W83627DHG Datasheet, PDF(42/268 Page) Winbond – WINBOND LPC I/O

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W83627DHG Datasheet, PDF (42/268 Pages) Winbond – WINBOND LPC I/O

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W83627DHG

7.2.2 I2C interface

This interface uses the I2C Serial Bus to access the internal registers. The W83627DHG has a

programmable serial-bus address that is controlled by index 48h.

The two timing diagrams below illustrate how to use the I2C interface to write to an internal register and

how to read the value in an internal register, respectively.

(a) Serial bus write to internal address register followed by the data byte

SCL

SDA

0

780

78

0

Start By

Master

1

01

1

0

Frame 1

Serial Bus Address Byte

SCL (Continued)

SDA (Continued)

1 R/W

D7 D6 D5 D4 D3 D2 D1 D0

Ack

by

627DHG

Frame 2

Internal Index Register Byte

Ack

by

627DHG

0

78

D7 D6 D5 D4 D3 D2 D1 D0

Frame 3

Data Byte

AAckck

Stop

byby

by

672874DRHG Master

(b) Serial bus read from a register

SCL

SDA

0

780

78

0

Start By

Master

0

1

01

1

0

Frame 1

Serial Bus Address Byte

1 R/W

D7 D6 D5 D4 D3 D2 D1 D0

Ack

by

627DHG

Frame 2

Internal Index Register Byte

Ack

by

627DHG

0

780

78

0

Repeat

start

by

Master

1

01

1

0

Frame 3

Serial Bus Address Byte

1 R/W

D7 D6 D5 D4 D3 D2 D1 D0

Ack

by

627DHG

Frame 4

Data Byte

Ack

by

Master

Stop by

Master

0

Publication Release Date: Aug, 22, 2007

-30-

Version 1.4

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