MCP3204 datasheet(15/40 Pages) MICROCHIP

15 / 40 page

DS21298E-page 15

MCP3204/3208

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

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 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. See

Section 4.1 “Analog Inputs”

, “Analog Inputs”, and

Section 5.0 “Serial communications”

, “Serial Com-

munications”, 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.

See Section 6.2 “Maintaining Minimum Clock

Speed”

, “Maintaining Minimum Clock Speed”, for con-

straints on clock speed.

3.5

Serial Data Input (D

IN)

The SPI port serial data input pin is used to load

channel configuration data into the device.

3.6

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.

3.7

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.

TABLE 3-1:

PIN FUNCTION TABLE

MCP3204

MCP3208

Symbol

Definition

PDIP, SOIC,

TSSOP

PDIP, SOIC

CH0

Analog Input

CH1

Analog Input

CH2

Analog Input

CH3

Analog Input

—

CH4

Analog Input

—

CH5

Analog Input

—

CH6

Analog Input

—

CH7

Analog Input

DGND

Digital Ground

810

CS/SHDN

Chip Select/Shutdown Input

911

DIN

Serial Data In

DOUT

Serial Data Out

CLK

Serial Clock

AGND

Analog Ground

VREF

Reference Voltage Input

VDD

+2.7V to 5.5V Power Supply

5, 6

—

No Connection

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