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參數(shù)資料
| 型號(hào)： | FIC03272 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Microprocessor for handling signals from the TGS4161 carbon dioxide sensor |
| 中文描述： | 微處理器處理的TGS4161二氧化碳傳感器信號(hào) |
| 文件頁數(shù)： | 2/14頁 |
| 文件大小： | 366K |
| 代理商： | FIC03272 |
Revised 06/04
2
TECHNICAL INFORMATION FOR FIC03272
Figure 1 - Pin arrangement for FIC03272
Introduction
The FIC03272 is a microprocessor for handling signals
from the TGS4161 carbon dioxide sensor, enabling
maintenance-free automation of air quality control
in buildings when connected with appliances such
as ventilation fans, air cleaning systems, etc.
The microprocessor takes in the output voltage, or
electromotive force (EMF), from the TGS4161 sensor
and outputs a signal which corresponds to a
concentration of CO
2
in the environment. CO
2
concentrations are calculated in the microprocessor
based on
EMF, which is the change in the value of
EMF from the value in a normal clean environment.
The microprocessor also contains software to
compensate the sensor’s signal for changes in
temperature and basic environmental factors.
1. Features
1-1
Automatic calibration
The FIC03272 uses the concept of a benchmark value
of EMF in order to provide automatic calibration. The
benchmark value is assumed to be equal to the level
of CO
2
which exists in ambient air (approx. 400ppm).
CO
2
concentrations are calculated periodically by
determining the change of EMF from the benchmark
level (
EMF). In order to offset the effects of sensor
signal drift which are caused by environmental
temperature and air contaminants, the micro-
processor automatically renews the benchmark level
to the current EMF value whenever a lower CO
2
concentration than the current benchmark is
calculated. Using this method of automatic calibra-
tion, very stable characteristics can be expected for
the sensor, allowing for reliable monitoring of CO
2
levels and long term maintenance-free ventilation
control.
1-2
High CO
2
sensitivity and wide detectable range of
400~3000ppm
By programming the microprocessor to take into
consideration the unique performance characteristics
of the TGS4161, reliable readings of CO
2
concen-
trations within a wide range (400~3000ppm) can be
achieved, satisfying the requirements of building
ventilation control applications.
X
OUT
AIN1
AIN0
V
AREF
R70
RESET
X
IN
AIN2
R52
R51
R50
R43
R71
V
SS
1
10
9
8
7
6
5
4
3
2
11
12
13
14
15
16
17
18
20
21
19
22
23
24
25
26
28
27
R82
R90
R83
R63
R80
R81
R60
R61
R62
R53
R92
R91
KEO
V
DD
X-TAL
Input port for
microprocessor reset
Input port for
test mode
Input port for damper
control thresholds
Input port for +3.8V
Input port for +4.4V
Input port for setting
benchmark renewal (V
L
)
Input port for setting
benchmark renewal (T
K
)
Input port for automatic
benchmark reset (Tr)
GND
Input port for +4.4V
Output port for benchmark
renewal status signal
Output port for CO
2
concentration signal
Output port for
bias signal
GND
GND
GND
GND
Output port for green LED
Output port for red LED
Output port for damper
control signal
GND
Output port for malfunction signal
Gas sensor signal
input port
Thermistor signal
input port
Input port for setting
warm up period
Input port for manual
benchmark reset
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