THERMISTOR SENSOR CIRCUIT
LSI
has a built-in A/D converter. Analog DC
Accordingly, the temperature detected by THERMISTOR
voltage input to K
(LOW TEMP.) or
(HIGH TEMP.)
is input to K
(LOW) and
(HIGH) input terminal of
terminal is digitally converted into temperature data.
LSI
as analog DC voltage value.
The thermistor sensor circuit is basically constituted by
In case of
the potential division circuit for
(LOW),
(HIGH)
and THERMISTOR against the standard voltage of
Temperatures
through 1
are detected by the low
and
side of the thermistor and 130°C through
by the
high side.
and
are provided for compensation and fine
adjustment of THERMISTOR (LOW) and
and
The following is the relationship between temperatures and
are provided for compensation and fine adjustment
DC voltages at the input terminal of
of THERMISTOR (HIGH).
THERMISTOR
CONVECTION
T E M P .
HIGH
-2.ov
250°C
R30
l
R114
K13
R113
l
R31
D30
l
vR30
l
vFt31
l
R32
l
R33
i-1
THERMISTOR
Figure 23. Thermistor Sensor Circuit
77
Summary of Contents for R-8320E
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