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Table 4 - Termination - I/O Options Dedicated to the CRIR M1
PIN NUMBER
PIN FUNCTION DESCRIPTION
6
7
2
UART_R/T
3
UART_TxD
4
UART_RxD
1
1 The specified parameter relies on the subcontractor's specification and is not tested by Honeywell.
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Honeywell CRIR-M1 User Guide
Power supply plus terminal
Vin
Operation voltage range
Power supply minus terminal
GND
Sensor's reference (ground) terminal
Direction control line for half duplex,
RS485 transceiver like MAX 485
configured as digital output
Absolute max voltage range
Internal pull down to GND resistor
Output low level
Output high level
UART data transmission line configured as
digital output
Absolute maximum voltage range
Internal pull up to DVCC_out resistor
Output low level
Output high level
UART data receive line configured as
digital output
Absolute maximum voltage range
Internal pull up to DVCC_out resistor
Input low level
Input high level
Digital input forcing background or zero
calibration
Background calibration: When closed
for minimum 4 s, maximum 8 s, bCAL
(background calibration) assuming 400
ppm CO
exposure
2
bCAL_in
Zero calibration: When closed for
/CAL
minimum 16 sCAL (zero calibration)
assuming 0 ppm CO
Absolute maximum voltage range
Internal pull up to GND resistor
Input low level
Input high level
TERMINATION
Power Pins
Communication Pins
1
1
1
1
1
1
1
1
1
Input/Output Pins
exposure
2
1
1
1
ELECTRONIC SPECIFICATION
Unprotected against reverse connection
4.5 to 5.5 V
-
-
No internal protection, pulled down at
processor reset (power up and power
down)
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
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
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
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
GND to DVCC_out + 0.5 V
120 k
GND to 0.75 V
2.3 V to DVCC_out + 0.3 V
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
GND to DVCC_out + 0.5 V
120 k
GND to 0.75 V
2.3 V to DVCC_out + 0.3 V
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