Revised 08/03
10
TECHNICAL INFORMATION FOR FIC03272
5-6 Circuit for manual benchmark reset
A circuit designed to allow for manual benchmark
reset is shown in Figure 9.
5-7 Circuit for clock signal generator
When a ceramic oscillator is connected with the
clock in and out ports, Xin and Xout (Pins No. 2
and 1 respectively), a clock signal is activated in
FIC03272 by a built-in clock signal generator. A
sample circuit for connecting such an oscillator is
shown in Figure 10. Murata Electronics model
CST4.19MGW is a well-matched ceramic oscillator
for FIC03272. Before using a different oscillator,
please consult with Figaro or the oscillator
manufacturer.
5-8 Circuit for damper control signal threshold
A recommended circuit design for setting the damper
control signal threshold can be seen in Figure 11.
5-9 Sample circuit of damper control with TGS4161 and
FIC03272
A sample application circuit for damper control when
using a TGS4161 CO2 sensor and a FIC03272
microprocessor is shown in Figure 12. Please refer to
Technical Information for AM-4-4161 for details.
KEO
FIC03272
10k
27
+4.4V
FIC03272
1
XIN
XOUT
2
CST4. 19 MGW
9
103
JP
1k
4. 3k
10k
24k
100k
10k
+3. 8V
JP
JP
JP
AIN2
FIC03272
Figure 9 - Manual benchmark reset circuit
Figure 10 - Clock signal generator circuit
Figure 11 - Damper control signal threshold circuit