ES51955(5000counts)
Dual Display/Inrush
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
Opt_nF
C_clamp
S50V
SVR
APOSEL
CAL_nF
CESEL
TSEL
ALARM1
DIS_LPF
DIS_DGB
DIS_DCA
ENIR
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
I
I
I
O
I
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
Pull to V- to change the initial range to 50nF in Cap mode.
Pull to V- to change the initial range to 5uF in Cap mode.
Switch control for function selection
Switch control for function selection
Auto power off idle time selection
Pulled to V- to enable the small capacitor calibration scheme.
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.
Pulse to V- to enable the INRUSH function for clamp ACA mode
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 ]
