W83627HF/ F/ HG/ G
7.3.3 Temperature Measurement Machine
The temperature data format is 8-bit two's-complement for sensor 2 and 9-bit two's-complement for
sensor 1. 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.
Table 1.
TEMPERATURE
8-BIT DIGITAL OUTPUT
8-BIT BINARY 8-BIT HEX
9-BIT DIGITAL OUTPUT
9-BIT BINARY 9-BIT HEX
+125°C
+25°C
+1°C
0111,1101
0001,1001
0000,0001
-
7Dh
19h
01h
-
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
0FAh
032h
002h
001h
000h
1FFh
1FFh
1CEh
192h
+0.5°C
+0°C
0000,0000
-
00h
-
-0.5°C
-1°C
1111,1111
1110,0111
1100,1001
FFh
E7h
C9h
-25°C
-55°C
7.3.3.1 Monitor temperature from thermistor：
The W83627HF 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 8.2, the themistor is connected by a serial resistor with 10K Ohms, then
connect to VREF （Pin 101）.
7.3.3.2 Monitor temperature from Pentium IITM thermal diode or bipolar transistor 2N3904
The W83627HF can alternate the thermistor to Pentium IITM （Deschutes） thermal diode interface or
transistor 2N3904 and the circuit connection is shown as Figure 8.3. The pin of Pentium IITM D- is con-
nected to power supply ground （GND） and the pin D+ is connected to pin VTINx in the W83627HF.
The resistor R=30K ohms should be connected to VREF to supply the diode bias current and the by-
pass 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.
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