ABC Period: 8 days. The default “tuning speed” is limited to about 30-50ppm/ABC period.
Measurement interval: 4 sec.
Power supply: 4.5 —5.25V unprotected against surges and reverse connection
Power consumption: 300mA peak
4.5 V to 5.25 V DC
|G0||Power supply minus terminal|
Sensor’s reference (ground) terminal
|Alarm_OC||Open Collector output for alarm indication|
|PWM 1 kHz||PWM output. Configured as digital output|
Used for direct reading by customer’s microcontroller or to provide analog output.
|0%, output Low|
100%, output High
|DVCC_out||from sensor’s voltage regulator|
Output may be usedto logical level converter if master processor runs at 5V
|UART_TxD||UART data receive line, digital output|
|UART_RxD||UART data receive line, digital input|
|UART_R/T||Direction control line for half duplex RS485 transceiver like MAX485|
|bCAL_in/ CAL||background calibration, which requires that the sensor is exposed to fresh air 400ppm CO2 (4-8 sec)|
CAL (zero calibration), cell to be completely evacuated from CO2 (>16 sec), closed to G0