w83l784r Winbond Electronics Corp America, w83l784r Datasheet - Page 11

• Manufacturer Part Number: w83l784r
• Description: Winbond H/w Monitoring Ic
• Manufacturer: Winbond Electronics Corp America

6. FUNCTIONAL DESCRIPTION
6.1 General Description
fan PWM (Pulse Width Modulation) Smart Fan Control , 2 remote thermal inputs from remote
thermistors or 2N3904 transistors or Pentium
thermal detection. W83L784R also provides the power good (reset) output for 3V and 5V power
detection and two fault output pins issuing hardware warning if battery and fans become abnormal.
When start 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
there are three serial bus address. The first address defined at CR[4Ah] can read/write all registers
excluding CPUT1/CPUT2 temperature sensor registers and its address default value is 0101101. The
address for CPUT1 defined at CR[4Bh] bit2-0 only read/write CPUT1 temperature sensor registers
and the address default value is 1001001. The address for CPUT2 defined at CR[4Bh] bit2-0 only
read/write CPUT1 temperature sensor registers and the address default value is 1001000.
6.2.1 The first serial bus access timing are shown as follow:
(a) Serial bus write to internal address register followed by the data byte
Confidential, For Beta-site Only
SCL
SDA
The W83L784R provides at most 4 analog positive inputs, 2 fan speed monitors, 2 sets for
The W83L784R provides I
Start By
Master
0
0
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
2
C Serial Bus to read/write internal reigsters. In the W83L784R
0
1
TM
-10 -
R/W
0
D7
7
II (Deschutes) thermal diode outputs and one on-chip
Ack
784R
by
8
D6
0
D7
D5
D6
D4
Internal Index Register Byte
D3
D5
Data Byte
Frame 3
Frame 2
D4
D2
D3
D1
Publication Release Date: Sep.
D2
7
D0
784R
Ack
by
D1
8
W83L784R
7
D0
Master
Stop
by
Preliminary
784R
Ack
by
8
Revision 0.54
1999