W83L771ASG Datasheet, PDF(9/28 Page) Nuvotem Talema – W83L771AWG W83L771ASG Nuvoton H/W Monitoring IC

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W83L771ASG Datasheet, PDF (9/28 Pages) Nuvotem Talema – W83L771AWG W83L771ASG Nuvoton H/W Monitoring IC

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W83L771AWG/W83L771ASG

7.2 Access Interface

The W83L771AWG/ASG provides SMBus serial interface to read/write internal registers, and the

SMBus address for read and write is 10011001b and 10011000b, respectively.

The W83L771AWG-2 and W83L771ASG-2 respond to hard-wire SMBus slave address as shown in

Table 1.1.

The first serial bus access timing is shown as follows:

7.2.1 Serial bus write to internal address register followed by the data byte

SCL

780

SDA

Start By

Mas ter

Frame 1

Serial Bus Address Byte

S CL (Continued)

10 R/W

D7 D6 D5 D4 D3 D2 D1 D0

AckAbcyk

771AWb yG

785R

Frame 2

Internal Index Register Byte

AckAbcyk

771AbWyG

785R

SDA (Continued)

D7 D6 D5 D4 D3 D2 D1 D0

Frame 3

Data Byte

AAbcbkycykby

777178A84W5RRG

Sto p

Master

Figure 1. Serial Bus Write to Internal Address Register followed by the Data By te

7.2.2 Serial bus read form internal address register followed by the data byte

SCL

780

SDA

10 01 0 1 1 00 01 R/W

D7 D6 D5 D4 D3 D2 D1 D0

Start By

Master

Frame 1

Serial Bus Address Byte

Ack by

771AWG

Frame 2

Internal Index Register Byte

Ack

771AWG

SCL(Continued)

012345678012345678

SDA(Continued)

01 0

1 1 00 01 R/W

D7 D6 D5 D4 D3 D2 D1 D0

Frame 3

Serial Bus Byte

aAcckk

bbyy

7717A8W5GR

Frame 4

Data Byte

nAo ck Stop by

784R

Ack

Master

Publication Release Date: 2009/11/19

Version: 1.91

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