W83627HF/ F/ HG/ G
7.2.2 I2C interface
The second interface uses I2C Serial Bus. W83627HF hardware monitor has three serial bus address.
That is, the first address defined at CR[48h] can read/write all registers excluding Bank 1 and Bank 2
temperature sensor 2/3 registers. The second address defined at CR[4Ah] bit2-0 only read/write tem-
perature sensor 2 registers, and the third address defined at CR[4Ah] bit6-4 only can access
（read/write）temperature sensor 3 registers.
7.2.2.1 The first serial bus access timing is shown as follow：
(a) Serial bus write to internal address register followed by the data byte
0
7
8
0
7
8
SCL
SDA
0
1
0
1
1
0
1
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Start By
Master
Ack
by
781D
Ack
by
781D
Frame 1
Serial Bus Address Byte
Frame 2
Internal Index Register Byte
7
0
8
SCL (Continued)
SDA (Continued)
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
781D
Stop
by
Master
Frame 3
Data Byte
(b) Serial bus write to internal address register only
0
7
8
0
7
8
SCL
SDA
0
1
0
1
1
0
1
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Start By
Master
Ack
by
781D
Stop by
Master
Ack
by
781D
Frame 1
Serial Bus Address Byte
Frame 2
Internal Index Register Byte
0
(c) Serial bus read from a register with the internal address register prefer to desired location
0
7
8
0
7
8
SCL
SDA
0
1
0
1
1
0
1
R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start By
Master
Ack
by
Master
Ack
by
781D
Stop by
Master
Frame 1
Serial Bus Address Byte
Frame 2
Data Byte
0
Publication Release Date: June 09, 2006
Revision 2.27
- 29 -
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