W83782D Datasheet, PDF (15/73 Pages) Winbond – MONITORING IC

Preliminary W83782D
6.2.2 I²C interface
The second interface uses I²C Serial Bus. In the W83782D 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.
The first serial bus address of W83782D has 3 hardware setting bits set by pin47-45 when pin 43 is
set to high. The address is 00101[pin45][pin46][pin47]. If pin45=1, pin46=1, pin47=0, for example, the
content of CR[48h] is 00101110. If CR[4Ah] bit 2-0 is XXX , the temperature sensor 2 serial address is
1001XXXG, in which G is the read/write bit. If CR[4Ah] bit 6-4 is YYY , the temperature sensor 3
serial address is 1001YYYG, in which G is the read/write bit.
6.2.3 The first serial bus access timing are shown as follow:
(a) Serial bus write to internal address register followed by the data byte
0
SCL
780
78
SDA
0
Start By
Master
10110
Frame 1
Serial Bus Address Byte
SCL (Continued)
1 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Ack
Ack
by
Frame 2
by
781D
781D
Internal Index Register Byte
0
78
SDA (Continued)
D7 D6 D5 D4 D3 D2 D1 D0
Frame 3
Data Byte
Ack
by
781D
Stop
by
Master
Figure 2. Serial Bus Write to Internal Address Register followed by the Data Byte
Publication Release Date: April 1999
-9-
Revision A1