W83781D Datasheet, PDF (17/53 Pages) Winbond – MONITORING IC

W83781D
PRELIMINARY
(f) Temperature 2/3 T_OS and T_HYST write
0
SCL
780
4
78
SDA
1 0 0 1 A2 A1 A0 R/W
0
0
0
0
0
0
D1 D0
Start By
Master
Frame 1
Ack
by
Frame 2
Ack
by
Serial Bus Address Byte
781D
Pointer Byte
781D
SCL (Cont...)
SDA (Cont...)
0
780
78
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Frame 3
MSB Data Byte
Ack
Ack
by
Frame 4
781D
LSB Data Byte
by
781D
Stop
by
Master
Configuration Register Write
7.2 Analog Inputs
The maximum input voltage of the analog pin is 4.096 because the 8-bit ADC has a 16mv LSB.
Really, the application of the PC monitoring would most often be connected to power suppliers. The
CPU V-core voltage and 3.3V can directly connected to these analog inputs. The +5V and +12V
inputs should be reduced a factor with external resistors so as to obtain the input range. As followed
figure is shown.
Vs
Positive Input
Vs
Negative Input
+2.5VINA
Positive Inputs _+2.5VINB
+3.3VIN
R1
VDD(+5V)
+12VIN
Pin 36
Pin 35
Pin 34
Pin 33
Pin 32
-12VIN ^{Pin 31} _-
R2
+
RF
-12VOUT ^{Pin 30}
-5VOUT Pin 29
RIN
-5VIN Pin 28
-
+
8-bit ADC
with
16mV LSB
Typical Thermister Connection
10K, 1%
RTHM
VREF
VTIN3
VTIN2
VTIN1
Pin 37
Pin 38
Pin 39
Pin 40
- 12 -
Publication Release Date : Nov. 1997
Revision 0.60