MCP3201
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
Additional descriptions of the device pins follows.
TABLE 3-1:
PIN FUNCTION TABLE
MCP3201
Symbol
Description
MSOP, PDIP, SOIC,
TSSOP
1
2
3
4
5
6
7
8
VREF
IN+
Reference Voltage Input
Positive Analog Input
Negative Analog Input
Ground
IN-
VSS
CS/SHDN
DOUT
CLK
Chip Select/Shutdown Input
Serial Data Out
Serial Clock
VDD
+2.7V to 5.5V Power Supply
3.1
Positive Analog Input (IN+)
3.4
Serial Clock (CLK)
Positive analog input. This input can vary from IN- to
VREF + 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 Section 6.2 “Maintaining Minimum Clock
Speed” for constraints on clock speed.
3.2
Negative Analog Input (IN-)
Negative analog input. This input can vary ±100 mV
3.5
Serial Data Output (DOUT)
from VSS
.
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.
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.
© 2008 Microchip Technology Inc.
DS21290E-page 15
MICROCHIP [ MICROCHIP ]
