ES51921
22,000 Counts Auto DMM
47
CA+
48
R9K
49
R1K
50
NC
51
NC
52
LPFC1
53
LPFC2
54
LPFOUT
55
LPFON
56
LPFC3
57
BUZIN
58
SLEEP
59
FREQ
60
NC
61 - 90 SEG31 – SEG01
91
BP4
92
BP3
93
BP2
94
BP1
95
ANNUNC
IO
O
O
O
O
O
I
I
I
O
I
O
O
O
O
O
O
Positive auto-zero capacitor connection for capacitor measurement
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Capacitor C1 connection for internal low-pass filter
Capacitor C2 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Pull to V- to enable low-pass filter
Capacitor C3 connection for internal low-pass filter
Pull to V- to enable the BUZOUT.
Sleep mode indicator, asserts low in SLEEP mode.
Frequency counter input, offset V-/2 internally by the chip.
LCD segment line 01 – 31
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.
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.
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.
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.
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
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.
Assert low to enable LCD SHIFT future, only works in 220MΩ, and
all capacitor measurement ranges
CE selection feature control pin.
Select initial state.
Switch 5 for function selection.
Switch 4 for function selection.
Switch 3 for function selection.
4
10/06/23
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Ver. 3.2
HOLD
RANGE
REL_ZERO
KEY
MAX/MIN
NC
BKLIT
VAHZ
BUZOUT
BKOUT
OSC2
OSC1
SCLK
SDATA
μPLCD
RS232
APOSEL
BKSEL
VST
SHIFT
CESEL
SLACDC
FC5
FC4
FC3
I
I
I
I
I
I
I
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
CYRUSTEK [ Cyrustek corporation ]
