the new measurement cycle becomes 0.21 sec until the range is stable.
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6. Test Circuit
1. Voltage test
AGND OVSG 100 1K 101K 1.111M D2 D1 1.0u 3.9K 3K 3.9K 4.7u 1.0u 0.1u 88M
10.01K
4. Current test
OR1 VR5 VR4 VR3 VR2 ADO ADI ACVL ACVH TEST5 A mA uA V R 1 10M -100mV Voltage input 100 Z1 6V Z2 PTC 1.5K VR1 22n 220n 330n OVX OHMC4 OHMC3 OHMC2 OHMC1 OVH OVSG OR1 VR5 VR4 VR3 VR2 SGND AGND 0V 10M VR2 OVSG V R 900 0.01 0.99 9 90 AGND SGND
20A mA mA uA uA 100K 100K
IVSH IVSL
2K
5. Diode test
AGND OVH
2. Resistor test
1.111M
PTC 1.5K
47n 100
6. Low battery
9V BA TT 270K 680K LBAT9 0.1u AGND V-
Z1 6V Z2
100 1K
10.01K
101K 1.111M
3. Capacitor test
20k 100k OVX 220p 100 OVH OVSG 100 1K 10K 101K 1.111M OR1 VR5 VR4 VR3 VR2 CA+ CAR9k R1k -100mV
7. ADP test
VA+ VAADP 100K SGND AGND
PTC 1.5K
8. Frequency test
F R E Q
Z1 6V Z2
ADPin+ ADPin-
200
2.2u PTC 1.5K Fin
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7. Application Circuit
7.5V ZI 5.6V ZI 3V + 470n 10 0.1
Microprocessor
V4M
5.6V ZI
VAHZ BUZOUT BKOUT OSC2 OSC1 SCLK SDATA uPLCD (110) RS232 APOSEL BKSEL VST SHIFT (115) CESEL SLACDC FC5 FC4 FC3 (120) FC2 FC1 SDO C+ C- (125) VVLBAT9 (128)
A 900 mA 90 9 A 0.99 0.01
R C
3K 2K 3.9K 1 D1
+
V+ (1) V+ DGND AGND AGND (5) CH+ 10n CHA 22n CIH 100k BUFFH 47n A CAZH (10) CL+ 100n mA CL220n CIL 470n CAZL mA 100k BUFL (15) 10k RAZ A 100K IVSH 100K IVSL 100K OVX 100 20K OVH (20) 220p OVSG 1.5K PTC 100 OR1 1K VR5 10.01K VR4 VR3 (25) 101K VR2 1.111M TEST5 ACVL ACVH ADI (30) 0.1 ADO 22n 3.9K OHMC4 220n OHMC3 + 1 330n OHMC2 88M 47n OHMC1 (35) D2 NC 4.7 VRH VR 91K 4.7 10K +
10 + 0.1
BKLIT NC (100) MAX/MIN KEY REL_ZERO RANGE HOLD (95) ANNUNC BP1 BP2 BP3 BP4 (90) SEG01 SEG02 SEG03 SEG04 SEG05 (85) SEG06 SEG07 SEG08 SEG09 SEG10 (80) SEG11 SEG12 SEG13 SEG14 SEG15 (75) SEG16 SEG17 SEG18 SEG19 SEG20 (70) SEG21 SEG22 SEG23 SEG24 SEG25 SEG26
ES51921
9K + 1 2.2 1K VmV 1.5K PTC
LCD display
...
Fin Notes: 1. Most of pins are protected by the ESD protection circuits. However pins, V+, V-, AGND, DGND and VR1 are not protected enough because the parasitic effect must be decrease. Therefore enough external protection is needed for assembling, carrying and keeping. In addition, components connecting to these unprotected pins have to be soldered on board before the IC is soldered. 2. Cp is the compensation capacitor for measuring capacitance. Its value depends on the parasitic capacitor on the PCB board. 3. Light shielding for the diodes and Zeners.
SEG27 SEG28 SEG29 SEG30 (60) NC FREQ SLEEP 200 BUZIN LPFC3 22n (55) LPFEN LPFOUT LPFC2 4.7n 1n LPFC1 NC (50) NC R1K R9K CA+ 470n CA(45) VBAR 10M VR1 V220m 100K VAVA+ (40) ADP SGND 1815
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7.1 Appendix: Average rectified circuit
1
2
3
4
ES51922 Average Circuit
D D
Type ( I )
VR1 C 2K R1 C1 3K 0.1uF TEST5 ADI
Type ( II )
VR1 2K R1 6.2K C1 10uF TEST5 ADI R2 7.5K C2 1uF + R3 7.5K C +
R2 3.9K
+ C2 + D2 1uF
C3 1uF
R3 3.9K
R4 88M
D1 1N4148
ACVH C4 4.7uF ADO ACVL
D1 1N4148
D2 IN4148
ACVH ADO ACVL B
IN4148
B
A
Title Size A4 Date: File: 1 2 3 13-Jun-2007 D:\Protel file\ES51922 Serial.ddb Sheet of Drawn By: 4 Number Revision
A
Note: 88M resistors could be omitted at Type(II) circuit
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8. Package
1. 128L QFP Topview
2. Dimension Parameters
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