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ES51925
3000 Counts Smart DMM
Features
3000 counts LCD display 3V DC power supply Conversion rate: 4 times/s (voltage mode) Full automatic measurement: *Voltage/Current: AC/DC auto scanning & auto range: 3.000V~1000V *Resistance/Diode/Capacitance(RDC scan) Auto scanning & auto range: Resistance: 300.0~3.000M Capacitance: 3.000nF~300.0uF Push functions Function selection by single key Range change function Hold function VAHZ function Back light function Support non-contact voltage detection High voltage (> 30V) indication of LCD display for voltage measurement Built-in HCF(high crest factor detection) function in AC mode OL level selection (600V/1000V/1500V) Band-gap reference voltage output Auto power off (3min. or 10min.) & repower on Sleep output indication On-chip buzzer driver Low battery detection ES51925 is an integrated ADC with 3000 counts LCD display driver. It could support fully automatic DMM function measurement. In voltage or current mode, the AC or DC signals auto scanning. In R/D/C (passive component) mode, resistance (including continuity), capacitance or diode measurements are allowed by fully automatic detection. A single key and simple switch could select all measurements. Expensive and bulky mechanical range switches are not required. A non-contact electric field detector (EF mode) is built-in for ac voltage measurement also. Other features including range control, data hold, VAHz and back light function are available. For power saving, an auto power off & re-power on scheme are built-in. A sleep output is the indication of entering auto power off mode.
General description
Application
Smart digital multi-meter Smart clamp meter
Ver 2.7
1
07/10/03
ES51925
3000 Counts Smart DMM
Pin Assignment
70
65
60
55
SEG12 SEG13 SEG14 SEG15 CLAMP VON AON FA FUA FC3 FC2 FC1 HOLD SEL VAHZ RANGE NC BKLIT EFEN BP1 BP2 BP3 BP4 ANNUNC BKOUT 75 50
10
15
20
Pin Description
Pin No
1 2
Symbol
AGND LBAT
3 4 5 6 7 8 9 Ver 2.7
CREF+ CREFCINT CAZ BUFF RAZ IVSH
AGND LBAT CREF+ CREFCINT CAZ BUFF RAZ IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC4 OHMC3
Type
P I
Description
Analog ground. Low battery configuration. If 3V battery is used, connect it to DGND. The default low-battery threshold voltage is -2.3V. If 9V battery is used, the low battery enunciator is displayed when the voltage of this pin is less than VRH (-1.2V) Positive connection for reference capacitor. Negative connection for reference capacitor. Integrator output. Connect to integral capacitor Auto-zero capacitor connection. Buffer output pin. Connect to integral resistor Buffer output pin in high-speed mode. Connect to high-speed integral resistor. High current measurement input. 2 07/10/03
I/O I/O O I O O I
25
5
SEG11 SEG10 NC NC SEG09 SEG08 SEG07 SEG06 SEG05 SEG04 SEG03 SEG02 SEG01 OSC2 OSC1 BKSEL CESEL C+ CVVV+ V+ DGND AGND
80
45
85
Cyrustek. com.tw
40
90
ES51925
35
95
30
100
NC NC NC NC NC ACEN BUZOUT APOSEL BUZIN SLEEP R1K R9KCA+ CANC VR1 VAVA+ ADP SGND VR VRH NC OHMC1 OHMC2
ES51925
3000 Counts Smart DMM
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 - 50 51 52 IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC4 OHMC3 OHMC2 OHMC1 NC VRH VR SGND ADP VA+ VAVR1 NC CACA+ R9K R1K SLEEP BUZIN APOSEL BUZOUT ACEN NC BKOUT ANNUNC I I I I O O O O O I/O I I I O O O O O O I I I I I I I/O I/O O O O I I O O O O Low current measurement input Input high voltage for resistance/capacitor measurement Output connection for resistance/capacitor measurement Sense low voltage for resistance measurement Reference resistor connection for 300.0 range Voltage measurement /10000 attenuated (1000V) Voltage measurement /1000 attenuated (300.0V) Voltage measurement /100 attenuated (30.00V) Voltage measurement /10 attenuated (3.000V) 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 -1.2V Reference input voltage connection. Typically -400mV Signal Ground. Measurement input in ADP mode 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+. Measurement input. Negative auto-zero capacitor connection for capacitor measurement 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. Sleep mode indicator, asserts low in SLEEP mode. Normal V+ output. Pull to V- to enable the BUZOUT. Auto power off idle time selection. Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer Output to V- when AC mode inactive and output to V+ in AC mode. 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. 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 back plane to turn it off. LCD backplane 4 LCD backplane 3 LCD backplane 2 LCD backplane 1 Pull-low to enable non-contact AC voltage detection Back light function. Pulse low to set BKOUT pin output. Pulse to V- to enable manual mode and manual range selection. 3 07/10/03
53 54 55 56 57 58 59 60 Ver 2.7
BP4 BP3 BP2 BP1 EFEN BKLIT NC RANGE
O O O O I I I
ES51925
3000 Counts Smart DMM
61 62 63 64 65 66 67 68 69 70 71 72 - 77 78 - 79 80 - 88 89 90 91 92 93 94 95 96 97 98 99 100 VAHz SEL HOLD FC1 FC2 FC3 FUA FA AON VON CLAMP SEG15 - 10 NC SEG09 - 01 OSC2 OSC1 BKSEL CESEL C+ CVVV+ V+ DGND AGND I I I I I I I I I I I O O I O Pulse to V- to enable VAHz mode. Pulse to V- to select target measurement Pulse to V- to enable HOLD function. Switch 1 for function selection. Switch 2 for function selection. Switch 3 for function selection. Switch 1 for current measurement selection. Switch 2 for current measurement selection. Pull to high to sense current measurement priority in auto scan mode Pull to high to sense voltage measurement priority in auto scan mode Switch for clamp meter application function LCD segment line 10 - 15
LCD segment line 01 - 09 Crystal oscillator input connection Crystal oscillator output connection When pulled to V-, an auto back light configuration is allowed. Configure a low level applied to BKLIT larger than 1 second, the I BKOUT will be active. If BKLIT is back to high level, the BKOUT would be inactive. I OL selection feature control pin. O Positive capacitor connection for on-chip DC-DC converter. O Negative capacitor connection for on-chip DC-DC converter. P Negative supply voltage. Connecting to battery negative terminal. P Negative supply voltage. Connecting to battery negative terminal. P/O Output of on-chip DC-DC converter. P/O Output of on-chip DC-DC converter. G Digital ground. G Analog ground.
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
Ver 2.7
4
07/10/03
ES51925
3000 Counts Smart DMM
Electrical Characteristics
TA=25, V- = -3V
Parameter Power supply Operating supply current In Scan AC/DC mode Voltage roll-over error Voltage nonlinearity Input Leakage Low battery flag voltage Zero input reading Peak to peak backplane drive voltage Counter time base period Reference voltage and open circuit voltage for 300 measurement Open circuit voltage for measurement (except 300) Symbol Test Condition VIDD Normal operation ISS In sleep mode REV 10M input resistor Best case straight NLV line V- to AGND 10M input resistor -3.5V V -2.2V fOSC = 4MHZ 100K resistor between VRH and AGND and Continuity Mode Between V- pin and HOLD, RANGE, SEL,FC1-3,FUA, FA, VON, AON, CLAMP, BKLIT 1% 5% VR1(10M input impedance) ADP, IVSL and IVSH Parasitic capacitance allowed in 3.000M range Forward voltage Min. -3.5 -- -- -- -- -10 -2.4 -000 3.0 -- -1.33 -0.86 Typ. -3.0 2.5 0.6 -- -- 1 -2.3 000 3.15 1 -1.23 -0.78 Max -2.5 -- 2.5 0.1 0.1 10 -2.2 +000 3.3 -- -1.13 -0.70 Units V mA A %F.S1 %F.S PA V counts V sec V V
VREF
Internal pull-high to 0V current AC frequency response at 6.000V Range AC input response for scan mode AC/DC voltage scan mode sensitivity@1kHz AC/DC current scan mode sensitivity@1kHz RDC scan mode RES sensitivity
--
1.2
--
A
-- -- 10 300 8 -- -- 400 -- -1.5 -5 -2.0 -5
40-400 -- 400-2000 -- -- 50000 400 10 -- 0.8 -- 50 -- -- -- -- 500 12 200 -- -- -- 1.5 5 2.0 5
HZ Hz mV mV pF V pF ppm/ %F.S counts %F.S counts
RDC scan mode DIODE sensitivity RDC scan mode CAP sensitivity Reference voltage temperature 100K resister coefficient TCRF Between VRH 0Note: 1.Full Scale
Ver 2.7
5
07/10/03
ES51925
3000 Counts Smart DMM
Functional Description
1. Operation 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 VR1 VR2 VR3 VR4 VR5 Full Scale Range 300.0mV* 3.000V** 30.00V 300.0V 1000V*** Divider Ratio 1 1/10 1/100 1/1000 1/10000 Resister Connection VR1 (10M) VR2 (1.111M) VR3 (101K) VR4 (10K) VR5 (1K)
Note: * Exists in manual mode only by RANGE key control **This range is the default range for auto range & auto scan mode *** Depends on CESEL selection 1.1.1 OL selection ES51925 has a OL display selection feature archived by configuring a CESEL pin. If pin CESEL is connected to V-, ES51925 will have a 600.0V overflow level in DCV and ACV mode. If pin CESEL is connected to DGND, the ES51925 will have a 1010V overflow level in DCV mode and have a 1010V overflow level in ACV mode also. When CE is floating, a 1500V overflow level in DCV mode but ACV is still 1010V overflow level. The meter will Show OL when the measuring signal reaches the overflow level with beeper warning. The configuration of CESEL is listed below.
CESEL VDGND Floating
DCV 600.0V 1010V 1500V
ACV 600.0V 1010V 1010V
Ver 2.7
6
07/10/03
ES51925
3000 Counts Smart DMM
1.1.2 HCF detection ES51925 provides detection of high-crest-factor (HCF) signal in ACV auto range mode. ES51925 senses the signal and determines it as HCF if the Vpp is large enough. Once the signal is determined as HCF, ES51925 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 Vpp=200V, Vrms=40V(CF=5) was applied, traditional DMM might stay at 30V 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 300V range and exhibits more accurate results.
1.1.3 EF mode ES51925 supports a non-contact ac voltage measurement, which is called electric field measurement also. The EF mode is selected by SEL key when EF_EN is active. The ADC input is configured from ADP pin vs. SGND. When no or less electric field is detected, the LCD shows "EF". If the detector senses electric field, the strength will be showed on LCD by "-" not digits type. Level 1(weak) is "-" and the level 4(strong) is "----". Additional beeper will be output from BUZOUT pin. The buzzer frequency depends on the strength of electric field also. The Faster beeper means the stronger electric field (ac voltage) is sensed.
Ver 2.7
7
07/10/03
ES51925
3000 Counts Smart DMM
1.2 Current Measurement
1.2.1 For multi-meter application ES51925 has 2 automatic and 1 manual current measurement modes for multimeter. The following table summarizes the full-scale range of each mode. When ES51925 operates in the current measurement modes for multi-meter, it takes high input from pin IVSH or IVSL, low input from pin SGND and reference voltage from pin VR.
Mode Automatic1 Automatic2 Manual
Full Scale 300.0A / 3000A 30.00mA / 300.0mA 30.00A
Input Terminal IVSL/IVSH V.S. SGND IVSL/IVSH V.S. SGND IVSH V.S. SGND
Full scale 150.0mV 150.0mV 150.0mV
1.2.2 For clamp meter application ES51925 has 2 automatic and 4 manual current measurement modes for Clamp meter. The following table summarizes the full-scale range of each mode. When ES51925 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 ES51925 operate in the manual mode1~4, it takes high input from ADP, low input from SGND and reference voltage from VA+ & VA-.
Mode Automatic1 Automatic2 Manual1 Manual2 Manual3 Manual4
Full Scale 300.0A / 3000A 30.00A / 300.0A 3.000A 30.00A 300.0A 3000A
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
Full scale 300.0mV 300.0mV 300.0mV 300.0mV 300.0mV 300.0mV
Ver 2.7
8
07/10/03
ES51925
3000 Counts Smart DMM
1.3 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.
Configuration OR1 OR2 OR3 OR4 OR5 OR6 Full Scale Range 300.0* 3.000K 30.00K 300.0K 3.000M 30.00M** Relative Resistor OR1 VR5 VR4 VR3VR1 VR2VR1 VR1 Equivalent value 100 1K 10K 100K 1M 10M
Note: * When auto scan mode is set, continuity check is implemented in this range ** When auto scan mode is set, the 30.00M range is omitted
1.3.1 Continuity check Continuity check shares the same configuration with 300.0 manual resistance measurement mode and has buzzer output to indicate continuity. The buzzer generates 2KHz beep whenever the reading is less than 30.
1.4 Diode Measurement Diode measurement mode shares the same configuration with 3.000V manual voltage measurement mode and has buzzer output to indicate continuity. The buzzer generates a 2KHz sound whenever the reading is less than 30mV. If the test circuit is open or the voltage drop between the two ports of the device (diode) under test is larger than 2V, the LCD panel will show "OL".
Ver 2.7
9
07/10/03
ES51925
3000 Counts Smart DMM
1.5 Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode:
Configuration C1 C2 C3 C4 C5 C6 C7 C8 Full Scale Range 3.000nF 30.00nF 300.0nF 3.000uF 30.00uF 300.0uF 3.000mF* 30.00mF** Relative Resistor 20kVR+100k 20kVR+100k 101k 10k R9K / R1K R9K / R1K R9K / R1K R9K / R1K
Note: * & ** The C7-C8 both range is not available for auto scan mode 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" Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some other apparatus.
1.6 Auto power off mode (APO) 1.6.1 Idle Time selection ES51925 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 3 minutes. If pin APOSEL is connected to DGND or floating, the Idle Time will be set to 10 minutes. When APO happens, the state of the meter is saved. If the APO is necessary to be cancelled, power on the ES51925 when any of the push key, except for HOLD, is pressed down simultaneously.
Ver 2.7
10
07/10/03
ES51925
3000 Counts Smart DMM
1.6.2 Sleep output The meter enters sleep mode after auto power-off or push SEL key to last for 2s. The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V) after re-power on.
1.6.3 Re-power on After auto power-off is active, pushing any of the push function or changing the measurement function can turn on the meter again. If the meter is re-powered on by changing measurement function, the saved state is cleared. If the meter is repowered on by push functions, the chip restores the saved state and enters HOLD mode. The LCD displays the saved value except for the auto scan mode.
Ver 2.7
11
07/10/03
ES51925
3000 Counts Smart DMM
2. Functional Modes Table
Measurement mode depends on the logic level of FC1, FC2, FC3, FUA, FA, VON, AON and CLAMP.
FC1 1 1 1 1 1 1 1 0 0 0 1 1 FC2 FC3 FUA FA VON AON CLAMP X 0 X X X 0 0 X 0 1 0 X 1 0 X 0 0 0 X 1 0 X 0 0 1 X 1 0 X 0 X X 1 X 1 X 0 1 0 0 X 1 X 0 0 0 0 X 1 1 0 X X X X X 0 1 X X 0 X 1 1 1 X X 0 X 1 0 1 X X 0 X 1 1 1 X X 0 X 1 Functional Mode(pushing SEL key) VAUTO VAC VDC EF* VAUTO ... IAUTO IAC IDC IAUTO ...(uA) IAUTO IAC IDC IAUTO ...(mA) IAUTO IAC IDC IAUTO ...(A) VAUTO VAC VDC VAUTO ... IAC(300.0A/3000A) IAC(30.00A/300.0A) RDCAUTO R D C RDCAUTO ... IAUTO IAC IDC IAUTO ...(3.000A) IAUTO IAC IDC IAUTO ...(30.00A) IAUTO IAC IDC IAUTO ...(300.0A) IAUTO IAC IDC IAUTO ...(3000A) Input VR1,ADP IVSH/IVSL IVSH/IVSL IVSH VR1 IVSH/IVSL IVSH/IVSL VR1 ADP ADP ADP ADP
Note: * EF mode could be selected when EF_EN is active.
3.
Push Function All the enabled push functions will be reset when the measurement mode is changed by external switch. Change measurement mode by SEL function will reset enabled RANGE, HOLD, and VAHz functions. The following table lists the available function versus every measurement mode. SEL RANGE HOLD VSCAN O X X VAC O O O VDC O O O EF O X X ISCAN O X X IAC O O* O IDC O O* O RDCSCAN O X X Resistance O O O Continuity O X O Diode O X O Capacitance O O O Note: For ADP input, RANGE is not available VAHz O O O X O O O X X X X X BKLIT O O O O O O O O O O O O
Ver 2.7
12
07/10/03
ES51925
3000 Counts Smart DMM
3.1 Select function When power on or SEL key is pressed longer than one second, ES51925 will be power-on reset to auto scan mode, which scanning mode is determined by [FC1FC3] function set. In auto scan mode, the ES51925 automatically selects the appropriate measurement mode and range. Pushing the SEL key less than one second could select the target measurement function. Pushing the key larger than two seconds, the ES51925 will enter power down mode. If power down mode is entered, only press SEL key to last for one second or apply the power to Vterminal could re-power on the ES51925. The following figure shows the state transition.
Push SEL key < 1s V/A ac/dc auto scan AC mode measurement DC mode measurement EF* mode measurement
Push SEL key > 1s Power on reset
Push SEL key > 2s
enter power down mode
R/D/C auto scan
Resistance measurement
Continuity measurement Push SEL key < 1s
Diode measurement
Capacitance measurement
Note: * Available when EF_EN is active only
Ver 2.7
13
07/10/03
ES51925
3000 Counts Smart DMM
3.2 Range function 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
3.3 Hold and delay-hold function The data hold mode makes the meter stop updating the LCD panel. This mode can be nested in most of the special modes. In auto scanning mode, the HOLD key is not available. Enabling hold function in automatic mode makes the meter switch to manual mode. Hold function can be cancelled by changing the measurement mode, pressing RANGE, or push HOLD again. The delay-hold function is enabled when HOLD key is pressed larger than 2 seconds. When delay-hold function is entered successfully, the meter will stop to update the LCD data after six seconds delayed. During the six seconds waiting, the HOLD symbol on LCD panel will be blinking. Push > 2s 6sec past
Normal mode Push < 2s HOLD mode (Auto/Manual) Push < 2s (Manual) Push > 2s Push < 2s Delay State (Auto/Manual)
Ver 2.7
14
07/10/03
ES51925
3000 Counts Smart DMM
3.4 VAHz function When voltage or current measurement mode is selected, the VAHz funtion is available. Push VAHz key to select this frequency measurement mode. The frequency is measured by auto ranging. The maximum frequency range is 100kHz. The sensitivity of signal input is 10% full scale of voltage or current mode typically.
Configuration FR1 FR2 FR3 Range 3.000KHz 30.00KHz 100.0KHz
3.5 Back light function When BKSEL is set to DGND or floating, push the BKLIT key to enable the back light output driving ON/OFF. If the auto back light configuration is active, the BKLIT becomes a control input for external light sensed circuit. Set to low for one second to active the back light output driving. Set to high then the driving output is inactive immediately.
BKSEL DGND or floating VConfiguration Normal back light function Auto back light function
Ver 2.7
15
07/10/03
ES51925
3000 Counts Smart DMM
4. Miscellaneous The conditions, 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 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 or power down by SEL key generates a 2KHz beeper 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
Ver 2.7
16
07/10/03
ES51925
3000 Counts Smart DMM
4.1 LCD configuration
S14 S12 S7 S8 S9 S10 S11 S15
APO
S1
S2
S3
S4
S5
S6
S13
BP1 BP2
SCAN AUTO MANU AC
HOLD
2 m2 V A n 1 m1 F M K Hz
BP3 DC BP4 BATT
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 BP1 SCAN AUTO BP2 AC BP3 DC BP4 BATT DP3 BP1 BP2 BP3 BP4 A1 F1 E1 D1 B1 G1 C1 A4 F4 E4 D4 2 m2 V A MANU B4 G4 C4 M K A3 F3 E3 D3 n 1 m1 F Hz HOLD B3 G3 C3 F2 E2 DP2 APO A2 G2 D2 B2 C2 DP1
SEG10 SEG11 SEG12 SEG13 SEG14 SEG15
Ver 2.7
17
07/10/03
ES51925
3000 Counts Smart DMM
LCD Backplane Waveform
V- +3.2
VV- +3.2
VV- +3.2
VV- +3.2
VV- +3.2
V-
4.2 LCD display on condition
LCD annunciates V A F Hz DC AC SCAN AUTO MANU 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 VAHZ frequency mode. In DC voltage or DC current mode. In AC voltage or AC current mode. When auto scan mode is selected When automatic full scale range selection is enabled. In manual mode. When the reading is exceeding 30V in DCV or ACV, the DNAGER symbol will be displayed on When HOLD function is enabled. When delay-hold is selected, the HOLD symbol will be blinking for 6 seconds. 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 When auto power off function is enabled.
HOLD m1 n m2 M K APO
1 2
Ver 2.7
18
07/10/03
ES51925
3000 Counts Smart DMM
Test Circuit
1. Voltage test
AGND OVSG 100 1K 10K 101K 1.111M D1 15K 10K 10K +4.7u D2 +1.0u 15K OR1 VR5 VR4 VR3 VR2 ADO ADI ACVL ACVH TEST5 A mA uA V R 1 10M -400mV Voltage input Z1 6V Z2 100 PTC 1.5K 10M 1.111M VR1 V R 450 0.005 0.495 mA 4.5 50 mA uA uA 100K 100K IVSH IVSL 30A
4. Current test
AGND SGND
5. Diode test
AGND OVH
2. Resistance test
22n 220n PTC 1.5K Z1 6V Z2 470n 47n 100 100 1K 10K 101K 1.111M OVX OHMC4 OHMC3 OHMC2 OHMC1 OVH OVSG OR1 VR5 VR4 VR3 VR2 SGND AGND
VR2 OVSG
6. Low battery
9V BA TT 270K 0V 680K LBAT9 0.1u AGND V-
3. Current test for clampmeter 7. EF test
EFin+ RL VR R 100K ADP SGND AGND
400mV 100k 60M ADP SGND AGND VA+ VA-
EFin-
Ver 2.7
19
07/10/03
ES51925
3000 Counts Smart DMM
Application Circuit
a.) AC average rectified circuit
1 2 3 4 5 6
VBT1 SW1 SW SPDT ZR1 R1 SW2 uA ZR3 C3 ZR2 C4 SW3 uA C1 10uF C2 0.1uF SW4 R3 mA 0.1uF ZR4 3V 5.6V 10uF
Y1
450
C5
+
0.47uF
4MHz
D
+
LCD Panel
J1 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 BP1 BP2 BP3 BP4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 CON19
D
CESEL BKSEL
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09
R2
45
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
U1
4.5
SW5 R4 30A 1 J2 R5 Gnd 1 J4 SW7 SW SPST VR1_10M R / C / D / Cont. 1 J3 C11 B 22nF ZR7 mA C7 C C8 R7 R8 IVSH R9 R10 IVSL 100K C6 220pF R17 1.5K PTC ZR8 R12 R13 R14 R15 R18 100 1K 10K 101K 1.11M TEST5 ACVL ACVH ADI ADO 220nF 220nF 220K 75K 100K 100K R11 VR1 20K 100 C9 0.1uF LBAT
AGND DGND V+ V+ VVCC+ CESEL BKSEL OSC1 OSC2 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 NC NC SEG10 SEG11
ZR5
ZR6 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 C13 220nF C14 C15 470nF 47nF
SEG10 SEG11
0.495
SW6 30A R6
0.005
OHMC2 OHMC1 NC VRH VR SGND ADP VA+ VAVR1 NC CACA+ R9K R1K SLEEP BUZIN APOSEL BUZOUT ACEN NC NC NC NC NC
AGND LBAT CREF+ CREFCINT CAZ BUFF RAZ IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC4 OHMC3
+
7.5V
+
ES51925
SEG12 SEG13 SEG14 SEG15 CLAMP VON AON FA FUA FC3 FC2 FC1 HOLD SEL VAHz RANGE NC BKLIT EFEN BP1 BP2 BP3 BP4 ANNUNC BKOUT
75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
SEG12 SEG13 SEG14 SEG15 CLAMP VON AON FA FUA FC3 FC2 FC1 HOLD SEL VAHZ RANGE BKLIT EFEN BP1 BP2 BP3 BP4 ANNUNC
C
Function Switch
VBKLIT RANGE VAHZ SEL HOLD SW8 SW_non lock SW9 SW_non lock SW10 SW_non lock SW11 SW_non lock SW12 SW_non lock FC3 FC2 FC1 EFEN FA FUA AON VON CLAMP SW13 SW_lock SW14 SW_lock SW15 SW_lock SW16 SW_lock SW17 SW_lock SW18 SW_lock SW19 SW_lock SW20 SW_lock SW21 SW_lock V-
B
VR2
10K
R16
10K C10
TEST5 4.7uF ADI C12 R23 1uF
+
R19
VR1_10M R20
C16
100K
+
R21 15K C17 D1 1N4148 1uF
R22 15K
27K VR3 VR
26 27 28 56K 29 30 31 32 VA+ 33 34 VA10M 35 36 37 470nF 38 39 40 41 42 43 44 45 46 47 48 49 50
APOSEL BUZIN SLEEP R26 9K VC18 ZR9 R25 1K 5.6V 10K
Average Circuit
D2 IN4148
ACVH ADP ADO ACVL 1 J5
R24
220nF BZ1 Buzzer
+
A
A Title Size B Date: File:
ES51925 3000 Counts Smart DMM
Number
Application Circuit ( Average )
Sheet of Drawn By: 6
Revision
30-Aug-2007 D:\Protel file\ES51928 Serial.ddb
1
2
3
4
5
Notes: 1. The ESD protection circuits protect most of pins. 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. All the zener diodes above are used for IC protection. These protections are needed and these zener diodes must be soldered on PCB first before soldering ES51925 on. 3. The OVX pin resistance have to be kept below 120k for the capacitance mode accuracy (3/30nF range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.7
20
07/10/03
ES51925
3000 Counts Smart DMM
b.) AC RMS circuit
1 2 3 4 VBT1 3V 5.6V 10uF 0.1uF ZR4 uA 5 6
J1 D SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 BP1 BP2 BP3 BP4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 CON19
C3 SW SPDT ZR1 R1 ZR2 C4 SW3 uA C1 10uF C2 0.1uF SW4 R3 mA U1
Y1
450
C5
+
0.47uF
4MHz
LCD Panel
SW1
SW2
ZR3
+
D
CESEL BKSEL
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09
R2
45
4.5
SW8 R4 30A 1 J2 VGnd R5 mA C7 C8 R8 R9 IVSH R10 IVSL R11 100K C6 220pF R7 ZR7 1.5K PTC ZR8 R13 R14 R15 R16 R17 100 1K 10K 101K 1.11M ACVL ACVH ADO 220nF 220nF 220K 75K 100K 100K R12 VR1 20K SW10 SW SPST VR1_10M R / C / D / Cont. 1 J4 100 C9 0.1uF LBAT
AGND DGND V+ V+ VVCC+ CESEL BKSEL OSC1 OSC2 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 NC NC SEG10 SEG11
ZR5
ZR6 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 C14 220nF C15 470nF 47nF
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
SEG10 SEG11
0.495
SW9 30A R6
Function Switch
C
0.005
1 J3
BKLIT RANGE VAHZ SEL HOLD
SW5 SW_non lock SW6 SW_non lock SW7 SW_non lock SW11 SW_non lock SW12 SW_non lock
ACV / RMS
SW_lock
C12 22nF
B VR18 CLAMP VON AON FA FUA FC3 FC2 FC1 EFEN SW13 SW_lock SW14 SW_lock SW15 SW_lock SW17 SW_lock SW18 SW_lock SW19 SW_lock SW20 SW_lock SW21 SW_lock SW22 SW_lock -VS_ES7 C18 +VS_ES7 C19 + 10uF ES7_PWR
-VS_ES7
VR2
500K
+VS_ES7 C16
26 27 28 56K 29 30 31 32 33 VA+ 34 VA10M 35 36 37 470nF 38 39 40 41 42 43 44 45 46 47 48 49 50
TRMS Circuit
OHMC2 OHMC1 NC VRH VR SGND ADP VA+ VAVR1 NC CACA+ R9K R1K SLEEP BUZIN APOSEL BUZOUT ACEN NC NC NC NC NC
SW16
AGND LBAT CREF+ CREFCINT CAZ BUFF RAZ IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC4 OHMC3
+
7.5V
+
ES51925
SEG12 SEG13 SEG14 SEG15 CLAMP VON AON FA FUA FC3 FC2 FC1 HOLD SEL VAHz RANGE NC BKLIT EFEN BP1 BP2 BP3 BP4 ANNUNC BKOUT
75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
SEG12 SEG13 SEG14 SEG15 CLAMP VON AON FA FUA FC3 FC2 FC1 HOLD SEL VAHZ RANGE BKLIT EFEN BP1 BP2 BP3 BP4 ANNUNC
C
B
ES7_PWR APOSEL BUZIN SLEEP
R22
1 2 3 4 R19 150 R20 47K
RL COM Vin + VS PwrDown Vout - VS Cav U2 C10 ES7 2.2uF
8 7 6 5
ACVH R21 27K VR3 VR 10K
100K
C13
1uF
VR1_10M R23
+
C17
10K
R24 9K V-
2.2uF ADO VR4 50K C20 1uF ADP 1 J5
R25
C21 220nF R26 1K
+ C11
+
ZR9
5.6V BZ1 Buzzer
A
1
Notes: 1. The ESD protection circuits protect most of pins. 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. All the zener diodes above are used for IC protection. These protections are needed and these zener diodes must be soldered on PCB first before soldering ES51925 on. 3. The OVX pin resistance have to be kept below 120k for the capacitance mode accuracy (3/30nF range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.7
+
10uF
A Title Size B Date: File: 2 3 4 5
ES51925 3000 Counts Smart DMM
Number
Application Circuit ( TRMS )
Sheet of Drawn By: 6
Revision
30-Aug-2007 D:\Protel file\ES51928 Serial.ddb
21
07/10/03
ES51925
3000 Counts Smart DMM
Package Information
7.1
100 Pin LQFP Package
7.2
Dimension Parameters
Ver 2.7
22
07/10/03

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