ES51932 [CYRUSTEK]
22,000 Counts Auto DMM; 22000自动计数数字万用表
| 型号： | ES51932 |
| 厂家： | 
Cyrustek corporation |
| 描述： | 22,000 Counts Auto DMM |
| 文件： | 总35页 (文件大小：465K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ES51932
22,000 Counts Auto DMM
• Programmable LCD segment display
Features
• Support a selectable low pass filter 3dB
bandwidth for ACV & ACA measurement
(Taiwan patent no.: 362409)
• 22,000 counts LCD driver with 46-segment
bargraph display
• Conversion rate : 2 times/s
• Full automatic measurement
*Voltage measurement:
(China patent no.: 1363073)
• SHIFT function
• High-crest-factor signal detection
(Taiwan patent no.: 234661)
Manual 220.00mV / Auto 2.2000V – 1000.0V /
Auto 220.00 – 1000.0V
• 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
*Current measurement: μA/mA/A
*Resistance measurement:
220.00Ω – 220.00MΩ
*Capacitance measurement:
22.000nF – 220.00mF(25sec)
(Taiwan patent no.: 323347, 453443)
• On-chip buzzer driver
*Frequency counter
• 3V DC power supply
22.00Hz – 220.00MHz
• Low battery detection for 3V or 9V battery
• Current modes for clamp meter
• Duty cycle measurement (5.0% ~ 94.9%)
• Diode measurement & continuity check
• ADP mode with independent reference voltage
Description
ES51932 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 peak detection with calibration mode,
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.
• Temperature mode with internal scale translation
circuit from oC to oF
• Push functions
*Range change function
*VAHZ function
*Peak Hold with automatic calibration
(Taiwan patent no.: 476418)
*Relative function
*Zero function in manual DCA mode
*Data hold function with delay hold feature
*MAX/MIN function
*Back-light function
*KEY function
Ver. 1.2
1
10/05/27
ES51932
22,000 Counts Auto DMM
Application
Digital multimeter
Clamp meter
Thermometer
Pin Assignment
LQFP-128L
1
2
3
4
D
D
C
B
A
103
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
VAHZ
104
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
FREQ
SLEEP
BUZIN
LPFC3
LPFOUT
LPFC2
LPFC1
PMAX
PMIN
R1K
R9K
CA+
CA-
VBAR
VR1
V220m
VA-
VA+
ADP
SGND
BUZOUT
105
BKOUT
106
OSC2
107
OSC1
108
SCLK
109
SDATA
uPLCD
110
C
B
A
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
RS232
APOSEL
BKSEL
VST
SHIFT
CESEL
SLACDC
FC5
FC4
FC3
FC2
FC1
SDO
C+
C-
V-
V-
LBAT9
ES51932
1
2
3
4
Ver. 1.2
2
10/05/27
ES51932
22,000 Counts Auto DMM
Pin Description
Pin No
1
Symbol
V+
V+
Type
O
O
Description
Output of on-chip DC-DC converter.
Output of on-chip DC-DC converter.
2
3
4
5
6
DGND
AGND
AGND
CH+
P/G Digital ground. Connecting to 3V battery positive terminal.
P/G Analog ground.
P/G Analog ground.
IO Positive connection for reference capacitor of high-speed A/D.
IO Negative connection for reference capacitor of high-speed A/D.
7
CH-
8
9
CIH
O
O
O
High-speed integrator output. Connect to integral capacitor.
High-speed buffer output pin. Connect to integral resistor.
High-speed auto-zero capacitor connection.
BUFFH
CAZH
CL+
CL-
CIL
CAZL
BUFFL
RAZ
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
IO Positive connection for reference capacitor of high-resolution A/D.
IO Negative connection for reference capacitor of high- resolution A/D.
O
O
O
O
I
I
I
I
O
O
O
O
O
O
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 2200μA, 220mA and 22A modes.
Current measurement input for 220μA, 22mA.
Input high voltage for resistance measurement
Output connection for resistance measurement
Sense low voltage for resistance measurement
Reference resistor connection for 220.00Ω 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)
IO Test pin
O
DC signal low input in ACV/ACA mode. Connect to negative output
of external AC to DC converter.
29
ACVH
O
DC signal high input in ACV/ACA mode. Connect to positive output
of external AC to DC converter.
30
31
32
33
34
35
36
37
38
39
40
41
ADI
ADO
I
O
O
O
O
O
-
O
I
G
I
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.
OHMC1
OHMC2
OHMC3
OHMC4
NC
VRH
VR
SGND
ADP
VA+
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-.
I
42
VA-
I
For ADP mode. De-integrating voltage negative input. The input
should be lower than VA+.
43
44
45
V220m
VR1
VBAR
I
I
I
Independent input terminal for AC/DC 220.00mV mode.
Measurement Input.
In temperature mode, it is used to control decimal point.
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign.
46
CA-
IO Negative auto-zero capacitor connection for capacitor measurement
Ver. 1.2
3
10/05/27
ES51932
22,000 Counts Auto DMM
47
48
49
50
51
52
53
54
55
56
57
58
CA+
R9K
R1K
IO Positive auto-zero capacitor connection for capacitor measurement
O
O
O
O
O
O
O
I
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Minimum peak hold output
PMIN
PMAX
LPFC1
LPFC2
LPFOUT
LPFC3
BUZIN
SLEEP
FREQ
Maximum peak hold output.
Capacitor C1 connection for internal low-pass filter
Capacitor C2 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Capacitor C3 connection for internal low-pass filter
Pull to V- to enable the BUZOUT.
I
O
I
Sleep mode indicator, asserts low in SLEEP mode.
Frequency counter input, offset V-/2 internally by the chip.
LCD segment line 01 – 32
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.
59 - 90 SEG32 – SEG01
O
O
O
O
O
O
91
92
93
94
95
BP4
BP3
BP2
BP1
ANNUNC
96
97
98
99
HOLD
RANGE
REL_ZERO
KEY
I
I
I
I
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.
Pulse to V- to enable Peak Hold mode.
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.
100
101
102
103
104
MAX/MIN
PEAK
BKLIT
VAHZ
BUZOUT
I
I
I
I
O
105
BKOUT
O
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.
106
107
108
109
110
OSC2
OSC1
SCLK
SDATA
μPLCD
O
I
I
I
I
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
111
112
113
114
RS232
APOSEL
BKSEL
VST
I
I
I
I
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.
115
SHIFT
I
Assert low to enable LCD SHIFT future, only works in 220MΩ, and
all capacitor measurement ranges
116
117
118
119
120
121
122
CESEL
SLACDC
FC5
I
I
I
I
I
I
I
CE selection feature control pin.
Select initial state.
Switch 5 for function selection.
Switch 4 for function selection.
Switch 3 for function selection.
Switch 2 for function selection.
Switch 1 for function selection.
FC4
FC3
FC2
FC1
Ver. 1.2
4
10/05/27
ES51932
22,000 Counts Auto DMM
123
124
125
126
127
128
SDO
C+
C-
V-
V-
O
O
O
P
P
I
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)
LBAT9
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage
V+
Rating
-4V
V- -0.6 to V+ +0.6
V+ ≥ (AGND/DGND+0.5V)
AGND/DGND
AGND/DGND ≥ (V- -0.5V)
V- -0.6 to DGND +0.6
500mW
Digital Input
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
0℃ to 70℃
-25℃ to 125℃
Electrical Characteristics
TA=25℃, V- = -3V
Parameter
Power supply
Operating supply current
In DCV mode
Symbol
V-
IDD
Test Condition
Min.
-3.5
—
Typ.
-3.0
2.0
2.5
—
Max
-2.5
2.5
5
Units
V
mA
Normal operation
In sleep mode
ISS
µA
—
±0.03 %F.S1
Voltage roll-over error
Voltage nonlinearity
REV 10MΩ input resistor
—
Best case straight
—
—
NLV
line
±0.03 %F.S
Input Leakage
Low battery flag voltage
Zero input reading
-10
-2.5
1
-2.3
000
10
-2.1
+000 counts
PA
V
V- to AGND
10MΩ input resistor -000
100KΩ resistor
Band-gap reference voltage
VREF between VRH and
-1.3
-1.2
-1.1
V
AGND
Peak to peak backplane
drive voltage
Counter time base period
-3.5V≤ V ≤-2.2V
3.0
3.1
1
3.2
V
fOSC = 4MHZ
—
—
sec
Between V- pin and
HOLD, RANGE,
KEY, FC1, FC2,
FC3, FC4, FC5,
BKLIT,MAXMIN
Between V- pin
and RS232
—
—
1.2
Internal pull-high to 0V
current
µA
V
—
—
—
—
11
Open circuit voltage for 220Ω
measurement
220Ω mode
-3.0
Ver. 1.2
5
10/05/27
ES51932
22,000 Counts Auto DMM
Open circuit voltage for Ω
measurement (except 220Ω)
Ω and Continuity
Mode
-0.58
-0.53
-0.48
V
Internal pull-low to V-
current
AC frequency response at 2.2000V
range
Between GND Pin
and SLACDC
±1%
1.5
µA
HZ
40-400
—
—
—
—
—
—
±5%
400-2000
—
100
—
3dB=Full (ADP)
3dB=10k (ADP)
3dB=1k (ADP)
—
10
1
kHz
kHz
kHz
3dB frequency for LPF mode
f3dB
—
Reference voltage temperature
coefficient
100KΩ resister
Between VRH
0℃<TA<70℃
—
—
ppm/℃
TCRF
TPW
75
Minimum pulse width for Peak
Hold feature
4MHz
crystal
100
µs
oscillator
—
—
—
—
-1.0
-10
-1.0
-10
-2.0
20
1.0
10
1.0
10
2.0
20
%
counts
%
counts
%
22nF – 220nF
Capacitance measurement accuracy2
2.2µF
22µF~220mF
counts
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
Input Pin
VR1
VR2
VR3
VR4
VR5
220.00mV1
2.2000V
22.000V
220.00V2
2200.0V
1
1/10
1/100
1/1000
1/10000
-
V220m V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
R2 / (R1+R2)
R3 / (R1+R3)
R4 / (R1+R4)
R5 / (R1+R5)
Note:
1. 220.00mV range is independent and manual mode. The input pin is different from other voltage
ranges.
2. 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.
Ver. 1.2
6
10/05/27
ES51932
22,000 Counts Auto DMM
1.1.2 CE selection
ES51932 has a CE selection feature archived by configuring a CESEL pin. If pin CESEL is connected to
V-, ES51932 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
V-
DGND
Floating
DCV
610.0
1010.0V
1500.0V
ACV
610.0V
1010.0V
1010.0V
1.1.3 HCF signal detection
ES51932 provides detection of high-crest-factor (HCF) signal in ACV mode. When this
function is enabled, ES51932 senses the signal and determines it as HCF if the Vpp is
large enough. Once the signal is determined as HCF, ES51932 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, ES51932 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. 1.2
7
10/05/27
ES51932
22,000 Counts Auto DMM
1.1.5 Low-pass filter feature
ES51932 provides a 3-order low-pass filter to reduce the influence of high frequency
noise. This LPF feature is available in ACV or ACA modes. Set FC5 to low in these
modes, the KEY button is used to activate the LPF feature. Press KEY button for less
than 1 second to select the 3dB bandwidth of LPF sequentially (Full/10kHz/1kHz) and
the relative LCD segment on LCD panel will be active also. When peak mode is active,
the LPF mode will be disabled temporarily.
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 220.00MΩ, 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 220.0MΩ instead of 220.00MΩ.
Configuration
OR1
Full Scale Range
220.00Ω
Divider Ratio
Resister Connection
R6
R5
100Ω
1KΩ
OR2
2.2000KΩ
OR3
22.000KΩ
10KΩ
R1∥ R4
OR4
OR5
OR6
OR7
220.00KΩ
2.2000MΩ
22.000MΩ
220.00MΩ
100KΩ
1MΩ
10MΩ
10MΩ
R1∥ R3
R1∥ R2
R1
R1
1.3 Current measurement for multimeter
ES51932 has 2 automatic and 1 manual current measurement modes for multimeter.
The following table summarizes the full-scale range of each mode. When ES51932
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
FC1~4
1,1,0,1
1,1,1,1
0,0,0,0
VBAR
Full Scale
Input Terminal
Automatic1
Automatic2
Manual
1
1
X
220.00µA / 2200.0µA IVSL/IVSH V.S. SGND
22.000mA / 220.00mA IVSL/IVSH V.S. SGND
22.000A
IVSH V.S. SGND
Note:
1. The typical connection of input terminal is as the schematic below:
Vin*
9R
IVSL
IVSH
100K
100K
R
Ver. 1.2
8
10/05/27
ES51932
22,000 Counts Auto DMM
1.4 Current measurement for clampmeter
ES51932 has 2 automatic and 4 manual current measurement modes for clampmeter.
The following table summarizes the full-scale range of each mode. When ES51932
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
ES51932 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
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
Full Scale
Input Terminal
0
0
X
X
X
X
220.00A / 2200.0A IVSL/IVSH V.S. SGND
22.000A / 220.00A IVSL/IVSH V.S. SGND
22.000A
220.00A
2200.0A
22000A
ADP V.S. SGND
ADP V.S. SGND
ADP V.S. SGND
ADP V.S. SGND
Note:
1. Connect VBAR to V- will disable the “µ2” / ”m2” symbol on LCD panel.
2. In DC current modes for clampmeter, ES51932 provides Zero function for offset removing.
3. The typical connection of input terminal for automatic1&2 is as the schematic below:
IVSL
IVSH
Vin*
RL
9R
R
Ver. 1.2
9
10/05/27
ES51932
22,000 Counts Auto DMM
1.5 Capacitance Measurement
The following table summarizes the eight ranges of capacitance measurement mode.
Configuration
Full Scale Range
22.000nF
Resistance Ratio
-
C1
C2
C3
C4
C5
C6
C73
C83
220.00nF
2.2000uF
22.000uF
220.00uF
2.2000mF
22.000mF
220.00mF
VR4
10kΩ
R9k/R1k
R9k/R1k
R9k/R1k
R9k/R1k
R9k/R1k
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.
1.6 Continuity Check
Continuity check shares the same configuration with 220.00Ω manual resistance
measurement mode, but with buzzer output to indicate continuity. The buzzer generates a
2KHz sound whenever the digit number is less than 30Ω.
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. When the LCD display counts are larger than 1.9000V, the OL will be
shown.
Ver. 1.2
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10/05/27
ES51932
22,000 Counts Auto DMM
1.8 Frequency counter
The time base of the frequency counter is derived from an external crystal oscillator by
4,000,000
Tcounter
=
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
2FR1
3FR2
FR3
FR4
FR5
Full Scale
22.00Hz1
220.0Hz1
22.000KHz
220.00KHz
2.2000MHz
22.000MHz
220.00MHz
FR6
FR7
NOTE:
1In the range FR1~FR2, the maximum counting number is 2200 counts.
2In the Range FR1, ES51932 will show 0.00Hz if the input frequency is less than 2.00Hz.
3In the Range FR2 (manual mode), ES51932 will show 0.0Hz if the input frequency is less than 20.0Hz..
1.8.1 Duty Cycle measurement
The duty cycle measurement is available in frequency mode with VAHz operation. Press
VAHZ key when frequency mode is in operation, the ES51932 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. 1.2
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10/05/27
ES51932
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-). ES51932 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
ES51932 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
kept 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:
Power on the meter while pressing HOLD and lasts 1 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.
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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 FC1
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
Function of KEY
DCV ↔ ACV
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
DCmV ↔ ACmV
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
Ω ↔ Continuity
Continuity ↔ Diode
Ω ↔ Continuity ↔ Diode
—
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
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
Voltage Measurement
Auto DC Current Measurement(µA)
Auto DC Current Measurement(mA)
322A DC Current Measurement(A)
DCmV 220.00mV
2Manual 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(µA)
Auto AC Current Measurement(mA)
322A AC Current Measurement(A)
ACmV 220.00mV
—
℃ ↔ ℉
Ω ↔ Diode
ACV ↔ DCV
ACµA ↔ DCµA
ACmA ↔ DCmA
ACA ↔ DCA
ACmV ↔ DCmV
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
—
2Manual AC 22.000A
Manual AC 220.00A
Manual AC 2200.0A
Manual AC 22000A
1ADP0(22000)
—
—
—
—
ADP1(2200.0)
ADP2(220.00)
ADP3(22.000)
ADP4(2.2000)
Temperature Measurement
Capacitance Measurement (Clamp)4
℉ ↔ ℃
—
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.
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When FC5=low, KEY is disabled and the measurement mode list is below.
SLACDC FC1
FC2
FC3
FC4
Mode
Push KEY to
select LPF 3dB
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
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
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
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
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
DC Voltage Measurement
Auto DC Current Measurement(µA)
Auto DC Current Measurement(mA)
322A DC Current Measurement(A)
DC 220.00mV
2Manual 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(µA)
Auto AC Current Measurement(mA)
322A AC Current Measurement(A)
AC 220.00mV
O
O
O
O
O
O
O
O
2Manual AC 22.000A
Manual AC 220.00A
Manual AC 2200.0A
Manual AC 22000A
1ADP0(22000)
ADP1(2200.0)
ADP2(220.00)
ADP3(22.000)
ADP4(2.2000)
Temperature Measurement (oF)
Capacitance Measurement (Clamp)4
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.
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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, Zero and Peak functions. The following table lists the available
function versus every measurement mode.
Function
Range
Hold
Max/Min
REL
Zero
Peak*
VAHz
Mode
Voltage
O
O
X
O
O
O
X
X
X
X
X
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
X
O
O
O
O
O
O
X
X
O
O
O
X
X
X
X
X
X
X
O
O
O
O
X
X
O
X
X
X
X
X
Current1
Current2
AC
O
DC
X
Resistance
Capacitance
Frequency
Duty cycle
Continuity
Diode
O
X
X
X
X
X
O
X
O
X
Temperature
ADP
O
X
O
X
Note:
Current1 includes Auto µA, Auto mA and 22A modes.
Current2 includes Manual 2.2A, 22A, 220A, 2200A and 22000A modes.
When PEAK mode is active, the LPF mode will be disabled temporarily.
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. ES51932 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.
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22,000 Counts Auto DMM
Push > 2s
Push < 2s
Push < 2s
Normal mode
(Auto/Manual)
HOLD mode
6sec past
(Manual)
Delay State
Push > 2s
Push < 2s
(Auto/Manual)
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
Manual
Mode
1 push > 1 sec
Range up
1 push < 1 sec
Measurement Mode
220.00mV(DC/AC)
Auto
VR1
Manual
VR1
Control Range
220.00mV
Initial Range
220.00mV
VRi → VRi + 1,
VR5 → VR2
VRi → VRi + 1,
VR5 → VR2
R1 → R2,
V(DC/AC)
VR2 – VR5
VR4-VR5
R1 – R2
2.2000V – 1010.0V
2.2000V – 1010.0V
2.2000V
Auto 220V/1010V
(Set VST to low)
220.00V
Auto µA(DC/AC)
220.00µA – 2200.0µA 220.00µA
22.000mA – 220.00mA 22.000mA
R2 → R1
R1 → R2
R2 → R1
R1－R2
Fixed
Auto mA(AC/DC)
22 A(DC/AC)
Fixed
R1 → R2,
R2 → R1
22.000A
22.000A
22.000A
Auto 22A/220A
(DC/AC)
R1 – R2
22.000A – 220.00A
R1 → R2
R2 → R1
Auto 220A/2200A
(DC/AC)
R1－R2
OR1 - OR7
C1 – C8
220.00A – 2200.0A
220.00Ω – 220.00MΩ
22.000nF – 220.00mF
2.2000μF – 220.00mF
220.00A
220.00Ω
22.000nF
2.2000μF
ORi → ORi + 1,
OR7 → OR1
Ci → Ci + 1,
C8 → C1
Ω
Capacitance
Ci → Ci + 1,
C8 → C3
fixed
Capacitance
(Clamp mode)
C3 – C8
Continuity
Diode
fixed
fixed
220.00Ω
2.2000V
220.00Ω
2.2000V
fixed
FRi → FRi + 1
FR7 → FR1
Frequency
FR1 – FR7
22.00Hz – 220.00MHz
22.00Hz
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)
〝REL〞active.
〝REL〞and〝H〞active.
The relative value
Hold the relative value
push REL
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
1push<1s
Original state
(Automatic/manual)
1 push>1 sec
1 push>1 sec
1push<1s
“MIN” active
min value
“Max” “MIN” blink
current value
“MAX” active
max value
1push<1s
Push HOLD
Push HOLD
Push HOLD
“MAX”“MIN” “H” blink
hold current value.
“MIN” “H” active
hold min value.
“MAX” “H” active
hold max value.
1push<1s
1push<1s
1push<1s
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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
〝REL〞active.
The relative value
Push Max/Min > 1s
Push Max/Min
〝REL〞and〝Max〞active.
〝REL〞and〝Min〞active.
〝REL〞〝Max〞〝Min〞
Maximum rel. value
Minimum rel. value
blink. Current rel. value
Push Max/Min
Push Max/Min
Push HOLD
Push HOLD
Push HOLD
〝REL〞,〝Max〞,
〝H〞active. Hold
max. rel. value
〝REL〞, 〝Min〞,
〝H〞active. Hold
〝REL〞〝, Max〞〝, Min〞,
〝H〞blink. Hold the
current rel. value
Push Max/Min
Push Max/Min
min. rel. value
Push Max/Min
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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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
Press Zero < 1s
State diagram for Zero + HOLD mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’Active
Press Zero < 1s
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 > 1s
Press Zero < 1s
Press Max/Min
‘Zero’ ‘Max’Active
‘Zero’ ‘Min’Active
‘Zero’ ‘Max’ ‘Min’ blink.
Current DN+K - DN Value
Max. DN+K - DN Value
Min. DN+K - DN
Press Max/Min < 1s
Press HOLD
Press HOLD
Press HOLD
‘Zero’ ‘Max’ ‘Min’ ‘Hold’ blink.
Hold Current DN+K - DN Value
‘Zero’ ‘Max’ ‘Hold’Active
Hold Max. DN+K - DN Value
‘Zero’ ‘Min’ ‘Hold’Active
Hold Min. DN+K - DN Value
Press Max/Min < 1s
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3.8 Peak + HOLD
Peak mode takes input from Pmax or Pmin pin. The peak values are stored in external
capacitors. Polyster mylar capacitors are recommended. The precision of Peak mode
measurement can be enhanced by calibration. Calibration for Peak mode is invoked by
pressing Peak bottom for more than 2 seconds. Entering Peak mode will automatically
execute peak calibration, if peak calibration was never done before. The Calibration
process measures and stores the offset voltage of internal operation amplifiers. High
precision is achieved by substracting this offset from reading. When power off the
ES51932 or switch the measurement mode to °F temperature mode, the calibrated
offset value will be cleared. ES51932 will automatically execute peak calibration, if
peak mode was activated again after the calibrated offset value was cleared.
CALIBRATION
CALIBRATION
1 push > 2 s
1 push > 2 s
End
Original State
(Auto/Manual)
1 push > 1 s
1 push < 1 s
Done
No
Already calibrated
Yes
〝Pmax〞active.
〝Pmin〞active.
1 push < 1 s
1 push < 1 s
Max. Peak Value
Min. Peak Value
push HOLD
push HOLD
〝Pmax〞〝, HOLD〞active.
〝Pmin〞〝, HOLD〞active.
Max. Peak Value
Min. Peak Value
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
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22,000 Counts Auto DMM
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
p
P 1
D0 ~D6
0
-3V
LSB
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.
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
Measurement Mode
Voltage
VBAR=0
VBAR=1
0111011
0111101
0111111
0110000
0111001
0110011
Don’t care
Auto µA Current
Auto mA Current
22 A current
Manual A Current
Ω
Auto µA Current
Auto mA Current
Auto 220.00A/2200.0A
Auto 22.000A/220.00A
0110101
0110001
0110010
0110110
0110100
0111110
Continuity
Don’t care
Diode
1Frequency
Capacitance
2Temperature
ADP
1. 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.
2. 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.
3. 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.
Ω
Code
V
*2-range auto A
22 A Manual A ADP
Frequency Capacitor
0110000 2.2000V Lower Range(IVSL) 22.000 A 2.2000A ADP4 220.00Ω 22.00Hz 22.000nF
0110001 22.000V Higher Range(IVSH)
0110010 220.00V
0110011 2200.0V
0110100 220.00mV
0110101
22.000A ADP3 2.2000KΩ 220.0Hz 220.00nF
220.00A ADP2 22.000KΩ 2.2000µF
2200.0A ADP1 220.00KΩ 22.000KHz 22.000µF
22000A ADP0 2.2000MΩ 220.00KHz 220.00µF
22.000MΩ 2.2000MHz 2.2000mF
0110110
220.00MΩ 22.000MHz 22.000mF
0110111
220.00MHz 220.00mF
*It includes auto µA, mA, 22.000A/220.00A, 220.00A/2200.0A.
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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
Code
0
1
2
3
4
5
6
7
8
9
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
1
1
Judge
BIT 3
Sign
BIT 2
BATT
BIT1
OL
BIT 0
BIT6
BIT 5
BIT 4
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
1
1
MAX
BIT 3
MIN
BIT 2
REL
BIT 1
RMR
BIT 0
BIT 6
BIT 5
BIT 4
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4.6 OPTION 2
0
1
1
UL
PMAX
PMIN
0
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT1
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%.
If PMAX field is 1, PMAX is active and LCD panel display maximum peak value.
If PMIN field is 1, PMIN is active and LCD panel display minimum peak value.
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
1
1
DC
BIT 3
AC
BIT 2
AUTO VAHZ
BIT 1 BIT 0
BIT 6
BIT 5
BIT 4
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. The default value of LPF0/LPF1
bit are all “HI”. When the low-pass-filter feature is activated, the 3dB BW status is
shown in the table below.
3dB BW
Full
10kHz
1kHz
LPF1
LPF0
0
0
1
1
0
1
0
1
LPF off
0
1
1
Hold
BIT 3
VBAR
BIT 2
LPF1
BIT 1
LPF0
BIT 0
BIT 6
BIT 5
BIT 4
Ver. 1.2
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10/05/27
ES51932
22,000 Counts Auto DMM
4.9 CR
Carriage returns. The transmitted code is 0001101.
4.10 LF
Line feed. The transmitted code is 0001010.
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 30Ω(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
Ver. 1.2
25
10/05/27
ES51932
22,000 Counts Auto DMM
5.1 LCD Panel Configuration
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11
BP1 BATT APO
DC AUTO
5F
5E
bar8
5A
5G
5D
5B MANU 4F
5C DP4 4E
bar11 bar13 bar15
4A
4G
4D
4B
4C
bar18
BP2
BP3
BP4
bar- RS232 AC -
bar0
bar1
bar2
bar3
bar4
bar5
bar6
bar7
bar9 bar10 bar12 bar14 bar16 bar17 bar19
SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22
1A
BP1 HOLD
BP2 DP3
BP3 bar20 bar22
3F
3E
3A
3B
3C
2A
%
OC
OF
3G
3D
DP2
2F
2E
2G
2D
2B
2C
DP1
bar32
1F
1E
1G
1D
bar25 bar27
BP4 bar21 bar23 bar24 bar26 bar28 bar29 bar30 bar31 bar33 bar34 bar35
SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32
μ
2
BP1
BP2
1B
1C
m2
K
V
Ω
A
Hz
REL ADP1
MAX ADP2
n
μ
1
M
PMAX
Full
BP3 bar36 bar38 bar40 bar42 bar44 MIN ADP3
BP4 bar37 bar39 bar41 bar43 bar45 ADP0 ADP4
m1
F
PMIN 10kHz
1kHz
Ver. 1.2
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10/05/27
ES51932
22,000 Counts Auto DMM
LCD Backplane Waveform
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
5.2 LCD display on condition
LCD Annunciator
Condition
V
A
Ω
F
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.
Hz
%
In frequency mode.
In duty cycle mode.
DC
In DC voltage or DC current mode.
AC
In AC voltage or AC current mode.
AUTO
MANU
HOLD
REL
When automatic full scale range selection is enabled.
In manual mode.
When HOLD function is enabled.
When Relative function is enabled.
MAX / MIN
PMAX / PMIN
m1
When Maximum or Minimum function is enabled.
When PMAX or PMIN 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.
µ1
n
m2
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.
µ2
M
K
℃
In resistance measurement mode and the full scale range is in the order of MΩ
In resistance measurement mode and the full scale range is in the order of KΩ
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.
℉
APO
Full/10k/1kHz Low pass filter is active with 3dB = full bandwidth/10kHz/1kHz
ADP0-ADP4
RS232
When ADP mode is active, the ADP0-ADP4 segment will be active respectively.
When RS232 output is enabled.
Ver. 1.2
27
10/05/27
ES51932
22,000 Counts Auto DMM
5.3 Programmable LCD Segment Display
ES51932 supports a “Programmable LCD Segment Display”(PLSD) feature. Except
peak hold measurement, 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. ES51932 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.
ES51932 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 ES51932. When peak hold, capacitor
or duty mode is selected, the LCD display is determined by ES51932.
About the details of serial data format, please refer to page 21-25.
D5
a
D4
a
D3
a
D2
a
D1
a
ADP0
ADP1
ADP2
f
b
c
f
b
c
f
b
c
f
b
c
f
b
c
g
g
g
g
g
Lsign
e
e
e
e
DP2
B7
e
ADP3
ADP4
d
d
d
d
d
DP4
DP3
DP1
PLSD Data format:
B1
B2
B3
B4
B5
B6
B8
B9
B10
B11
B12
OL ADP0 ADP1 ADP2 ADP3 ADP4 D1a D1b D1c D1d D1e D1f
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
D1g DP1 D2a D2b D2c D2d D2e D2f D2g DP2 D3a D3b
B25
B26
B27
B28
B29
B30
B31
B32
B33
B34
B35
B36
D3c D3d D3e D3f D3g DP3 D4a D4b D4c D4d D4e D4f
B37
B38
B39
B40
B41
B42
B43
B44
B45
B46
D4g DP4 D5a D5b D5c D5d D5e D5f D5g Lsign
Note: The B1 should be sent first and the last is B46.
Set the OL bit = 1, the buzzer output will be active for 3.3beep/sec in voltage &
current mode (or peak mode). And if auto range is available, it will change to higher
range if LCD bar44 is active also.
Ver. 1.2
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10/05/27
ES51932
22,000 Counts Auto DMM
Block diagram:
RS232 DATA
SDO
. . .
SCLK
SDATA
uPLCD
μP
ES51932
PLSD DATA
FC1-FC5/SLACDC
Operation timing diagram for PLSD feature is shown as below:
46 clock pulses
tdelay
RS232 data is received
Start to send PLSD data
…
SCLK
SDO
CR
LF
PLSD data
SDATA
tHIG tLOW
tR
tF
SCLK
tHOLD
tSETU
SDATA
Parameter
Symbol Min. Typ. Max. Unit
SCLK clock frequency
SCLK clock time “L”
SCLK clock time “H”
Data input setup time
Data input hold time
fSCLK
tLOW
tHIGH
10
4.7
4.0
-
-
-
100 KHz
-
us
-
tSETUP 200
ns
tHOLD 100
SCLK/SDATA rising time
tR
tF
1.0
us
SCLK/SDATA falling time
SCLK delay time after
receiving RS232
0.3
tdelay
0.1
100
ms
Ver. 1.2
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10/05/27
ES51932
22,000 Counts Auto DMM
5.4 Operating Timing
ES51932 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 High speed
100ms
74ms
100ms
226ms
10ms
7.4ms
10ms
22.6ms
*Peak mode voltage measurement:
Phase
ZI
AZ
INT
DINT
High resolution High speed
100ms
74ms
100ms
326ms
10ms
7.4ms
10ms
32.6ms
*Capacitance measurement:
Range
Maximum measurement period
22.000nF
220.00nF
2.2000uF
22.000uF
220.00uF
2.2000mF
22.000mF
220.00mF
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.
Ver. 1.2
30
10/05/27
ES51932
22,000 Counts Auto DMM
6. Test Circuit
1. Voltage test
4. Current test
AGND
AGND
100
OR1
VR5
VR4
VR2
SGND
0.01
0.99
20A
1K
10.01k
101K
1.111M
mA
ADO
D2
1.0u
9
4.7u
1.0u
mA
uA
uA
D1
88M
ADI
100K
100K
90
A
ACVL
ACVH
TEST5
mA
uA
0.1u
IVSH
IVSL
3.9K
900
3.9K
3K
V
R
1
V
R
2K
5. Diode test
10M
-100mV
AGND
OVH
100
Voltage input
Z1
6V
Z2
PTC
1.5K
VR1
2. Resistor test
10M
OVX
22n
OHMC4
VR2
1.111M
220n
OHMC3
OHMC2
OHMC1
330n
47n
OVSG
PTC
1.5K
6. Low battery
OVH
100
Z1
6V
Z2
OVSG
9V
100
OR1
VR5
VR4
VR3
VR2
1K
680K
10.01k
BA
TT
LBAT9
101K
1.111M
0.1u
AGND
V-
270K
SGND
AGND
0V
3. Capacitor test
100k
20k
OVX
7. ADP test
220p
100
PTC
8. Frequency test
1.5K
VA+
OVH
F
R
E
Q
VA-
-100mV
Z1
6V
Z2
OVSG
ADPin+
ADPin-
ADP
100
OR1
VR5
VR4
VR3
VR2
100K
1K
200
2.2u
10K
SGND
AGND
101K
1.111M
PTC
1.5K
CA+
CA-
R9k
R1k
Fin
Ver. 1.2
31
10/05/27
ES51932
22,000 Counts Auto DMM
7. Application Circuit
7.1 AVG circuit
1
C T P K 5 1 .
+
+
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
128 LBAT9
LBAT9
127
SGND
ADP
VA+
VA-
V220m
VR1
VBAR
CA-
CA+
R9K
R1K
PMIN
PMAX
LPFC1
LPFC2
LPFOUT
LPFC3
BUZIN
SLEEP
FREQ
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
V-
VA+
VA-
126
125
124
123 SDO
V-
C-
C+
SDO
VR1
VBAR
122 FC1
FC1
121 FC2
FC2
120 FC3
FC3
119 FC4
FC4
118 FC5
FC5
C10
C11
0.1uF
0.1uF
117 SLACDC
SLACDC
116 CESEL
CESEL
115 SHIFT
SHIFT
100pF C28
2.2nF C15
114 VST
VST
C29 470pF
113 BKSEL
BKSEL
112 APOSEL
APOSEL
111 RS232
RS232
BUZIN
SLEEP
FREQ
110 uPLCD
uPLCD
109 SDA
SDATA
108 SCL
SCLK
107
106
OSC1
OSC2
105 BKOUT
BKOUT
104 BUZOUT
BUZOUT
103 VAHZ
VAHZ
+
+
+
+
Ver. 1.2
32
10/05/27
ES51932
22,000 Counts Auto DMM
7.2 True RMS circuit
1
C T K 5 P 1 .
+
+
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
128 LBAT9
LBAT9
127
SGND
ADP
VA+
VA-
V220m
VR1
VBAR
CA-
CA+
R9K
R1K
PMIN
PMAX
LPFC1
LPFC2
LPFOUT
LPFC3
BUZIN
SLEEP
FREQ
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
V-
VA+
VA-
126
125
124
V-
C-
C+
VR1
VBAR
123 SDO
SDO
122 FC1
FC1
121 FC2
FC2
120 FC3
FC3
119 FC4
FC4
118 FC5
FC5
C11
C12
0.1uF
0.1uF
117 SLACDC
SLACDC
116 CESEL
CESEL
115 SHIFT
SHIFT
100pF C28
2.2nF C16
114 VST
VST
C29 470pF
113 BKSEL
BKSEL
112 APOSEL
APOSEL
111 RS232
RS232
BUZIN
SLEEP
FREQ
110 uPLCD
uPLCD
109 SDA
SDATA
108 SCL
SCLK
107
106
OSC1
OSC2
105 BKOUT
BKOUT
104 BUZOUT
BUZOUT
103 VAHZ
VAHZ
+
+
+
+
+
C31
2.2uF
Ver. 1.2
33
10/05/27
ES51932
22,000 Counts Auto DMM
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 Zener diodes.
Ver. 1.2
34
10/05/27
ES51932
22,000 Counts Auto DMM
8. Package
1. 128L LQFP Topview
2. Dimension Parameters
Ver. 1.2
35
10/05/27
相关型号：
ES51966Q
44,000/440,000-COUNT DUAL-SLOPE ANALOG-TO-DIGITAL CONVERTER(ADC) WITH X10 AND PEAK HOLD FUNCTIONS
ETC
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