THERMISTOR SENSOR CIRCUIT
LSI (lX2107YA) has a built-in A/D converter. Analog DC
Accordingly, the temperature detected by THERMISTOR
voltage input to
K
13
(LOW TEMP.) or
Kg
(HIGH TEMP.)
is input to K
1s
(LOW) and
Kg
(HIGH) input terminal of
terminal is digitally converted into temperature data.
LSI
(lX2107YA)
as analog DC voltage value.
The thermistor sensor circuit is basically constituted by
In case of VREP
=
Approx.
-6.4v
-
-6.8~
the potential division circuit for
R32
(LOW),
R31
(HIGH)
and THERMISTOR against the standard voltage of
R30
Temperatures 40°C through 1
10°C
are detected by the low
and ZD30.
side of the thermistor and 130°C through 250°C by the
high side.
R33
and
VR30
are provided for compensation and fine
adjustment of THERMISTOR (LOW) and
R34,
Rss
and
The following is the relationship between temperatures and
VRs
I
are provided for compensation and fine adjustment DC voltages at the input terminal of
LSI
(fX2167YA).
of THERMISTOR (HIGH).
I
THERMISTOR
CONVECTION
TEMP.
1-1
HIGH
130°c
-
-4.4v
150°c
-
-3.9v
180°C
-
-3.lV
2oo”c
-
-2.6V
220%
-
-2.ov
230°C
-
-1.8V
250°C
-
-1.2v
R30
I-‘
VDD
I I
I
1
+
-Iv
I
REF
l
LSi
R114
lsh
c.
K13
‘ZD30
R113
-
K9
k
l
R31
a-
41
D30
l
vR30
l
vFt31
l
R32
l R33
4
”
1
VI34
w4;-;-
i-1
IX2107YA
THERMISTOR
Figure 23. Thermistor Sensor Circuit
77
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