MCP3304 datasheet(13/48 Pages) MICROCHIP

13 / 48 page

 2011 Microchip Technology Inc.

DS21697F-page 13

MCP3302/04

3.0

PIN DESCRIPTIONS

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

3.1

Analog Inputs (CH0-CH7)

Analog input channels. These pins have an absolute

voltage range of VSS - 0.3V to VDD+ 0.3V. The full scale

differential input range is defined as the absolute value

of (IN+) - (IN-). This difference can not exceed the

value of VREF - 1 LSB or digital code saturation will

occur.

3.2

Digital Ground (DGND)

Ground connection to internal digital circuitry. To

ensure accuracy this pin must be connected to the

same ground as AGND. If an analog ground plane is

available, it is recommended that this device be tied to

the analog ground plane in the circuit. See

Section 5.6

“Layout Considerations” for more information

regarding circuit layout.

3.3

Chip Select/Shutdown (CS/SHDN)

The CS/SHDN pin is used to initiate communication

with the device when pulled low. This pin 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 and cannot be tied low for

multiple conversions. See Figure 6-2 for serial

communication protocol.

3.4

Serial Data Input (DIN)

The SPI port serial data input pin is used to clock in

input channel configuration data. Data is latched on the

rising edge of the clock. See Figure 6-2 for serial

communication protocol.

3.5

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. See Figure 6-2 for serial communication

protocol.

3.6

Serial Clock (CLK)

The SPI clock pin is used to initiate a conversion, as

well as to clock out each bit of the conversion as it takes

place. See

Section 5.2 “Driving the Analog Input”

for constraints on clock speed, and Figure 6-2 for serial

communication protocol.

TABLE 3-1:

PIN FUNCTION TABLE

MCP3302

MCP3304

Symbol

Description

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

+4.5V to 5.5V Power Supply

5, 6

—

No Connection

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