FIC03272 [ETC]
Microprocessor for handling signals from the TGS4161 carbon dioxide sensor; 微处理器从TGS4161二氧化碳传感器的信号处理
| 型号： | FIC03272 |
| 厂家： | 
ETC |
| 描述： | Microprocessor for handling signals from the TGS4161 carbon dioxide sensor |
| 文件： | 总14页 (文件大小：369K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL INFORMATION FOR FIC03272
Technical Information for FIC03272--microprocessor for
use with TGS4161 in automatic CO2 monitors
The FIC03272 is a microprocessor
for handling signals from the
TGS4161 carbon dioxide sensor.
This microprocessor enables
maintenance-free automation of
the air quality control in buildings
when connected with appliances
such as ventilation fans, air
cleaning systems, etc.
Page
Introduction.........................................................................................2
Features................................................................................................2
Basic Function...............................................................................................3
Pin Arrangement...........................................................................................3
Pin Functions
Pins for the initial setting of operational conditions....................................3
Gas sensor signal Vg input .........................................................................5
Thermistor signal VT input .......................................................................5
Bias signal output......................................................................................5
Manual benchmark reset signal input........................................................5
Sensor signal output....................................................................................5
LED display signal output..........................................................................6
Malfunction signal output.........................................................................6
Benchmark renewal status signal output........................................................6
Line test mode...........................................................................................7
Electrical Circuits for FIC03272........................................................................7
Hardware Specifications....................................................................................12
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY
WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY RECOMMENDS
CONSULTING OUR TECHNICALSTAFF BEFORE DEPLOYING FIGARO SENSORS INYOURAPPLICATION
AND, IN PARTICULAR, WHEN CUSTOMER’S TARGET GASES ARE NOT LISTED HEREIN. FIGARO
CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR
APPLICATION FOR WHICH SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.
Revised 06/04
1
TECHNICAL INFORMATION FOR FIC03272
Introduction
benchmark value is assumed to be equal to the level
of CO2 which exists in ambient air (approx. 400ppm).
The FIC03272 is a microprocessor for handling signals CO2 concentrations are calculated periodically by
from the TGS4161 carbon dioxide sensor, enabling determining the change of EMF from the benchmark
maintenance-free automation of air quality control level (∆EMF). In order to offset the effects of sensor
in buildings when connected with appliances such signal drift which are caused by environmental
as ventilation fans, air cleaning systems, etc.
temperature and air contaminants, the micro-
processor automatically renews the benchmark level
The microprocessor takes in the output voltage, or to the current EMF value whenever a lower CO2
electromotive force (EMF), from the TGS4161 sensor concentration than the current benchmark is
and outputs a signal which corresponds to a calculated. Using this method of automatic calibra-
concentration of CO2 in the environment. CO2 tion, very stable characteristics can be expected for
concentrations are calculated in the microprocessor the sensor, allowing for reliable monitoring of CO2
based on ∆EMF, which is the change in the value of levels and long term maintenance-free ventilation
EMF from the value in a normal clean environment. control.
The microprocessor also contains software to
compensate the sensor’s signal for changes in 1-2 High CO2 sensitivity and wide detectable range of
temperature and basic environmental factors.
400~3000ppm
By programming the microprocessor to take into
consideration the unique performance characteristics
of the TGS4161, reliable readings of CO2 concen-
trations within a wide range (400~3000ppm) can be
1. Features
1-1 Automatic calibration
The FIC03272 uses the concept of a benchmark value achieved, satisfying the requirements of building
of EMF in order to provide automatic calibration. The ventilation control applications.
Input port for +4.4V
X
OUT
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
DD
X-TAL
Input port for manual
benchmark reset
XIN
KEO
R92
R91
R90
R83
R82
R81
R80
R63
R62
R61
R60
R53
Input port for
microprocessor reset
Output port for benchmark
renewal status signal
RESET
R70
3
Input port for
test mode
Output port for CO
2
4
concentration signal
Output port for
bias signal
5
R71
Input port for +4.4V
Input port for +3.8V
V
AREF
6
GND
GND
Gas sensor signal
input port
AIN0
AIN1
AIN2
R43
7
Thermistor signal
input port
8
GND
GND
Input port for damper
control thresholds
9
Input port for setting
warm up period
Output port for green LED
10
Input port for setting
11 R50
12 R51
13 R52
Output port for red LED
benchmark renewal (V
L)
Input port for setting
benchmark renewal (TK)
Output port for malfunction signal
Output port for damper
control signal
Input port for automatic
benchmark reset (Tr)
14
VSS
GND
GND
Figure 1 - Pin arrangement for FIC03272
Revised 06/04
2
TECHNICAL INFORMATION FOR FIC03272
1-3 Two output signals
4-1 Pins for the initial setting of operational conditions
FIC03272 generates two separate output signals:
To optimize sensor performance, the following pins
a) For calculating CO2 concentrations, a pulse width are provided for setting operational conditions at the
modulated (PWM) signal is output. time of power-on. No change can be made to
b) An On/Off signal is generated as a control signal operational conditions after the initial setting without
for devices such as ventilation fans, dampers, etc. powering off and then repowering the device.
Notes:
4-1-1 Input signal for setting the sensor’s initial warm-
1) The microprocessor is designed to assume the
up time (Pin No. 10)
highest value of EMF reading is representative of Initial warm-up time, which is necessary to stabilize
400ppm of CO2 (ambient air levels). As a result, an the sensor’s output signal after an unpowered period,
accurate reading cannot be expected if the sensor is is set by input of a signal to port R43 (see Table 2).
used in an environment where CO2 constantly exists No signal can be taken from the microprocessor’s
at higher concentrations than can be found in a output ports during initial warm-up time.
normal clean environment.
Signal Input
2) This device is not suitable for usage in life saving
equipment.
Setting
"H"
30 minutes
"L"
Initial warm-up
time (T1)
2. Basic Functions
120 minutes
2-1 Initial setting of operational conditions
Table 2 - Initial warm-up time setting (AM-4-4161 default = "L")
In order to achieve optimal performance of the sensor,
manual preset of operational conditions is provided. 4-1-2 Input signals VL and TK for benchmark adjustment
(Pins No. 11 and 12)
2-2 Automatic operation
The benchmark level is normally set at the lowest
Once power is supplied, an initial warm-up timer is value of the sensor’s signal (Vg), which is considered
activated. When the initial warm-up time is finished, as 400ppm of CO2 (ambient levels). The benchmark
the microprocessor will automatically begin level Vg is renewed whenever a lower signal voltage
operation and commence generating the two output than the present benchmark level is read from the
signals mentioned above.
sensor (as described in Sec. 1-Automatic calibration).
If the benchmark level Vg is not renewed for a pre-
set period of time (TK), it is automatically adjusted
2-3 Line test
The microprocessor has the ability to perform a line upward by a pre-set voltage (VL) which corresponds
test for checking the functionality of the to an equivalent concentration of CO2. Table 3 shows
microprocessor and the surrounding circuits. This the user-determined settings for VL and TK which
allows users to eliminate tool testing which is can be selected by applying a signal to Ports R50 and
normally done on the production line after assembly. R51 respectively.
Terminal
Signal input
3. Pin Arrangement
Setting
Symbol
Pin No.
"H"
"L"
Benchmark
adjustment level
Pin arrangement of FIC03272 is shown in Figure 1.
4. Pin Functions
5ppm
20ppm
R50
R51
11
equivalent equivalent
(VL)
Benchmark
adjustment time
12
1 day
7 days
(TK)
The basic pin functions of FIC03272 are shown in
Table 1 (shown on Page 4).
Table 3 - Benchmark adjustment level and timer setting
(AM-4-4161 default = 20ppm equiv. and 1 day)
Revised 06/04
3
TECHNICAL INFORMATION FOR FIC03272
Terminal
Category
Functions
Pin
No.
Name
Symbol
Power supply
Ground
VDD
VSS
28 Connect to +4.4V power supply
14 Connect to ground
Power
Connect to 3.8V power supply (Reference voltage for A/D
converter)
Reference voltage
Reset
VAREF
6
Microprocessor reset when "L" is input for one machine
cycle or longer
RESET
3
Microprocessor
control
Clock in
XIN
XOUT
R43
2
Connect to ceramic oscillator of 4.19MHz
(ports to internal clock circuit)
Clock out
1
Initial warm-up time
10
Benchmark adjustment
level (VL)
R50
11
Input optional "H" or "L" signal
See Sec. 4-1 - Pins for initial setting of operation conditions
Settings
Benchmark adjustment
time (TK)
R51
R52
12
Auto reset time
13
Input gas sensor signal (Vg)
See Sec. 4-2 - Gas sensor signal Vg input
Gas sensor signal (Vg)
AIN0
7
Analog signal
input
Thermistor signal (VT) for temperature compensation circuit
See Sec. 4-3 - Thermistor signal VT input
Thermistor signal (VT)
Control signal threshold
AIN1
AIN2
KEO
8
Calibration of CO2 levels for damper control
See Sec. 4-1-4 - Input signal for damper control
9
Manual benchmark
reset
Switch input
Signal output
27 See Sec. 4-5 - Manual benchmark reset signal input
Bias signal
R90
R60
24 See Sec. 4-4 - Bias signal output
Damper control signal
16 See Sec. 4-6-2 - Damper control signal output
CO2 concentration
signal
R91
25 See Sec. 4-6-1 - PWM signal output for CO2 concentration
Green LED
R63
R62
R70
R61
19 See Sec. 4-7 - LED display signal output
18 See Sec. 4-7 - LED display signal output
Red LED
Test mode (Input)
Malfunction (Output)
4
See Sec. 4-10 - Line test mode
17 See Sec. 4-8 - Malfunction signal output
Other
Benchmark renewal
status (Output)
R92
26 See Sec. 4-9 - Benchmark renewal status signal output
Table 1 - Pin functions of FIC03272
Revised 06/04
4
TECHNICAL INFORMATION FOR FIC03272
4-1-3 Input signal Tr for automatic benchmark reset (Pin output voltage is reversed, amplified and adjusted
No. 13)
(please refer to Figure 3, Sec. 4-4, and Sec. 5-1 for
Whenever the benchmark level Vg has only been details). The result of this process is a gas sensor signal
adjusted (Sec. 4-1-2) and has not been renewed (Sec. Vg with good resolution and which increases/
1-1) for a pre-set period of time (Tr), it should be auto- decreases as CO2 concentration increases/decreases.
matically reset at the current output signal in ambient This gas sensor signal Vg is input to port AIN0.
air. Table 4 shows the time intervals (Tr) which can
be pre-set by applying a signal to Port R52.
4-3 Thermistor signal VT input (Pin No. 8)
To compensate for the temperature dependency of
CO2 sensor, a signal from an external thermistor (VT)
is input to port AIN1.
Signal Input
Setting
"H"
"L"
Auto reset time
(Tr)
4-4 Bias signal output (Pin No. 24)
7 days
30 days
A PWM signal, of which the pulse width is variable,
is output from port R90. To optimize the resolution
of Vg readings, this signal is introduced to the
differential circuit after being converted to an analog
Table 4 - Auto reset timer setting (AM-4-4161 default = 7 days)
4-1-4 Input signal for damper control (Pin No. 9)
Concentration levels of CO2 at which the damper voltage, and adjusts the benchmark level Vg to fall
control signals are activated are selected by inputting between 25 and 51 counts at AD converted value, or
a voltage signal to port AIN2. Sensor output voltage 0.38 ~ 0.75V at 3.8V full scale. The bias signal starts
is first AD converted within the microprocessor. The from 128 counts (1.9V at 3.8V full scale) when the
relationship between theseAD converted values and power is switched on, and reduces the count stepwise
CO2 concentrations is shown in Table 5. Whenever a along with the sensor’s initial action until Vg falls
CO2 concentration exceeds the threshold level for and then stabilizes at the above stated level.
opening the damper (Cd1), a low signal (L) is output
from port R60. Ahigh signal (H) is output for closing 4-5 Manual benchmark reset signal input (Pin No. 27)
the damper when the CO2 concentration drops The benchmark level can be reset manually at any
beneath the Cd2 level. Figure 11 shows the circuit time by inputting an “L” pulse to port KEO. This
for damper control signal threshold. Please note that manual benchmark reset should be done in a clean
a high signal (H) is designed to be output during the atmosphere where the CO2 concentration is about
sensor’s initial warm-up period and also whenever 400ppm (please refer to Sec. 5-6 - Benchmark reset
the malfunction signal is activated.
circuit).
Note: If the benchmark level is manually reset under
a high CO2 concentration environment, the device’s
sensitivity would be decreased and calculated CO2
concentration values would be less than the actual
concentration.
Signal input
Cd1 (ppm)
Cd2 (ppm)
(AD converted: 0-255*)
0 - 48
49 - 96
800
720
800
1000
1500
2000
3000
97 - 144
145 - 192
193 - 255
1300
1800
2700
4-6 Sensor signal output
4-6-1 PWMsignaloutputforCO2 concentration(PinNo. 25)
A PWM signal is output from port R91 to show CO2
Cd1: Threshold for OPEN signal
Cd2: Threshold for CLOSE signal
* 8-bit - Least significant byte=3.8V/256
Table 5 - Thresholds for damper OPEN/CLOSE signal
4-2 Gas sensor signal Vg input (Pin No. 7)
Since the raw sensor output voltage (EMF) actually
decreases as CO2 concentration increases, the sensor’s
Revised 06/04
5
TECHNICAL INFORMATION FOR FIC03272
H
concentration readings. The pulse width against a
cycle corresponds to the CO2 concentration as shown
in Figure 2. This pulse width is then converted to an
analog output voltage between 0 ~ 3V by the circuit
(please refer to Sec. 5-4 - CO2 concentration circuit).
L
A
B
C
A: [(CO
B: C - [(CO
C: approx. 65msec.
2
concentration) / 3000] x C
Approx. 65 msec.
2
concentration) / 3000] x C
4-6-2 Damper control signal output (Pin No. 16)
The output from port R60 is set to “H” under normal
conditions in a clean environment, indicating that the
damper should be closed. When a CO2 reading
Figure 2 - PWM signal for CO2 concentration
continuously from R63 during this period.
exceeds the preset level of the Open Damper 4-8 Malfunction signal output (Pin No. 17)
An “H” signal is output from port R61 under normal
operation conditions. When a malfunction is detected on
Threshold (Cd1) as shown in Table 2, an “L” signal is
output from port R60 as a signal for opening the
damper. When CO2 drops below the preset level of the benchmark level Vg, an “L” signal is output from port
R61. The following condition would generate a
malfunction signal:
the Close Damper Threshold (Cd2), the output from
port R60 returns to an “H” signal for closing a
damper. “H” is also output from port R60 during
initial warm-up time and whenever a malfunction
signal is output.
Benchmark level Vg malfunction—when the
benchmark level Vg (gas sensor’s signal) cannot
be adjusted in the range between 25 and 51 counts
at AD converted value within 10 minutes after
the adjustment is started, a malfunction is
considered to have occurred.
4-7 LED display signal output (Pin Nos. 18 & 19)
The following LED display signals are output from
port R62 (red LED) and port R63 (green LED):
The relationship between signal output ports and
their output signals under malfunction mode can be
4-7-1 Initial warm-up time
During the initial warm-up period (see Sec. 4-1-1),
an alternating H/L signal is output from port R63 seen in Table 6.
every 0.5 seconds, causing the green LED to alternate
Because a thermistor is not built into the TGS4161, a
heater breakage detection circuit cannot be used in
conunction with TGS4161.
between on and off every 0.5 seconds. “L” is output
continuously from R62 during this period.
4-7-2 Normal operation mode
Terminal
Signal
Indication
When the CO2 concentration is lower than the preset
threshold level for the damper control (Cd1), “L” is
output from port R62 and “H” is output from the
R63, causing the green LED to be lit continuously.
Conversely, if the CO2 concentration is higher than
the preset threshold level for the damper control
(Cd1), “H” is output from port R62 and “L” is output
from port R63, causing the red LED to be lit
continuously.
CO
signal (R91)
2 concentration
“L” signal
0ppm
Damper control
signal (R60)
“H” signal
Close
Alternate H/L signal
(0.5 sec./0.5 sec.)
Red LED (R62)
On/Off
Green LED (R63)
Bias signal (R90)
“L” signal
Off
Off
Hold the level
Table 6 - Malfunction signal
4-9 Benchmark renewal status signal output (Pin No. 26)
4-7-3 Malfunction mode
When the benchmark level has been renewed, an “L”
When a malfunction has been detected (see Sec. 4-8),
an alternating H/L signal is output from port R62 signal is output from port R92 for one second to
indicate the status. An “H” signal is normally output
from this port.
every 0.5 seconds, causing the red LED to alternate
between on and off every 0.5 seconds. “L” is output
Revised 06/04
6
TECHNICAL INFORMATION FOR FIC03272
4-10 Line test mode (Pin No. 4)
shown in Table 7. After powering on, signal outputs
A line test mode can be activated by the input of an change from Step 1 to Step 4 according to the table,
“L” signal to port R70 at the moment of power supply. with Steps 1-3 lasting 5 seconds each. Afterwards,
Operation of the microprocessor and the surrounding Step 4 outputs will be maintained continuously until
circuits will be tested according to the schedule the power is shut off.
Terminal
Symbol
Signal Output
Name
Pin No.
Step 1
Step 2
Step 3
Step 4
CO
2
concentration
signal
Cd1 (ppm)
Note *1
R91
R90
25
Cd1 (ppm)
255
Cd1 (ppm)
Cd1 (ppm)
Bias signal
24
0
128
128
Note *2
Green LED
Red LED
R63
R62
19
18
L
H
L
(Note 3)
(Note 4)
H
H
H
Damper control
signal
R60
R61
R92
16
17
26
H
H
H
L
L
L
(Note 5)
(Note 6)
H
H
H
H
Malfunction
Benchmark
renewal status
Notes:
(1) Please refer to Sec. 4-1-4 - Input signal for damper control
(2) Please refer to Sec. 4-4 - Bias signal output
(3) H or L, as input to Pin #10 for initial warmup setting - refer to Sec. 4-1-1
(4) H or L, as input to Pin #11 for benchmark adjustment - refer to Sec. 4-1-2
(5) H or L, as input to Pin #12 for benchmark adjustment - refer to Sec. 4-1-2
(6) H or L, as input to Pin #13 for benchmark reset - refer to Sec. 4-1-3
(7) Outputs shown are held until power is shut off
Table 7 - Line test mode
5. Electrical Circuit for FIC03272
and Figure 4 (Page 8) respectively. Please note the
following items:
The following peripheral circuits are suggested when a) +5.0V should be applied to Pin No. 6 for the heater
using the FIC03272 with the TGS4161 sensor.
of TGS4161.
b) +3.8V is the specified voltage to sensor pin No. 5
for the built-in thermistor which is connected in
series with an 8.2kΩ resistor. Output voltage across
the 8.2kΩ resistor is designed to be input to port
5-1 Circuit for driving sensor and for processing sensor signals
The block/circuit diagrams for driving the sensor and
processing its signals are shown in Figure 3 (below)
+3.8V
+5V
FIC03272
Heater
voltage
(VH)
Sensor
voltage
(EMF)
4.5 times
amplification
circuit
10 times
amplification
circuit
Thermistor
signal (VT)
Regulation
circuit
Buffer
circuit
+
+
Buffer
circuit
Bias signal (PWM signal)
Convert to DC
Figure 3 - Block diagram for driving sensor and processing sensor signal
Revised 06/04
7
TECHNICAL INFORMATION FOR FIC03272
FIC03272
AIN0
10k
7
10µ
104
220k
+5V
+3. 8V
TLC271CP
8
22k
3
7
6
9
8
2
3
1
2
10
4
LM324N
TH
30k
8
30k
4
AIN1
R90
100p
103
+4 .4V
10k
8.2k
1M
100k
10k
6
5
24
7
1m
LM324N
47k
104
Figure 4 - Circuit for driving sensor and processing sensor signal
AIN1 (Pin No. 8) as a thermistor signal for the 5-2 Power supply circuit
temperature compensation circuit. As illustrated in Figure 5, the circuit is designed to
c) As a first stage, the sensor’s output (pin No. 3), be operated by +5V. The sensor’s heater, which
which is of very high impedance, should be requires a large current, is powered directly by +5V.
amplified by 4.5 times with a high impedance The microprocessor is powered by +4.4V (down-
(100MΩ or higher) operational amplifier, such as stream from a diode). A diode is connected between
Texas Instrument’s Model No. TLC271. This the power supply and the microprocessor to protect
amplified signal is designed to be further amplified the microprocessor from a surge current. Taking the
by ten times in the second stage. The output from saturation voltage of the operational amplifiers into
the amplifier is input into port AIN0 (Pin No. 7) consideration, the analog reference voltage (VAREF)
after being adjusted by a regulator (differential is set at +3.8V. Voltage is provided downstream from
circuit) with a bias signal.
another diode.
FIC03272
+5V
+4.4V
1SS176
28
VDD
+3.8
V
1SS176
6
VAREF
5V
µ
2. 2k
µ
103
104
220
220
6. 2V
14
VSS
Figure 5 - Power supply circuit
Revised 06/04
8
TECHNICAL INFORMATION FOR FIC03272
5-3 System reset circuit
+4.4V
Under normal operating conditions, an “H” signal is
continuously applied to the RESET port (Pin #3).
When an “L” signal is applied to the RESET port for
a period of one machine cycle or longer, the internal
logic circuit of FIC03272 and the micro-processor’s
program return to the same condition which exists
just after powering on the unit, effectively resetting
the system.
FIC03272
2SA1015Y
28
VDD
1k
104
3
RESET
4. 7 k
3.9k
103
14
VSS
To perform the above described system reset function
automatically, a circuit such as that shown in Figure
6 is suggested. This kind of automatic system reset
circuit is useful in circumstances such as just after
powering on, after a momentary power interruption,
at the moment of recovery after a sudden drop of
Figure 6 - Reset circuit
DC. A delay of several seconds is anticipated in the
DC voltage concentration signal because a C-R
voltage, etc. The microprocessor’s program some- combination is used in the circuit. A 100Ω resistor is
connected in series to protect the external circuit from
excessive current.
times does not run correctly in these cases due to a
malfunction of the internal logic circuit in the
processor. Manual resets help to assure normal
operation of the microprocessor’s program.
5-5 Circuit for damper control signal
Figure 8 shows an example circuit in which an H/L
signal which is output from port R60 (Pin No. 16)
5-4 CO2 concentration signal circuit
Port 91 (Pin No. 25) outputs a PWM signal which and converted to an On/Off signal for controlling
the opening/closing of a damper. A 100Ω resistor is
connected in series to protect the external circuit from
represents a CO2 concentration in the range between
400 and 3000ppm. Figure 7 illustrates a sample circuit
for converting a PWM signal to a linear output of 0~3V excessive current.
1M
FIC03272
2
3
10k
Analog output (0~3V)
for CO concentration
1
25
R91
2
100
6.2V
1M
22k
LM 324N
10µ
Figure 7 - CO2 concentration signal circuit
10k
FIC03272
2SA1015Y
10k
16
R60
100
1k
Damper control signal
6. 2V
Figure 8 - Damper control circuit
Revised 06/04
9
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.
+4.4V
FIC03272
10k
27
KEO
Figure 9 - Manual benchmark reset circuit
5-7 Circuit for clock signal generator
FIC03272
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.
XIN
XOUT
2
1
CST4. 19MGW
Figure 10 - Clock signal generator circuit
+3. 8V
5-8 Circuit for damper control signal threshold
Arecommended circuit design for setting the damper
control signal threshold can be seen in Figure 11.
1k
JP
JP
JP
JP
4. 3k
10k
FIC03272
5-9 Sample circuit of damper control with TGS4161 and
FIC03272
Asample 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.
24k
100k
10k
9
AIN2
103
Figure 11 - Damper control signal threshold circuit
Revised 06/04
10
TECHNICAL INFORMATION FOR FIC03272
S E N S O R
~
5
Figure 12 - Application circuit
Revised 06/04
11
TECHNICAL INFORMATION FOR FIC03272
6. Hardware Specifications
*8-bit successive approximate type A/D converter
with sample and hold
6-1 Features
- 8 analog inputs
*4-bit single chip microcomputer
*Instruction execution time: 1.0µs (at 8MHz)
*Low voltage operation: 2.2V (at 4.2MHz)
*Basic instructions: 92
- Conversion time: 24µs (at 8MHz)
*Serial Interface with 8-bit buffer
- Simultaneous transmission and reception
capability
- ROM table look-up instructions
- 5-bit to 8-bit data conversion instruction
*Subroutine nesting: 15 levels maximum
*6 interrupt sources (External: 2, Internal: 4)
- 8/4-bit transfer, external/internal clock, and
leading/trailing edge shift mode
*Zero-cross detector (and external interrupt handler)
*Pulse output
- All sources each have independent latches, and
multiple interrupt control is available
*I/O port (23 pins)
- Buzzer drive/Remocon carrier
*High current outputs
- LED direct drive capacity: typ. 20mA x 8 bits
(Ports R5, R6)
*Two 12-bit Timer/Counters
- Timer, event counter, and pulse width measure- *Reset function
ment mode
- Watchdog timer reset
*Interval Timer
*Hold function
*Emulation pod: BM47C443
- Battery/Capacitor back-up
6-2 DC characteristics (see Table 8)
Parameter Symbol
Pins
Conditions
Min.
Typ.
Max.
Unit
Hysteresis
VHS
Hysteresis input
-
-
0.7
-
V
voltage
IIN1
RESET, HOLD
Open drain ports
Input
current
VDD = 5.5V, VIN = 5.5V/0V
-
-
-
±2
µA
kΩ
IIN2
Input
RIN
RESET
100
220
450
resistance
Output
leakage
current
Open drain
output ports
ILO
VOL
IOL
VDD = 5.5 V, VOUT = 5.5 V
-
-
2
µA
V
VDD = 4.5V, IOL = 1.6mA
-
-
-
-
0.4
0.1
Output low
voltage
Ports
R4, R7, R8, R9
VDD = 2.2V, IOL = 20µA
Output low
current
Ports R5, R6
VDD = 4.5V, VOL = 1.0V
7
20
-
mA
Supply
current
(NORMAL
operating
mode)
VDD = 5.5V, fc = 4MHz
VDD = 3.0V, fc = 4MHz
VDD = 3.0V, fc = 400kHz
-
-
-
2
1
4
2
1
IDD
-
mA
0.5
Supply
current
(HOLD
operating
mode)
IDDH
-
VDD = 5.5V
-
0.5
10
µA
Table 8 - DC characteristics
(Vss = 0, Topr = -30~+70˚C)
Revised 06/04
12
TECHNICAL INFORMATION FOR FIC03272
6-3 A/D conversion characteristics (Table 9)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Analog reference voltage
V
AREF
∆VAREF
AIN
(Mask option)
V
DD - 1.5
-
V
DD
V
Analog reference
voltage range
VAREF - Vss
2.7
-
-
V
Analog input voltage
Analog supply current
Nonlinearity error
Zero point error
Full scale error
V
-
-
Vss
-
0.5
-
V
DD
V
I
REF
-
-
-
-
-
1.0
mA
±1
±1
±1
±2
VDD = 2.7 ~5.5V
-
-
V
AREF = VDD ± 0.001V
LSB
-
Vss = 0.000V
Total error
-
Table 9 - A/D conversion characteristics
(Topr = -30~+70˚C)
6-4 AC characteristics (Table 10)
Parameter
Symbol
Condition
Min.
1.0
1.9
3.2
60
Typ.
Max.
Unit
V
DD = 2.7~5.5V
DD = 2.2~5.5V
Instruction Cycle Time
-
20
µs
t
cy
V
in RC oscillation
V
V
V
V
DD≥2.7V
High level clock pulse width
Low level clock pulse width
t
WCH
For external
clock
(XIN input)
DD<2.7V
DD≥2.7V
DD<2.7V
120
60
-
-
ns
t
WCL
120
-
A/D Conversion Time
A/D Sampling Time
Shift data Hold Time
-
-
-
-
-
-
t
ADC
24
t
cy
µs
-
t
AIN
2
t
cy
-
ns
t
SDH
0.5tcy-300
Table 9 - A/D conversion characteristics
(Vss = 0, Topr = -30~+70˚C)
Revised 06/04
13
TECHNICAL INFORMATION FOR FIC03272
6-5 Dimensions
Dimensions of FIC03272 are shown in Figure 13.
28
15
1
14
26.1 Max.
25.6 ± 0.2
1.243 Typ
1.0±0.1
0.46±0.1
M
0.18
1.778
Figure 13 - Dimensions of FIC03272
Figaro Engineering Inc. (Figaro) reserves the right to convey any license under its patent rights, nor the
make changes without notice to any products herein rights of others.
to improve reliability, functioning or design.
Information contained in this document is believed Figaro's products are not authorized for use as critical
to be reliable. However, Figaro does not assume any components in life support applications wherein a
liability arising out of the application or use of any failure or malfunction of the products may result in
product or circuit described herein; neither does it injury or threat to life.
FIGARO GROUP
HEAD OFFICE
OVERSEAS
Figaro Engineering Inc.
1-5-11 Senba-nishi
Mino, Osaka 562 JAPAN
Tel.: (81) 72-728-2561
Fax: (81) 72-728-0467
email: figaro@figaro.co.jp
Figaro USA Inc.
3703 West Lake Ave. Suite 203
Glenview, IL 60026 USA
Tel.: (1) 847-832-1701
Fax.: (1) 847-832-1705
email: figarousa@figarosensor.com
Revised 06/04
14
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