Revised 06/04 1
TECHNICAL INFORMATION FOR FIC03272
Technical Information for FIC03272--microprocessor for
use with TGS4161 in automatic CO
2
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
an ISO9001 company
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY
WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY RECOMMENDS
CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION
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 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 CO2 in the environment. CO2
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 CO2 which exists in ambient air (approx. 400ppm).
CO2 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 CO2
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 CO2
levels and long term maintenance-free ventilation
control.
1-2 High CO2 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 CO2 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
Revised 06/04 3
TECHNICAL INFORMATION FOR FIC03272
1-3 Two output signals
FIC03272 generates two separate output signals:
a) For calculating CO2 concentrations, a pulse width
modulated (PWM) signal is output.
b) An On/Off signal is generated as a control signal
for devices such as ventilation fans, dampers, etc.
Notes:
1) The microprocessor is designed to assume the
highest value of EMF reading is representative of
400ppm of CO2 (ambient air levels). As a result, an
accurate reading cannot be expected if the sensor is
used in an environment where CO2 constantly exists
at higher concentrations than can be found in a
normal clean environment.
2) This device is not suitable for usage in life saving
equipment.
2. Basic Functions
2-1 Initial setting of operational conditions
In order to achieve optimal performance of the sensor,
manual preset of operational conditions is provided.
2-2 Automatic operation
Once power is supplied, an initial warm-up timer is
activated. When the initial warm-up time is finished,
the microprocessor will automatically begin
operation and commence generating the two output
signals mentioned above.
2-3 Line test
The microprocessor has the ability to perform a line
test for checking the functionality of the
microprocessor and the surrounding circuits. This
allows users to eliminate tool testing which is
normally done on the production line after assembly.
3. Pin Arrangement
Pin arrangement of FIC03272 is shown in Figure 1.
4. Pin Functions
The basic pin functions of FIC03272 are shown in
Table 1 (shown on Page 4).
4-1 Pins for the initial setting of operational conditions
To optimize sensor performance, the following pins
are provided for setting operational conditions at the
time of power-on. No change can be made to
operational conditions after the initial setting without
powering off and then repowering the device.
4-1-1 Input signal for setting the sensor’s initial warm-
up time (Pin No. 10)
Initial warm-up time, which is necessary to stabilize
the sensor’s output signal after an unpowered period,
is set by input of a signal to port R43 (see Table 2).
No signal can be taken from the microprocessor’s
output ports during initial warm-up time.
4-1-2 Input signals VL and TK for benchmark adjustment
(Pins No. 11 and 12)
The benchmark level is normally set at the lowest
value of the sensor’s signal (Vg), which is considered
as 400ppm of CO2 (ambient levels). The benchmark
level Vg is renewed whenever a lower signal voltage
than the present benchmark level is read from the
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
upward by a pre-set voltage (VL) which corresponds
to an equivalent concentration of CO2. Table 3 shows
the user-determined settings for VL and TK which
can be selected by applying a signal to Ports R50 and
R51 respectively.
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"H" "L"
pu-mrawlaitinI )1T(emit setunim03setunim021
Table 2 - Initial warm-up time setting (AM-4-4161 default = "L")
gnitteS lanimreT tupnilangiS
lobmyS .oNniP "H" "L"
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mpp5
tnelaviuqe mpp02
tnelaviuqe
kramhcneB
emittnemtsujda
T(
K)15R21yad1syad7
Table 3 - Benchmark adjustment level and timer setting
(AM-4-4161 default = 20ppm equiv. and 1 day)
Revised 06/04 4
TECHNICAL INFORMATION FOR FIC03272
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tuptuolangiS
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DELneerG36R91eeS tuptuolangisyalpsidDEL-7-4.ceS
DELdeR26R81eeS tuptuolangisyalpsidDEL-7-4.ceS
rehtO
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)tuptuO(noitcnuflaM16R71eeS tuptuolangisnoitcnuflaM-8-4.ceS
lawenerkramhcneB )tuptuO(sutats 29R62eeS tuptuolangissutatslawenerkramhcneB-9-4.ceS
Table 1 - Pin functions of FIC03272
Revised 06/04 5
TECHNICAL INFORMATION FOR FIC03272
4-1-3 Input signal Tr for automatic benchmark reset (Pin
No. 13)
Whenever the benchmark level Vg has only been
adjusted (Sec. 4-1-2) and has not been renewed (Sec.
1-1) for a pre-set period of time (Tr), it should be auto-
matically reset at the current output signal in ambient
air. Table 4 shows the time intervals (Tr) which can
be pre-set by applying a signal to Port R52.
4-1-4 Input signal for damper control (Pin No. 9)
Concentration levels of CO2 at which the damper
control signals are activated are selected by inputting
a voltage signal to port AIN2. Sensor output voltage
is first AD converted within the microprocessor. The
relationship between these AD converted values and
CO2 concentrations is shown in Table 5. Whenever a
CO2 concentration exceeds the threshold level for
opening the damper (Cd1), a low signal (L) is output
from port R60. A high signal (H) is output for closing
the damper when the CO2 concentration drops
beneath the Cd2 level. Figure 11 shows the circuit
for damper control signal threshold. Please note that
a high signal (H) is designed to be output during the
sensor’s initial warm-up period and also whenever
the malfunction signal is activated.
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
output voltage is reversed, amplified and adjusted
(please refer to Figure 3, Sec. 4-4, and Sec. 5-1 for
details). The result of this process is a gas sensor signal
Vg with good resolution and which increases/
decreases as CO2 concentration increases/decreases.
This gas sensor signal Vg is input to port AIN0.
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.
4-4 Bias signal output (Pin No. 24)
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
voltage, and adjusts the benchmark level Vg to fall
between 25 and 51 counts at AD converted value, or
0.38 ~ 0.75V at 3.8V full scale. The bias signal starts
from 128 counts (1.9V at 3.8V full scale) when the
power is switched on, and reduces the count stepwise
along with the sensor’s initial action until Vg falls
and then stabilizes at the above stated level.
4-5 Manual benchmark reset signal input (Pin No. 27)
The benchmark level can be reset manually at any
time by inputting an “L” pulse to port KEO. This
manual benchmark reset should be done in a clean
atmosphere where the CO2 concentration is about
400ppm (please refer to Sec. 5-6 - Benchmark reset
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.
4-6 Sensor signal output
4-6-1 PWM signal output for CO2 concentration (Pin No. 25)
A PWM signal is output from port R91 to show CO2
gnitteS tupnIlangiS
"H" "L"
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Table 4 - Auto reset timer setting (AM-4-4161 default = 7 days)
tupnilangiS
)*552-0:detrevnocDA(
)mpp(1dC )mpp(2dC
84-0008027
69-940001008
441-7900510031
291-54100020081
552-39100030072
Table 5 - Thresholds for damper OPEN/CLOSE signal
Cd1: Threshold for OPEN signal
Cd2: Threshold for CLOSE signal
* 8-bit - Least significant byte=3.8V/256
Revised 06/04 6
TECHNICAL INFORMATION FOR FIC03272
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).
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
exceeds the preset level of the Open Damper
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 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.
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):
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
every 0.5 seconds, causing the green LED to alternate
between on and off every 0.5 seconds. “L” is output
continuously from R62 during this period.
4-7-2 Normal operation mode
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.
4-7-3 Malfunction mode
When a malfunction has been detected (see Sec. 4-8),
an alternating H/L signal is output from port R62
every 0.5 seconds, causing the red LED to alternate
between on and off every 0.5 seconds. “L” is output
continuously from R63 during this period.
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
the benchmark level Vg, an “L” signal is output from port
R61. The following condition would generate a
malfunction signal:
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.
The relationship between signal output ports and
their output signals under malfunction mode can be
seen in Table 6.
Because a thermistor is not built into the TGS4161, a
heater breakage detection circuit cannot be used in
conunction with TGS4161.
4-9 Benchmark renewal status signal output (Pin No. 26)
When the benchmark level has been renewed, an “L”
signal is output from port R92 for one second to
indicate the status. An “H” signal is normally output
from this port.
H
LAB
C
Approx. 65 msec.
A: [(CO
2
concentration) / 3000 ] x C
B: C - [(CO
2
concentration) / 3000] x C
C: approx. 65msec.
Figure 2 - PWM signal for CO2 concentration
lanimreT langiS noitacidnI
OC
2
noitartnecnoc )19R(langis langis”L“mpp0
lortnocrepmaD
)06R(langis langis”H“esolC
)26R(DELdeR langisL/HetanretlA
).ces5.0/.ces5.0( ffO/nO
)36R(DELneerGlangis”L“ffO
)09R(langissaiBlevelehtdloHffO
Table 6 - Malfunction signal
Revised 06/04 7
TECHNICAL INFORMATION FOR FIC03272
4-10 Line test mode (Pin No. 4)
A line test mode can be activated by the input of an
“L” signal to port R70 at the moment of power supply.
Operation of the microprocessor and the surrounding
circuits will be tested according to the schedule
shown in Table 7. After powering on, signal outputs
change from Step 1 to Step 4 according to the table,
with Steps 1-3 lasting 5 seconds each. Afterwards,
Step 4 outputs will be maintained continuously until
the power is shut off.
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langissaiB
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09R420 552821821
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lortnocrepmaD
langis 06R61HL(5etoN)H
noitcnuflaM16R71HL(6etoN)H
kramhcneBsutatslawener 29R62 HLHH
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
The following peripheral circuits are suggested when
using the FIC03272 with the TGS4161 sensor.
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)
and Figure 4 (Page 8) respectively. Please note the
following items:
a) +5.0V should be applied to Pin No. 6 for the heater
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
Thermistor
signal (VT)
FIC03272
Heater
voltage
(VH)
Sensor
voltage
(EMF)
Buffer
circuit
4.5 times
amplification
circuit
+3.8V +5V
Regulation
circuit
Bias signal (PWM signal)
Convert to DC Buffer
circuit
+10 times
amplification
circuit +
Figure 3 - Block diagram for driving sensor and processing sensor signal
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
10µ
5
67
3
2
4
2
3876
410
98
104
100k
1m
+3. 8V
+4 .4V
LM324N
LM324N
+5V
SENSOR
1
TH
Figure 4 - Circuit for driving sensor and processing sensor signal
AIN1 (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
(100MΩ 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 AIN0 (Pin No. 7)
after being adjusted by a regulator (differential
circuit) with a bias signal.
14
28
6
220µ
1SS176
220µ
6. 2V
1SS176
2. 2k
104103
+4.4V
+5V
FIC03272
VDD
VAREF
VSS
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 (VAREF)
is set at +3.8V. Voltage is provided downstream from
another diode.
Figure 5 - Power supply circuit
Revised 06/04 9
TECHNICAL INFORMATION FOR FIC03272
Analog output (0~3V)
for CO
2
concentration
R91
FIC03272
1M
10k
10µLM324N 6.2V
100
1M
22k
1
2
3
25
5-3 System reset circuit
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.
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
voltage, etc. The microprocessor’s program some-
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.
5-4 CO2 concentration signal circuit
Port 91 (Pin No. 25) outputs a PWM signal which
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
DC. A delay of several seconds is anticipated in the
DC voltage concentration signal because a C-R
combination is used in the circuit. A 100Ω resistor is
connected in series to protect the external circuit from
excessive current.
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)
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
excessive current.
Figure 6 - Reset circuit
Figure 7 - CO2 concentration signal circuit
1k
3.9k 4. 7 k 103
2SA1015Y
104
14
28
3
+4.4V
FIC03272
V
DD
V
SS
RESET
16
10k 6. 2V
100
2SA1015Y
1k
10k
FIC03272
Damper control signal
R60
Figure 8 - Damper control circuit
Revised 06/04 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. 19MGW
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
Revised 06/04 11
TECHNICAL INFORMATION FOR FIC03272
Figure 12 - Application circuit
5
104
C12
12
13
11
IC2 4/4
14
4
C7
1µ
R45
100k
IC2 2/4
7
6
5
2
3
ZD3
6.2V
R23 100
IC2 1/4
LM324N
R26 1M
C6
10µ
R20
10k ZD2
6.2V
R21 100
R43 10k
R44 1k
R28
22k
R27
47k
R24(4/8)
10k
R22 1M
C15
104
C8
103
R24(4/8)
10k
R35
8.2k
TH
C9
100p
R37
30k VR1
30k
C10
10µ
R39
22k
R40 220k
C11 104
IC2 3/4
10
98
TLC271CP
IC1
3
24
87
6
1
LED1
LED2
R18 470
R19 750
R24(8/8)
10k
R24(2/8) 10k
R24(1/8)
10k
R9
1k
R10
4.3k
R11
10k
R12
24k
R13
100k
R14
10k
R8
R5 R7
R6
10k
~
4C5
103
D2 1SS176
R4
2.2k
D1
1SS176
C14
104 C13
104 C1
220µ
ZD1
6.2V C2
220µR2
4.7k R3
4.7k
R1
1k
2SA1015Y
Q1
C3
103
C4
104
X1
CST4.19MGW
21
FIC03272
(IC4 TMP47P443VN)
14
3
28
6
13
12
11
10
9
5
4
26
17
27
18
19
22
21
20
7
8
24
25
23
16
15
JP1 JP2 JP3 JP4
JP5
JP6
JP7
JP8
SW1
SKHHAJ
R15 10k
R16 10k
5V
0V
CN1
B2B-XH-A
1
2
R50 10k
R25
1M
2SA1015Y
Q2
1
2
30V
CN2
B3B-XH-A
R36
10k
104
C12
12
13
11
IC2 4/4
14
4
C7
1
R45
100k
IC2 2/4
7
6
5
2
3
ZD3
6.2V
R23 100
IC2 1/4
LM324N
R26 1M
C6
10
R20
10k ZD2
6.2V
R21 100
R43 10k
R44 1k
R28
22k
R27
47k
R24(4/8)
10k
R22 1M
C15
104
C8
103
R24(4/8)
10k
R35
8.2k
SENSOR
C9
100p
R37
30k VR1
30k
2
1
43
C10
10
R39
22k
R40 220k
C11 104
IC2 3/4
10
98
TLC271CP
IC1
3
24
87
6
1
LED1
LED2
R18 470
R19 750
R24(8/8)
10k
R24(2/8) 10k
R24(1/8)
10k
R9
1k
R10
4.3k
R11
10k
R12
24k
R13
100k
R14
10k
R8
R5 R7
R6
10k
~
4C5
103
D2 1SS176
R4
2.2k
D1
1SS176
C14
104 C13
104 C1
220
ZD1
6.2V C2
220 R2
4.7k R3
4.7k
R1
1k
2SA1015Y
Q1
C3
103
C4
104
X1
CST4.19MGW
21
FIC
14
3
28
6
13
12
11
10
9
5
4
26
17
27
18
19
22
21
20
7
8
24
25
23
16
15
JP1 JP2 JP3 JP4
JP5
JP6
JP7
JP8
SW1
SKHHAJ
R15 10k
R16 10k
5V
0V
CN1
B2B-XH-A
1
2
R50 10k
R25
1M
2SA1015Y
Q2
1
2
30V
CN2
B3B-XH-A
R36
10k
Sensor pins 1,4 : heater
" " 2,3 : sensor
Revised 06/04 12
TECHNICAL INFORMATION FOR FIC03272
6. Hardware Specifications
6-1 Features
*4-bit single chip microcomputer
*Instruction execution time: 1.0µs (at 8MHz)
*Low voltage operation: 2.2V (at 4.2MHz)
*Basic instructions: 92
- 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)
- All sources each have independent latches, and
multiple interrupt control is available
*I/O port (23 pins)
*Two 12-bit Timer/Counters
- Timer, event counter, and pulse width measure-
ment mode
*Interval Timer
*Emulation pod: BM47C443
retemaraP lobmyS sniP snoitidnoC .niM .pyT .xaM tinU
siseretsyH egatlov VSH tupnisiseretsyH--7.0-V
tupnI
tnerruc
I
1NI DLOH,TESER V
DD V,V5.5=NI V0/V5.5=--±2µA
I
2NI stropniardnepO
tupnI
ecnatsiser
R
NI TESER-001022054kΩ
tuptuO
egakael
tnerruc I
OL niardnepOstroptuptuo V
DD V,V5.5= TUO V5.5=--2µA
woltuptuO
egatlovV
LO stroP
9R,8R,7R,4R
V
DDI,V5.4=LOAm6.1=--4.0
V
V
DDI,V2.2=LO02=µA- - 1.0
woltuptuO
tnerruc I
LO 6R,5RstroPVDDV,V5.4=LOV0.1=702- Am
ylppuS
tnerruc
LAMRON(
gnitarepo
)edom
I
DD -
V
DD zHM4=cf,V5.5=-24
Am
V
DDzHM4=cf,V0.3=-12
V
DD zHk004=cf,V0.3=-5.01
ylppuS
tnerruc
DLOH(
gnitarepo
)edom
I
HDD -VDDV5.5=-5.001µA
*8-bit successive approximate type A/D converter
with sample and hold
- 8 analog inputs
- Conversion time: 24µs (at 8MHz)
*Serial Interface with 8-bit buffer
- Simultaneous transmission and reception
capability
- 8/4-bit transfer, external/internal clock, and
leading/trailing edge shift mode
*Zero-cross detector (and external interrupt handler)
*Pulse output
- Buzzer drive/Remocon carrier
*High current outputs
- LED direct drive capacity: typ. 20mA x 8 bits
(Ports R5, R6)
*Reset function
- Watchdog timer reset
*Hold function
- Battery/Capacitor back-up
6-2 DC characteristics (see Table 8)
Table 8 - DC characteristics
(Vss = 0, Topr = -30~+70˚C)
Revised 06/04 13
TECHNICAL INFORMATION FOR FIC03272
6-3 A/D conversion characteristics (Table 9)
retemaraP lobmyS snoitidnoC .niM .pyT .xaM tinU
egatlovecnerefergolanAV
FERA
)noitpoksaM(V
DD
5.1--V
DD
V
ecnerefergolanA egnaregatlov ∆V
FERA
V
FERA
ssV-7.2--V
egatlovtupnigolanAV
NIA
-ssV-V
DD
V
tnerrucylppusgolanAI
FER
--5.00.1Am
rorreytiraenilnoN
-V
DD
V5.5~7.2=
V
FERA
V=
DD
±V100.0
V000.0=ssV
--±1
BSL
rorretnioporeZ--±1
rorreelacslluF--±1
rorrelatoT--±2
Table 9 - A/D conversion characteristics
(Topr = -30~+70˚C)
6-4 AC characteristics (Table 10)
retemaraP lobmyS noitidnoC .niM .pyT .xaM tinU
emiTelcyCnoitcurtsnI
t
yc
V
DD
V5.5~7.2=0.1
-02µs
V
DD
V5.5~2.2=9.1
noitallicsoCRni2.3
htdiweslupkcolclevelhgiH
t
HCW
lanretxeroF
kcolc
X(
NI
)tupni
V
DD
≥V7.206
--sn
V
DD
V7.2<021
htdiweslupkcolclevelwoL
t
LCW
V
DD
≥V7.206
V
DD
V7.2<021
emiTnoisrevnoCD/A
t
CDA
--
42
t
yc
-
µs
emiTgnilpmaSD/A
t
NIA
--
2
t
yc
-
emiTdloHatadtfihS
t
HDS
-
5.0
t
yc
003-
--sn
Table 9 - A/D conversion characteristics
(Vss = 0, Topr = -30~+70˚C)
Revised 06/04 14
TECHNICAL INFORMATION FOR FIC03272
28
114
15
1.778
0.46±0.1
25.6 ± 0.2
26.1 Max.
1.0±0.1 0.18
8.8±0.2
0.3 Min.
3.3±0.2
3.8±0.3
3.0±0.3
0.25
+0.1
-0.05
0-15˚
1.243 Typ
M
10.16
6-5 Dimensions
Dimensions of FIC03272 are shown in Figure 13.
Figure 13 - Dimensions of FIC03272
Figaro Engineering Inc. (Figaro) reserves the right to
make changes without notice to any products herein
to improve reliability, functioning or design.
Information contained in this document is believed
to be reliable. However, Figaro does not assume any
liability arising out of the application or use of any
product or circuit described herein; neither does it
FIGARO GROUP
HEAD OFFICE
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
OVERSEAS
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
convey any license under its patent rights, nor the
rights of others.
Figaro's products are not authorized for use as critical
components in life support applications wherein a
failure or malfunction of the products may result in
injury or threat to life.
