W83627HF Datasheet, PDF (107/185 Pages) Winbond – WINBOND I/O

W83627HF/F
PRELIMINARY
11.2.2 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
temperature sensor 2 registers, and the third address defined at CR[4Ah] bit6-4 only can access
(read/write) temperature sensor 3 registers.
11.2.2.1
The first serial bus access timing is shown as follow:
(a) Serial bus write to internal address register followed by the data byte
0
SCL
780
78
SDA
0
1
0
1
1
0
1 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start By
Master
Frame 1
Serial Bus Address Byte
Ack
Ack
by
Frame 2
by
781D
781D
Internal Index Register Byte
0
SCL (Continued)
78
SDA (Continued)
D7 D6 D5 D4 D3 D2 D1 D0
Frame 3
Data Byte
Ack
by
781D
Stop
by
Master
(b) Serial bus write to internal address register only
0
SCL
780
78
SDA
0 1 0 1 1 0 1 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start By
Master
Frame 1
Serial Bus Address Byte
Ack Stop by
Ack
by
Frame 2
by Master
781D
781D
Internal Index Register Byte
0
(c) Serial bus read from a register with the internal address register prefer to desired location
0
SCL
780
78
SDA
0 1 0 1 1 0 1 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start By
Master
Frame 1
Ack
by
Serial Bus Address Byte
781D
Frame 2
Data Byte
Ack
by ^{Stop by}
Master Master
0
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Publication Release Date: Jul 1999
Revision 0.53