w83637hg Winbond Electronics Corp America, w83637hg Datasheet - Page 33

• Manufacturer Part Number: w83637hg
• Description: Winbond Lpc I/o Lpc I/o
• Manufacturer: Winbond Electronics Corp America

6.3.3 Temperature Measurement Machine
The temperature data format is 8-bit two's-complement for sensor SYSTIN and 9-bit two's-complement
for sensor CPUTIN and VTIN. The 8-bit temperature data can be obtained by reading the CR[27h]. The
9-bit temperature data can be obtained by reading the 8 MSBs from the Bank1/Bank2 CR[50h] and the
LSB from the Bank1/Bank2 CR[51h] bit 7. The format of the temperature data is show in Table 1.
6.3.3.1 Monitor temperature from thermistor:
The W83637HF can connect three thermistors to measure three different envirment temperature. The
specification of thermistor should be considered to (1) β value is 3435K, (2) resistor value is 10K ohms
at 25°C. In the Figure 6.2, the themistor is connected by a serial resistor with 10K Ohms, then connect
to VREF (Pin 101).
6.3.3.2 Monitor temperature from Pentium II
The W83637HF can alternate the thermistor to Pentium II
transistor 2N3904 and the circuit connection is shown as Figure 6.3. The pin of Pentium II
III
W83637HF. The resistor R=30K ohms should be connected to VREF to supply the diode bias current
and the bypass capacitor C=3300pF should be added to filter the high frequency noise. The transistor
2N3904 should be connected to a form with a diode, that is, the Base (B) and Collector (C) in the
2N3904 should be tied together to act as a thermal diode.
TM
D- is connected to pin 111(CPUD-) and the pin D+ is connected to temperature sensor pin in the
transistor2N3904
Temperature
+125°C
+0.5°C
+25°C
-0.5°C
-25°C
-55°C
+1°C
+0°C
-1°C
8-Bit Binary
0111,1101
0001,1001
0000,0001
0000,0000
1111,1111
1110,0111
1100,1001
8-Bit Digital Output
-
-
TM
/Pentium III
8-Bit Hex
Table 1
7Dh
FFh
E7h
C9h
19h
01h
00h
- 28 -
-
-
TM
/Pentium III
TM
thermal diode or bipolar
0,1111,1010
0,0011,0010
0,0000,0010
0,0000,0001
0,0000,0000
1,1111,1111
1,1111,1110
1,1100,1110
1,1001,0010
9-Bit Binary
Publication Release Date: March, 2006
9-Bit Digital Output
TM
thermal diode interface or
W83637HF/HG
9-Bit Hex
1CEh
0FAh
1FFh
1FFh
032h
002h
001h
000h
192h
TM
/Pentium
Revision 1.6