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9. Sensor Control Circuit
Convert the resistance variation of thermistor to the voltage variation.
R27 3.9K
warren.
TO PIN 4 OF 1C1
A
,
~~ a eo
THERMISTOR
R31
SENSOR
1K-F
PTM-312-91
R28 100K
TO PIN 5 OF IC1
TO PIN 6 OF IC1
10K
(Fig. 53) Sensor Control Circuit
OV
-5V
PIN 5
OV
-5V z
a
_
PIN 6
OV
Vi }----
EO
Tea
ee
fo cae ne eens eS em 256 Soe ie ot
eos, se
ew
PIN 4—
(Fig. 54) Waveform of Each Pin
45
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