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TC1321
(Rev.:2002)

10-Bit Digital-to-Analog Converter with Two-Wire Interface

Microchip Technology 

TC1321

FIGURE 3-1:

SMBus PROTOCOLS

Write 1-Byte Format

S

Address

7-Bits

Slave Address

Write 2-Byte Format

R/W ACK Command

ACK Data ACK P

0

8-Bits

8-Bits

Command Byte: selects

which register you are

writing to.

Data Byte: data goes

into the register set

by the command byte.

S

Address

R/W ACK Command

ACK Data ACK Data ACK P

7-Bits

0

8-Bits

8-Bits

8-Bits

Slave Address

Command Byte: selects

which register you are

writing to.

Data Byte: data goes

into the register set

by the command byte.

Read 1-Byte Format

S Address R/W ACK Command ACK S Address R/W ACK Data NACK P

7-Bits 0

8-Bits

7-Bits 1

8-Bits

Slave Address

Command Byte: selects Slave Address: repeated Data Byte: reads from

which register you are due to change in data the register set by the

reading from.

flow direction.

command byte.

Read 2-Byte Format

S Address R/W ACK Command ACK S Address R/W ACK Data ACK Data NACK P

7-Bits 0

8-Bits

7-Bits 1

8-Bits

8-Bits

Slave Address

Command Byte: selects Slave Address: repeated Data Byte: reads from

which register you are due to change in data the register set by the

reading from.

flow direction.

command byte.

Receive 1-Byte Format

S Address R/W ACK Data NACK P

7-Bits 1

8-Bits

S = START Condition

Data Byte: reads data from

P = STOP Condition

the register commanded by

Shaded = Slave Transmission the last read byte or write

byte transmission.

Receive 1-Byte Format

S Address R/W ACK Data ACK Data NACK P

7-Bits 1

8-Bits

8-Bits

S = START Condition

Data Byte: reads data from

P = STOP Condition

the register commanded by

Shaded = Slave Transmission the last read byte or write

byte transmission.

© 2002 Microchip Technology Inc.

DS21387B-page 7

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