
2008 Microchip Technology Inc.
DS21295D-page 15
MCP3004/3008
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
3.1
Digital Ground (DGND)
Digital ground connection to internal digital circuitry.
3.2
Analog Ground (AGND)
Analog ground connection to internal analog circuitry.
3.3
Analog inputs (CH0 - CH7)
Analog inputs for channels 0 - 7, respectively, for the
multiplexed inputs. Each pair of channels can be
programmed to be used as two independent channels
in single-ended mode or as a single pseudo-differential
input where one channel is IN+ and one channel is IN.
Communication”, for information on programming the
channel configuration.
3.4
Serial Clock (CLK)
The SPI clock pin is used to initiate a conversion and
clock out each bit of the conversion as it takes place.
, “Maintaining Minimum Clock Speed”, for
constraints on clock speed.
3.5
Serial Data Input (DIN)
The SPI port serial data input pin is used to load
channel configuration data into the device.
3.6
Serial Data Output (DOUT)
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.
3.7
Chip Select/Shutdown (CS/SHDN)
The CS/SHDN pin is used to initiate communication
with the device when pulled low. When pulled high, it
will end a conversion and put the device in low-power
standby. The CS/SHDN pin must be pulled high
between conversions.
MCP3004
MCP3008
Symbol
Description
PDIP, SOIC,
TSSOP
PDIP, SOIC
1
CH0
Analog Input
2
CH1
Analog Input
3
CH2
Analog Input
4
CH3
Analog Input
–
5
CH4
Analog Input
–
6
CH5
Analog Input
–
7
CH6
Analog Input
–
8
CH7
Analog Input
7
9
DGND
Digital Ground
810
CS/SHDN
Chip Select/Shutdown Input
911
DIN
Serial Data In
10
12
DOUT
Serial Data Out
11
13
CLK
Serial Clock
12
14
AGND
Analog Ground
13
15
VREF
Reference Voltage Input
14
16
VDD
+2.7V to 5.5V Power Supply
5,6
–
NC
No Connection