ES237
6000 Counts DMM
Features
＊
Back Light function
＊
KEY function
＊
Data Hold and delayed-hold function
＊
Range change function
＊
Semi-auto calibration operation
(Taiwan
patent no.: 367334)
6,000 counts LCD display with 31 analog bar-graph
LQFP 128L package
3V DC power supply
Slow ADC Conversion rate : 3 times/s
Bar-graph ADC conversion rate : 30 times/s
Full automatic measurement
＊
Voltage measurement : 600.0mV, 6.000V – 1000V
＊
Current measurement :
μA/mA/A
＊
Frequency with Voltage or Current :
＊
Resistance measurement :
60.00Ω – 60.00MΩ
＊
Capacitance measurement :
6.000nF – 60.00mF
(
Taiwan patent no.: 323347, 453443
)
＊
Capacitance measurement for Clampmeter mode :
6.000nF – 60.00mF
＊
Smart auto check for R / S / D / C mode
Resistance : 0.0Ω – 6.000MΩ
(Buz. On when R < 30Ω)
Capacitance : 0.500nF – 600.0uF
(Taiwan
patent no.: 326361)
＊
Not contact AC electric field detection
＊
Frequency counter :
600.0Hz – 60.00MHz
＊
Duty cycle measurement :
5% – 95% (< 10kHz)
Low pass filter mode for ACA/ACV measurement
(Taiwan
patent no.: 362409)
Band-gap reference voltage output
Voltage overflow selection ( DC / AC : 1010V, DC /
AC : 610V)
Serial data output ( RS232 format )
LCD segment check when power on
Auto power off ( 30min / 15min )
Sleep state indicative signal output
Re-power on
On-chip buzzer driver
Low battery detection
Description
Diode measurement & continuity check
Hazardous AC/DC voltage (HV) indication
4 ADP modes with external reference voltage and
independent “ADP” user-defined segment on LCD
Temperature mode with internal scale translation
circuit from
0
C to
0
F
K-type thermocouple reference table compensation
(-200 ~ 1350
o
C range)
ES237 is an integrated analog-to-digital converter
with 6,000-count LCD with bar-graph display,
automatic range selection, and 3V DC power
supply. Automatic range selection is provided for
ACV/DCV 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, offset
removing feature for DCA clamp mode, data
holding, maximum and minimum value holding,
duty cycle measurement, diode measurement,
temperature measurement, continuity checking,
low battery detection, auto power off, re-power on,
backlight driver, buzzer driver and RS232 data
output.
Push functions :
＊
VAHz function
＊
MAX/MIN function
＊
Relative function
＊
Zero function: DCA clampmeter only
V 2.2
1
2015/12/15
V 2.2
Application
Clamp meter
Digital multimeter
Pin Assignment
128L LQFP package
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
NC
HZ
MM
X
RE
L
BK
LIT
KE
Y
HO
LD
RA
NGE
FC5
FC4
FC3
FC2
FC1
SLA
CDC
CN
CP
LB
AT9
V-
V-
V+
V+
DG
ND
AG
ND
AG
ND
NC
NC
ES237
Cyrustek.
com.tw
2
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
RSOUT
OSC1
OSC2
RS232
VBAR
APOSEL
VST
TSEL
DIS
SEL1
SEL2
CESEL
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
102
101
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
75
74
73
72
71
70
69
68
67
66
65
IVS
ADP
TEMPin
CLAMPin
CHP
CHN
CIH
BUFH
CAZH
CLN
CLP
CIL
CAZL
BUFL
RAZ
VRH
DACO
VR_CLAMP
VR_ADP
OHMC4
OHMC3
OHMC2
OHMC1
OVSG
OR1
VR5
VR4
VR3
VR2
ACVL
ACVH
ADI
ADO
TEST5
SGND
VR1
mVin
LPFout
ES237
6000 Counts DMM
SEG
27
SEG
28
SEG
29
BP1
BP2
BP3
BP4
AL
ARM
AL 1
ARM
BK
OUT
BZ
OUT
SCL
P
SD
AP
CA
LENP
FRE
Q
SLE
EP
OV
H1
OV
H
OV
X
R1K
R10
K
CA
P
CA
N
LPC3
LPC2
LPC1
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
2015/12/15
ES237
6000 Counts 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
Symbol
IVS
ADP
TEMPin
CLAMPin
CHP
CHN
CIH
BUFH
CAZH
CLN
CLP
CIL
CAZL
BUFL
RAZ
VRH
DACO
VR_CLAMP
VR_ADP
OHMC4
OHMC3
OHMC2
OHMC1
OVSG
OR1
VR5
VR4
VR3
VR2
ACVL
Type
I
I
I
I
I/O
I/O
O
O
O
I/O
I/O
O
O
O
O
O
O
I
I
O
O
O
O
O
O
O
O
O
O
I
external AC to DC converter.
Measurement input in ADP mode.
Description
Measurement input in uA/mA current mode.
Measurement input in Temperature mode.
Current measurement input in CLAMP mode.
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.
Negative connection for reference capacitor of high-resolution A/D.
Positive connection for reference capacitor of high- resolution A/D.
High-resolution integrator output. Connect to integral capacitor. (Metalized
Polypropylene Film Capacitor type is recommended)
High-resolution auto-zero capacitor connection.
High-resolution buffer output pin. Connect to integral resistor
Buffer output pin in AZ and ZI phase.
Output of band-gap voltage reference. Typically –1.23V.
Output of band-gap voltage reference. Typically –400 m V.
Reference input voltage connection. Typically –400 mV.
Reference input voltage connection. Typically –400mV.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Sense low voltage for resistance/voltage measurement
Reference resistor connection for 60.00/600.0Ω range
Voltage measurement ÷10000 attenuator(1000V)
Voltage measurement ÷1000 attenuator(600.0V)
Voltage measurement ÷100 attenuator(60.00V)
Voltage measurement ÷10 attenuator(6.000V)
Rectified signal low input in ACV/ACA mode. Connect to negative output of
Rectified signal high input in ACV/ACA mode. Connect to positive output of
31
32
33
34
35
36
V 2.2
ACVH
ADI
ADO
TEST5
SGND
VR1
I
external AC to DC converter.
I
O
O
I
I
Negative input of internal AC to DC OP Amp.
Output of internal AC to DC OP Amp.
Buffer output of OVSG.
Signal Ground input.
Measurement Input. Connect to a precised
10MΩ resistor.
3
2015/12/15
ES237
6000 Counts DMM
Pin Description ( Continued )
Pin No
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62 - 90
91
92
93
94
95
Symbol
mVin
LPFout
LPC1
LPC2
LPC3
CAN
CAP
R10K
R1K
OVX
OVH
OVH1
SLEEP
FREQ
CALENP
SDAP
SCLP
BZOUT
BKOUT
ALARM1
ALARM
BP4
BP3
BP2
BP1
SEG29 - SEG01
CESEL*
SEL2*
SEL1*
DIS*
TSEL*
Type
I
O
O
O
O
I/O
I/O
O
O
I
O
O
O
I
I
I/O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
Description
Measurement input in 600.0mV mode.
Capacitor C1 connection for internal low-pass filter.
Capacitor C1 connection for internal low-pass filter.
Capacitor C2 connection for internal low-pass filter.
Capacitor C3 connection for internal low-pass filter.
Negative auto-zero capacitor connection for capacitor measurement.
Positive auto-zero capacitor connection for capacitor measurement.
Connect to a precised 10KΩ
resister for capacitor measurement.
Connect to a precised
1KΩ resister for capacitor measurement.
Sense input for resistance / capacitance measurement.
Output connection for resistance measurement.
Output connection for resistance measurement. (Optional)
Sleep mode indicator, asserts low in SLEEP mode.
Frequency counter input, offset V-/2 internally by the chip.
Pulled to V- to enable the calibration scheme.
Input / Output from to EEPROM 24LC02 data.
Output to EEPROM 24LC02 clock.
Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
If BKLIT function is enabled, this pin will change from V- to V+. Once press
BKLIT pin again within 300 sec, this pin will change back to V-.
Short circuit indication output.
HV signal detection in Voltage mode and EF mode indication output.
LCD backplane 4.
LCD backplane 3.
LCD backplane 2.
LCD backplane 1.
LCD segment line 01 – 29.
Voltage OL selection feature control pin. (1010V/610V)
Diode OL level and HV indication selection pin.
Set current mode OL level selection pin. (DMM or Clamp mode)
Control warning buzzer output at LPF and HV mode
Temperature mode controls the automatic mode or manual mode and enable or
disable input terminal symbol displayed on the LCD panel selection pin.
Enable the auto range voltage mode to start from 600.0V or disable ADP input
96
97
98
V 2.2
VST*
APOSEL
VBAR
I
terminal symbol displayed on the LCD panel selection pin.
I
I
Set to V- to enable clamp current mode.
4
2015/12/15
Idle time selection for auto power off feature.
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign.
ES237
6000 Counts DMM
Pin Description ( Continued )
Pin No
99
100
101
102
103
104
105
Symbol
RS232
OSC2
OSC1
RSOUT
NC
HZ
MMX
Type
I
O
I
O
-
I
I
Description
Assert low (V-) to make serial data output function not available.
Crystal oscillator output connection.
Crystal oscillator input connection.
Serial data output.
Not connected
Pulse to V- to enable VAHZ mode or duty cycle measurement in Freq. mode.
Pulse to V- to enable MAX/MIN function.
Pulse to V- to enable/disable Relative function or Zero function. Pulse to V-
106
REL
I
larger than one second to enable RS232 output. When RS232 output is enabled,
the APO will be disabled automatically.
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
BKLIT
KEY
HOLD
RANGE
FC5
FC4
FC3
FC2
FC1
SLACDC
CN
CP
LBAT9
V-
V-
V+
V+
DGND
AGND
AGND
NC
NC
I
I
I
Back light function. Pulse low to set BKOUT pin output.
Pulse to V- to change mode.
Pulse to V- to enable HOLD function. Pulse to V- larger than one second to
enable Delayed Hold function.
I
I
I
I
I
I
I
O
O
I
P
P
O
O
P/G
P/G
P/G
-
-
Pulse to V- to enable manual mode and manual range selection.
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.
Select initial DC/AC state.
Negative capacitor connection for on-chip DC-DC converter.
Positive capacitor connection for on-chip DC-DC converter.
Multi-level low battery configuration input. Simple external resistor divider is
required.
Negative supply voltage.
Negative supply voltage.
Output of on-chip DC-DC converter.
Output of on-chip DC-DC converter.
Digital ground.
Analog ground.
Analog ground.
Not connected
Not connected
Note: Pin91-Pin96 are 4-level logic definition: (V+/DGND/Floating/V-), see
section Operation mode
V 2.2
5
2015/12/15
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