Ver 1.2
5
22/02/24
ES269
6000 Counts Intelligent Auto-Function DMM IC
Pin No
Symbol
Type
Description
22
OVX
I
Input high voltage for resistance/capacitor measurement
23
CTRL
O
Connect to “- (LED Catode)” of OptoMOS-relay.
24
ACVH
I
DC signal high input in ACV/ACA mode. Connect to positive output
of external AC to DC converter.
25
ACVL
I
DC signal low input in ACV/ACA mode. Connect to negative output
of external AC to DC converter.
26
ADI
I
Negative input of internal AC to DC OP Amp.
27
ADO
O
Output of internal AC to DC OP Amp.
28
TEST5
I/O
Buffer output of OVSG
29
SGND
I
Signal Ground.
30
R9K
O
Connect to a precise 9KΩ resister for capacitor measurement.
31
R1K
O
Connect to a precise 1KΩ resister for capacitor measurement.
32
CAP
I/O
Positive auto-zero capacitor connection for capacitor measurement
33
CAN
I/O
Negative auto-zero capacitor connection for capacitor measurement
34
RGP
O
RANGE key. Input a negative pulse of less than 1 second to change the
measurement range.
35
MMXP
O
MAX. and MIN. key. Input a negative pulse of less than 1 seconds to
enter or exit MAX.&MIN function.
36
SLEEP
O
Sleep mode indicator, it asserts low in SLEEP mode.
37
LEDOUT
O
Flash driver.
38
BKOUT
O
Backlight driver.
39
ALARM
O
HV signal detection, short circuit indication and EF indication output.
40
BUZOUT
O
Outputs a 2KHz audio frequency signal for driving piezoelectric
buzzer
41
BP1
O
LCD backplane 1
42
BP2
O
LCD backplane 2
43
BP3
O
LCD backplane 3
44
BP4
O
LCD backplane 4
45-68
SEG24-SEG01
O
LCD segment line 01 – 24
69
RSOUT
O
RS232 output
70
SDAP
I/O
Input / Output from to EEPROM 24LC02 data. Open drain output.
71
SCLP
O
Output to EEPROM 24LC02 clock
72
OSC2
I
Crystal oscillator input connection
73
OSC1
O
Crystal oscillator output connection
74
DET_mA
I
Connect to GND to enter mA measurement.
75
DET_A
I
Connect to GND to enter A measurement.
76
NC
-
Not connected
77
NC
-
Not connected
78
EFKEYP
I
Input a less than 1 second negative pulse (GND to V-) to enter EF
function.
79
BKLITP
I
Input a less than 1 second negative pulse (GND to V-) to turn on Back
light.
Input an over 1 second negative pulse (GND to V-) to turn on
Flashlight.
80
SELKEYP
I
Input a less than 1 second negative pulse to switch to manual mode.
Input an over 1 second negative pulse to switch the power on/off.
81
HOLDP
I
Input a less than 1 second negative pulse (GND to V-) to enable
HOLD function.
Input an over 1 second negative pulse (GND to V-) to enable DELAY
HOLD function.
82
NC
-
Floating.
83
CLAMPAPOP
I
The option pin is used to select clamp mode or meter mode, and to
change the automatically power off time.
