MCP3201
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in
Additional descriptions of the device pins follows.
TABLE 3-1:
PIN FUNCTION TABLE
Symbol
V
REF
IN+
IN-
V
SS
CS/SHDN
D
OUT
CLK
V
DD
Description
Reference Voltage Input
Positive Analog Input
Negative Analog Input
Ground
Chip Select/Shutdown Input
Serial Data Out
Serial Clock
+2.7V to 5.5V Power Supply
MCP3201
MSOP, PDIP, SOIC,
TSSOP
1
2
3
4
5
6
7
8
3.1
Positive Analog Input (IN+)
3.4
Serial Clock (CLK)
Positive analog input. This input can vary from IN- to
V
REF
+ IN-.
3.2
Negative Analog Input (IN-)
The SPI clock pin is used to initiate a conversion and to
clock out each bit of the conversion as it takes place.
See
for constraints on clock speed.
Negative analog input. This input can vary ±100 mV
from V
SS
.
3.5
Serial Data Output (D
OUT
)
3.3
Chip Select/Shutdown (CS/SHDN)
The CS/SHDN pin is used to initiate communication
with the device when pulled low and will end a
conversion and put the device in low power standby
when pulled high. The CS/SHDN pin must be pulled
high between conversions.
The SPI serial data output pin is used to shift out the
results of the A/D conversion. Data will always change
on the falling edge of each clock as the conversion
takes place.
©
2008 Microchip Technology Inc.
DS21290E-page 15
MICROCHIP [ MICROCHIP TECHNOLOGY ]
