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Table 4 - Termination - I/O Options Dedicated to the CRIR M1 (continued)
PIN NUMBER
PIN FUNCTION DESCRIPTION
5
8
PWM 1 kHz
9
1 The specified parameter relies on the subcontractor's specification and is not tested by Honeywell.
With the ABC function on, the sensor readings, which may have drifted, due to mishandling during
transportation and/or installation, may gradually be recalibrated to the correct numbers. However, in
case the user cannot wait for several cycles of ABC to run, the two quick manual calibrations described
below may be performed.
CAL_in Pin Calibration
Two CAL_in Pin calibration types are offered:
• bCAL (background calibration): Requires the sensor to be exposed to fresh air (400 ppm CO
• CAL (zero calibration): Requires the sensor cell to be completely immersed in a CO
atmosphere.
A switch input is defined for the operator or master system to select one of the two prepared
calibration codes shown in Table 5. It is recommended that the sensor be exposed to the
targeted gas atmosphere for at least 10 minutes to ensure the CO
chamber is stable at the argeted value.
Tel: 07788 548013
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Honeywell CRIR-M1 User Guide
From sensor's voltage regulator, output
may be used to logical level converter
if master processor runs at 5 V supply
voltage
DVCC_out
Series resistance
Nominal voltage
Allowed source current
Voltage precision
Open collector output for alarm indication
Absolute maximum voltage range
Alarm_OC
Internal pull up to G+ resistor
Maximum sink current
Saturation voltage
PWM output configured as digital output
used for direct reading by customer's
microcontroller or toprovide analog output
Duty cycle minimum
Duty cycle maximum
PWM resolution
PWM period
Absolute maximum voltage range
Internal pull down to GND resistor
Output low level
Output high level
CALIBRATION
1
1
1
1
1
1
1
2
ELECTRONIC SPECIFICATION
Induced noise or excessive current drawn
may affect sensor performance; external
series resistor is strongly recommended if
this pin is used
No internal protection
3.3 ± 0.1 VDC
6 mA maximum
±0.75% is typical, ±3% is maximum
No internal protection, pulled up to G+ at
processor reset (power up and power down)
GND to 5 V + 0.5 V
10 k
100 mA
2.3 V to Vin + 0.3 V
No internal protection, pulled down at
processor reset (power up and power
down)
0%, output low
100%, output high
0.5 us ± 4%
1 ms ± 4%
GND to DVCC_out + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
free
2
concentration inside the sensor
).
2
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