W83783S_07 WINBOND [Winbond], W83783S_07 Datasheet - Page 10

• Manufacturer Part Number: W83783S_07
• Description: Winbond H/W Monitoring IC
• Manufacturer: WINBOND [Winbond]

6. FUNCTIONAL DESCRIPTION
6.1 General Description
W83783S provides at most 6 analog positive inputs, 3 fan speed monitors, 2 sets for fan PWM (Pulse
Width Modulation) control, 2 thermal inputs from remote thermistors or 2N3904 transistors or
Pentium
exceed the set limit value including voltage, temperature, or fan counter. When starting the monitor
function on the chip, the watch dog machine monitor every function and store the value to registers. If
the monitor value exceeds the limit value, the interrupt status will be set to 1.
6.2 Access Interface
W83783S provides I
addresses. The first address defined at CR [48h] can read/write all registers excluding Bank 1
temperature sensor registers and the address default value is 0101101. The second address defined
at CR [4Ah] bit2-0 only read/write temperature sensor 1 registers and the address default value is
1001001.
6.2.1 The first serial bus access timing is shown as follow:
(a) Serial bus write to internal address register followed by the data byte
SCL
SDA
TM
II (Deschutes) thermal diode outputs and beep function output when the monitor value
Start By
Master
0
0
2
C Serial Bus to read/write internal registers. In W83783S there are two serial bus
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
1
Serial Bus Address Byte
0
SCL
SDA (Continued)
Frame 1
1
(Continued)
1
0
1
R/W
0
D7
7
- 6 -
Ack
781D
by
8
D6
0
D7
D5
D6
D4
Internal Index Register Byte
Publication Release Date: August 21, 2007
D5
D3
Data Byte
Frame 3
Frame 2
D4
D2
D3
D1
D2
7
D0
Ack
781D
by
D1
8
7
D0
Master
Stop
by
W83783S
Ack
781D
by
8
Revision 1.0