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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 366K |
| 代理商： | FIC03272 |
Revised 06/04
8
TECHNICAL INFORMATION FOR FIC03272
FIC03272
AIN0
AIN1
R90
7
8
24
10k
30k
103
10k
220k
100p
8.2k
22k
30k
TLC271CP
104
1M
10k
47k
10
μ
5
6
7
3
2
4
2
3
87
6
4
10
9
8
104
100k
1m
+3. 8V
+4.4V
LM324N
LM324N
+5V
S
1
TH
Figure 4 - Circuit for driving sensor and processing sensor signal
A
IN1
(Pin No. 8) as a thermistor signal for the
temperature compensation circuit.
c) As a first stage, the sensor’s output (pin No. 3),
which is of very high impedance, should be
amplified by 4.5 times with a high impedance
(100M
or higher) operational amplifier, such as
Texas Instrument’s Model No. TLC271. This
amplified signal is designed to be further amplified
by ten times in the second stage. The output from
the amplifier is input into port A
IN0
(Pin No. 7)
after being adjusted by a regulator (differential
circuit) with a bias signal.
14
28
6
220
μ
1SS176
220
μ
6. 2V
1SS176
2. 2k
104
103
+4.4V
+5V
FIC03272
V
DD
V
AREF
V
SS
5V
+3.8V
5-2
Power supply circuit
As illustrated in Figure 5, the circuit is designed to
be operated by +5V. The sensor’s heater, which
requires a large current, is powered directly by +5V.
The microprocessor is powered by +4.4V (down-
stream from a diode). A diode is connected between
the power supply and the microprocessor to protect
the microprocessor from a surge current. Taking the
saturation voltage of the operational amplifiers into
consideration, the analog reference voltage (V
AREF
)
is set at +3.8V. Voltage is provided downstream from
another diode.
Figure 5 - Power supply circuit
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