W83L786R/ W83L786G
7.5   Temperature Measurement Machine
The temperature data format is 8-bit unsigned for thermal sensor. The 8-bit temperature data can be
obtained by reading the VR [25h], VR [26h] or VR [27h]. The format of the temperature data is shown
in Table 1.
TEMPERATURE
8-BIT DIGITAL OUTPUT
 
8-BIT BINARY
8-BIT HEX
+160癈
1010,0000
A0h
+25癈
0001,1001
19h
+2癈
0000,0010
02h
+1癈
0000,0001
01h
+0癈
0000,0000
00h
Table 1
7.5.1   Monitor Temperature from Thermistor
W83L786R/G can connect two thermistors and one thermal diode sensor to measure three different
environment temperatures. The specification of thermistor should be considered to (1) ?value is 3435
K, and (2) resistor value is 10K ohms at 25癈. In the Figure 3, the themistor is connected by a serial
resistor with 10K Ohms, and then connect to V
REF
 (pin 19).
7.5.2   Monitor Temperature from Thermal Diode
W83L786R/G can alternate the thermistor to thermal diode interface and the circuit connection is
shown as Figure 5. The pin of D- is connected to power supply ground (GND) and the pin D+ is
connected to pin D+ or VTIN1 in the W83L786R/G. The bypass capacitor C=2200pF should be added
to filter the high frequency noise.
C =  2  2  0  0  p  F
B   i p  o  l a  r T   r a  n  s  i s  t o  r
T   e  m   p  e  r a  t u  r e   s  e  n  s  o  r
2  N   3  9  0  4
C   =  2  2  0  0  p  F
D   +
V   T   I N   1
W 8 3 L  7 8 6 R
C   P  U    o  r G   P  U
D   +
D   -
T   h  e  r m   i n  a  l
D   i o  d  e
D   -
 
 
Figure 5
Publication Release Date: March 06
  - 12 -
Revision0.8
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