Revised 10/12
4
TECHNICAL INFORMATION FOR CDM4160
is pushed during warm-up time (within the first two
hours after the module is powered on), the baseline
voltage is read at that moment and the module
immediately goes into operation mode.
Caution:
If the baseline reset switch is pushed while
in a polluted environment where the actual CO
2
concentration is higher than 400 ppm (ambient
levels), the accuracy of readings may become
adversely affected.
2-7 Input-output signal (CN1)
Please refer to Table 4-Rated input and output voltages
for rated values. Also please refer to Fig. 2-Circuit
diagram of interface
for circuit.
2-7-1 Vin (Pin No. 1)
Regulated voltage should be input into this port. The
sensor’s output may vary according to the sensor’s
voltage dependency characteristics if the input
voltage fluctuates. Please refer to "TGS4160 Technical
Information"
for details.
2-7-2 Concentration output (Pin No. 2)
An analog voltage corresponding to CO
2
concentration
is output from this port according to the following
equation:
CDM4160-L00 : Vconc=CO
2
conc/1000
CDM4160-M00 : Vconc=CO
2
conc/2000
CDM4160-H00 : Vconc=CO
2
conc/10000
2-7-3 Control signal output (Pin No. 3)
When CO
2
concentrations exceed the control
concentration, output from this port will be “ON”.
Table 4 - Rated input/output voltages
Table 3 - CDM4160 jumper pin settings
2-7-4 Trouble signal output (Pin No. 4)
This port will output “ON” in the following
situations:
* when sensor output is abnormal
* when the connection for control concentration
setting is broken
2-8 LEDs (refer to Table 5)
2-8-1 Green LED (LED 1)
The green LED indicates the module’s power
condition. It will be lit when the power is on. The
LED blinks on and off during warm-up time (for the
first two hours after power is turned on).
2-8-2 Yellow LED (LED 2)
The yellow LED indicates a trouble condition. It blinks
on and off when trouble signal output is “ON”.
2-8-3 Red LED (LED 3)
The red LED indicates that CO
2
concentration is over
the control concentration level. It lights when control
signal output is “ON”.
Pin
No.
Item
Minimum
Typical
Maximum
u/m
1
Power supply input (V
IN
)
3.5
5.0
5.5
V
2
CO
2
conc.
output
(V
CONC
)
Output voltage
GND
-
4.6
V
3
Control signal
output
(CTRL)
Output voltage
(trouble)
I
OL
=1mA
GND
-
0.2
V
Output voltage
(warm-up) I
OH
=1mA
V
IN
-0.6
-
V
IN
V
Allowable current
-
-
25
mA
4
Trouble signal
output
(TRBL)
Output voltage
I
C
=5mA
-
-
0.3
V
Allowable voltage
-
-
50
V
Allowable current
-
-
100
mA
Mode
JP1
JP2
Threshold CO
2
Concentration of Control Signal
CDM4160-L00
CDM4160-M00
CDM4160-H00
ON
OFF
ON
OF
ON
OFF
I
OPEN
OPEN
800ppm
720ppm
1,000ppm
900ppm
5,000ppm
4,500ppm
II
OPEN
SHORT
1,000ppm
900ppm
2,000ppm
1,800ppm
10,000ppm
9,000ppm
III
SHORT
OPEN
1,500ppm 1,350ppm
5,000ppm
4,500ppm
20,000ppm
20,000ppm
IV
SHORT
SHORT
2,000ppm 1,800ppm
8,000ppm
7,200ppm
40,000ppm
36,000ppm
