FIC98648 Datasheet, PDF (10/14 Pages) List of Unclassifed Manufacturers – Microprocessor for use with TGS4160 in automatic CO2 monitors

TECHNICAL INFORMATION FOR FIC98648
5-6 Circuit for manual benchmark reset
A circuit designed to allow for manual benchmark
reset is shown in Figure 9.
+4.4V
10k
FIC98648
27
KEO
Figure 9 - Manual benchmark reset circuit
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
FIC98648 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 FIC98648. Before using a different oscillator,
please consult with Figaro or the oscillator
manufacturer.
FIC98648
XIN
2
XOUT
1
CST4. 19 MGW
Figure 10 - Clock signal generator circuit
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.
+3. 8V
1k
JP
4. 3k
JP
10k
5-9 Sample circuit of damper control with TGS4160 and
FIC98648
JP
24k
A sample application circuit for damper control when
using a TGS4160 CO2 sensor and a FIC98648 _JP
100k
microprocessor is shown in Figure 12. Please refer to
Technical Information for AM-4 for details.
10k
FIC98648
9
AIN2
103
Figure 11 - Damper control signal threshold circuit
Revised 08/03
10