W83L784 데이터 시트보기 (PDF) - Winbond
부품명
상세내역
제조사
W83L784 Datasheet PDF : 56 Pages
| |||
W83L784R
Preliminary
6. FUNCTIONAL DESCRIPTION
6.1 General Description
The W83L784R provides at most 4 analog positive inputs, 2 fan speed monitors, 2 sets for
fan PWM (Pulse Width Modulation) Smart Fan Control , 2 remote thermal inputs from remote
thermistors or 2N3904 transistors or PentiumTM II (Deschutes) thermal diode outputs and one on-chip
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
The W83L784R provides I2C Serial Bus to read/write internal reigsters. In the W83L784R
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
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
784R
784R
Internal Index Register Byte
0
78
SDA (Continued)
D7 D6 D5 D4 D3 D2 D1 D0
Ack
by
784R
Frame 3
Data Byte
Stop
by
Master
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
Confidential, For Beta-site Only
-10 -
Publication Release Date: Sep.
1999
Revision 0.54
Share Link: 