ES51921
22,000 Counts Auto DMM
121
122
123
124
125
126
127
128
FC2
FC1
SDO
C+
C-
V-
V-
LBAT9
I
I
O
O
O
P
P
I
Switch 2 for function selection.
Switch 1 for function selection.
RS232 compliant serial data output.
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
Negative supply voltage. Connecting to 3V battery negative terminal.
Negative supply voltage. Connecting to 3V battery negative terminal.
Low battery configuration. If 3V battery is used, connect it to AGND.
The default low-battery threshold voltage is –2.3V. If 9V battery is
Used, the low battery annunciator is displayed when the voltage of
this pin is less than VRH (-1.2V)
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage
V+
AGND/DGND
Digital Input
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
Rating
-4V
V- -0.6 to V+ +0.6
V+
≥
(AGND/DGND+0.5V)
AGND/DGND
≥
(V- -0.5V)
V- -0.6 to DGND +0.6
500mW
0℃ to 70℃
-25℃ to 125℃
Electrical Characteristics
TA=25℃, V- = -3V
Parameter
Power supply
Operating supply current
In DCV mode
Voltage roll-over error
Voltage nonlinearity
Input Leakage
Low battery flag voltage
Zero input reading
Band-gap reference voltage
V
REF
Peak to peak backplane
drive voltage
Counter time base period
Symbol
Test Condition
V-
I
DD
Normal operation
In sleep mode
I
SS
REV 10MΩ input resistor
Best case straight
NLV
line
V- to AGND
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
-3.5V
≤
V
≤
-2.2V
f
OSC
= 4MHZ
Between V- pin and
HOLD, RANGE,
KEY, FC1, FC2,
FC3, FC4, FC5,
BKLIT,MAXMIN
Between V- pin
and RS232
Open circuit voltage for 220Ω
measurement
220Ω mode
Min.
-3.5
—
—
—
—
-10
-2.5
-000
-1.3
3.0
—
Typ.
-3.0
2.0
2.5
—
—
1
-2.3
000
-1.2
3.1
1
Max
-2.5
2.5
5
±0.03
±0.03
10
-2.1
+000
-1.1
3.2
—
Units
V
mA
µA
%F.S
1
%F.S
PA
V
counts
V
V
sec
Internal pull-high to 0V
current
—
1.2
—
µA
—
—
11
-3.0
—
—
V
Ver. 3.2
5
10/06/23
CYRUSTEK [ Cyrustek corporation ]
