W83697HG Datasheet, PDF (27/109 Pages) Winbond – WINBOND LPC I/O

W83697HF/ HG
The another negative voltage input V3 (approximate -5V) also can be evaluated by the similar method
and the serial resistors can be selected with R5=120K ohms and R6=56K ohms by the Winbond
recommended. The expression equation of V3 With -5V voltage is shown as follows.
V₃
=
N5VIN − VREF
1−γ
×γ
Where the γ is set to 120K/(120K+56K). If the monitored ADC value in the N5VIN channel is 0.8635,
VREF=3.6V and the parameter γ is 0.6818 then the negative voltage of V3 can be evalated to be -5V.
6.3.3 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.
TEMPERATURE
+125°C
+25°C
+1°C
+0.5°C
+0°C
-0.5°C
-1°C
-25°C
-55°C
8-BIT DIGITAL OUTPUT
8-BIT BINARY 8-BIT HEX
0111,1101
7Dh
0001,1001
19h
0000,0001
01h
-
-
0000,0000
00h
-
-
1111,1111
FFh
1110,0111
E7h
1100,1001
C9h
Table 2.
9-BIT DIGITAL OUTPUT
9-BIT BINARY
9-BIT HEX
0,1111,1010
0FAh
0,0011,0010
032h
0,0000,0010
002h
0,0000,0001
001h
0,0000,0000
000h
1,1111,1111
1FFh
1,1111,1110
1FFh
1,1100,1110
1CEh
1,1001,0010
192h
6.3.3.1. 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) β value is 3435K, (2) resistor value is 10K ohms
at 25°C. In the Figure 9.2, 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^TM thermal diode or bipolar transistor 2N3904
The W83697HF can alternate the thermistor to Pentium II^TM (Deschutes) thermal diode interface or
transistor 2N3904 and the circuit connection is shown as Figure 9.3. The pin of Pentium II^TM D- is
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.
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