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W83L786R/ W83L786G
7.   FUNCTIONAL DESCRIPTION
7.1   General Description
W83L786R/G provides 5 analog voltage inputs, 2 fan speed input monitoring and output controls
which support both PWM (Pulse Width Modulation) fan control and DC (Direct Current) fan control, all
of them being implemented with SMART FAN
TM
I and SMART FAN
TM
 II, and 3 sets of thermal inputs for
remote thermistors and GPU thermal diode sensor. W83L786R/G is I
2
C / SMBus interface compatible.
1 set of 5-bit VID input/output for processor VID table could be selected by hardware trapping for
VRM9.0 specifications. Furthermore, the Watch Dog Timer will monitor every function and store the
values to registers for comparison with preset ranges. If the monitored value exceeds the limit value,
the interrupt status will be set to 1 and W83L786R/G will issue interrupt signals such as INT# and IRQ
if not masked. W83L786R/G also provides software and hardware Watch Dog Timer to avoid system
hang on.
7.2   Access Interface
W83L786R/G provides I
2
C Serial Bus for microprocessor to read/write internal registers, and the I
2
C
address default value is 01011110b (Pin 9 pull high). If Pin 9 pulls low, the I
2
C address value is
01011100b.
7.3   The First Serial Bus Access Timing
 (a) Serial bus writes to internal address register followed by the data byte
0
Start By
Master
0
1
0
1
1
0
1
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
792D
R/W
Ack
by
792D
SCL
SDA
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
784R
Stop
by
Master
SCL
SDA (Continued)
7
8
0
7
8
0
7
8
Frame 2
Internal Index Register Byte
(Continued)
Frame 3
Data Byte
Frame 1
Serial Bus Address Byte
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
Ack
by
792D
 
 
Publication Release Date: March 06
  - 9 -
Revision0.8
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