ES51993
11,000 Counts ADC
Pin Description
Pin No
Symbol
CAZ
Type
Description
1
2
3
4
5
6
7
8
I
Auto-zero capacitor connection.
CINT
CREF+
CREF-
REF+
REF-
O
Integrator output. Connect to integral capacitor
I/O Positive connection for reference capacitor.
I/O Negative connection for reference capacitor.
I
I
O
O
Differential reference high voltage input.
Differential reference low voltage input.
Buffer output pin. Connect to integral resistor
Buffer output pin in high-speed mode. Connect to high-speed integral
resistor.
Pick hold signal input which is reference to AGND
Minimum peak hold output capacitor connection.
Maximum peak hold output capacitor connection.
Analog differential high signal input.
Analog signal high input1
Analog signal high input2
Analog differential low signal input.
BUF
RAZ
9
PHin
PMAX
PMIN
VIN+
VIN1+
VIN2+
VIN-
SDATA
SCLK
EOC
BUZOUT
uP_VCC
OSC2
OSC1
C-
I
O
O
I
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
I
I
I
I/O Serial data I/O pin. Nch open-drain output.
I
O
O
I
Serial clock input pin.
An indicator for ADC conversion ending.
Buzzer frequency output
MPU I/O port power level selection
O
I
Crystal oscillation connection
Crystal oscillation connection
O
O
I
Negative capacitor connection for on-chip DC-DC converter.
Positive capacitor connection for on-chip DC-DC converter.
Chip select input pin. Pull to Low to enter power down mode.
MPU I/O port ground level selection
C+
CS
I/O_control
LBAT
I
I
Low battery configuration. If 3V battery is used, connect it to AGND.
The default low-battery threshold voltage is –2.3V. If 9V or other
battery voltage is used, the low battery annunciator is displayed when
the voltage of this pin is less than V12
28
29
30
31
32
DGND
V+
G
Digital ground
O/P Output of on-chip DC-DC converter.
V-
P
G
O
Negative supply voltage. Connecting to 3V battery negative terminal.
Analog ground
Output of band-gap voltage reference. Typically –1.23V
AGND
V12
3
06/09/20
CYRUSTEK [ Cyrustek corporation ]
