Datasheet

 1998-2011 Microchip Technology Inc. DS21290F-page 15
MCP3201
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Tabl e 3-1.
Additional descriptions of the device pins follows.
TABLE 3-1: PIN FUNCTION TABLE
3.1 Positive Analog Input (IN+)
Positive analog input. This input can vary from IN- to
V
REF
+ IN-.
3.2 Negative Analog Input (IN-)
Negative analog input. This input can vary ±100 mV
from V
SS
.
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.
3.4 Serial Clock (CLK)
The SPI clock pin is used to initiate a conversion and to
clock out each bit of the conversion as it takes place.
See Section 6.2 “Maintaining Minimum Clock
Speed” for constraints on clock speed.
3.5 Serial Data Output (D
OUT
)
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.
MCP3201
Symbol Description
MSOP, PDIP, SOIC,
TSSOP
1V
REF
Reference Voltage Input
2 IN+ Positive Analog Input
3 IN- Negative Analog Input
4V
SS
Ground
5CS
/SHDN Chip Select/Shutdown Input
6D
OUT
Serial Data Out
7 CLK Serial Clock
8V
DD
+2.7V to 5.5V Power Supply