ES51945(5000counts)
Dual Display/No Cap
53
54
55
56
57
58
59
60
61
62
63-86
87-90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115-118
119
120
121
122
123
124
125
126
127
128
LPFC1
LPFC2
LPFC3
LPFOUT
SLEEP
BUZIN
FREQ
CAL_EN
SDA
SCL
SEG24-SEG01
BP4-BP1
ALARM
BUZOUT
BKOUT
OSC1
OSC2
LCDCAP
NC
NC
S50V
SVR
APOSEL
NC
CESEL
TSEL
ALARM1
DIS_LPF
DIS_DGB
DIS_DCA
NC
BKLIT
SEL
HOLD
RANGE
SAC
FC4-FC1
C-
C+
LBAT9
V-
V-
V+
V+
DGND
AGND
AGND
O
O
O
O
O
I
I
I
I/O
O
O
O
O
O
O
I
O
I
-
-
I
I
I
-
I
I
O
I
I
I
-
I
I
I
I
I
I
O
O
I
P
P
O
O
P/G
P/G
P/G
Capacitor C1 connection for internal low-pass filter
Capacitor C2 connection for internal low-pass filter
Capacitor C3 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Sleep mode indicator, asserts low in SLEEP mode.
Pull to V- to enable the BUZOUT.
Frequency counter input, offset V-/2 internally by the chip.
Pulled to V- to enable the semi-auto calibration scheme.
Input/Output from/to EEPROM 24C02 data
Output to EEPROM 24C02 clock
LCD segment output driver 01-24 (SEG signals)
LCD backplane 1-4 (COM signals)
LED control output driver for HV indication and NCV detection
Outputs a 2KHz audio frequency signal for driving piezoelectric
buzzer when BUZIN is low or functional key is active.
If BKLIT function is enabled, this pin will change from V- to V+
For 60 sec, once press BKLIT pin again within 60 sec, this pin will
Change back to V-.
Crystal oscillator input connection
Crystal oscillator output connection
LCD bias voltage bypass capacitor connection
Not connected
Not connected
Switch control for function selection
Switch control for function selection
Auto power off idle time selection
Not connected
OL selection feature control pin in Voltage mode.
Pulled to V- to cancel the 500
o
C auto range mode
LED control output driver for short-circuit detected in Cont. mode.
Pulled to V- to disable the low-pass-filter path in ACA mode
Pulled to V- to disable the buzzer beeper when HV danger appears.
Pulled to V- to disable DCA function in DCV mode.
Not connected
Back light function. Pulse to V- to set BKOUT pin output.
Pulse to V- to enable function selection
Pulse to V- to enable HOLD function.
Pulse to V- to enable manual mode and manual range selection.
Switch for AC/DC function selection.
Switches for function selection.
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 and positive supply voltage.
Output of on-chip DC-DC converter and positive supply voltage.
Digital ground.
Analog ground.
Analog ground.
v2.3
4
10/06/25
CYRUSTEK [ Cyrustek corporation ]
