MCP3021 datasheet(12/26 Pages) MICROCHIP

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MCP3021

DS21805A-page 12

 2003 Microchip Technology Inc.

3.0

PIN FUNCTIONS

TABLE 3-1:

PIN FUNCTION TABLE

3.1

VDD and VSS

The VDD pin, with respect to VSS, provides power to the

device, as well as a voltage reference for the conver-

sion process. Refer to Section 6.4, “Device Power and

Layout Considerations”, for tips on power and

grounding.

3.2

Analog Input (AIN)

AIN is the input pin to the sample and hold circuitry of

the Successive Approximation Register (SAR) con-

verter. Care should be taken in driving this pin. Refer to

Section 6.1, “Driving the Analog Input”. For proper con-

versions, the voltage on this pin can vary from VSS to

VDD.

3.3

Serial Data (SDA)

This is a bidirectional pin used to transfer addresses

and data into and out of the device. It is an open-drain

terminal, therefore, the SDA bus requires a pull-up

resistor to VDD (typically 10 kΩ for 100 kHz and 2 kΩ

for 400 kHz SCL clock speeds (refer to Section 6.2,

“Connecting to the I2C Bus”).

For normal data transfer, SDA is allowed to change only

during SCL low. Changes during SCL high are reserved

for indicating the START and STOP conditions (refer to

Section 5.1, “I2C Bus Characteristics”).

3.4

Serial Clock (SCL)

SCL is an input pin used to synchronize the data trans-

fer to and from the device on the SDA pin and is an

open-drain terminal. Therefore, the SCL bus requires a

pull-up resistor to VDD (typically, 10 kΩ for 100 kHz and

Ω for 400 kHz SCL clock speeds. Refer to

Section 6.2, “Connecting to the I2C Bus”).

For normal data transfer, SDA is allowed to change

only during SCL low. Changes during SCL high are

reserved for indicating the START and STOP

conditions (refer to Section 6.1, “Driving the Analog

Input”).

Name

Function

VDD

+2.7V to 5.5V Power Supply

VSS

Ground

AIN

Analog Input

SDA

Serial Data In/Out

SCL

Serial Clock In

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