W83697HFFDC Information Storage Devices, Inc, W83697HFFDC Datasheet - Page 96

• Manufacturer Part Number: W83697HFFDC
• Description: LPC Interface I/o Plus Game/midi Port, Fan Control, Flash ROM I/f
• Manufacturer: Information Storage Devices, Inc

9.3.3
The temperature data format is 8-bit two's-complement for sensor 1 and 9-bit two's-complement for
sensor 2. 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 CR[50h] and the LSB from the Bank1 CR[51h]
bit 7. The format of the temperature data is show in Table 1.
9.3.3.1 Monitor temperature from thermistor:
The W83697HF can connect three thermistors to measure three different envirment temperature. The
specification of thermistor should be considered to (1)
25 C. In the Figure 9.2, the themistor is connected by a serial resistor with 10K Ohms, then connect to
VREF (Pin 101).
9.3.3.2 Monitor temperature from Pentium II
The W83697HF can alternate the thermistor to Pentium II
transistor 2N3904 and the circuit connection is shown as Figure 9.3. The pin of Pentium II
connected to power supply ground (GND) and the pin D+ is connected to pin VTINx in the W83697HF.
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 togeter to act as a thermal diode.
Temperature Measurement Machine
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
8-Bit Hex
Table 2.
- 87 -
thermal diode or bipolar transistor 2N3904
7Dh
FFh
E7h
C9h
19h
01h
00h
-
-
value is 3435K, (2) resistor value is 10K ohms at
TM
(Deschutes) thermal diode interface or
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
Publication Release Date: Feb. 2002
9-Bit Binary
9-Bit Digital Output
W83697HF/F
9-Bit Hex
0FAh
1CEh
1FFh
1FFh
TM
032h
002h
001h
000h
192h
Revision 0.70
D- is