I am designing a circuit using Multi gas sensing platform using SAMD21(programmed in Arduino language).The data will be uploaded to a MQTT server using ESP8266.The circuit should run without any human intervention.As an extra layer of security,i want a supervisory circuit so that if any hang/stall occurs,the circuit should power reset itself.
For that purpose,i have chosen MAX6749 & MIC2042 for the power reset circuit.The SAMD21,Sensors & the ESP8266 will be powered via the MIC2042.MIC2042 & MAX2749 will be powered directly.The MIC2042 enable pin will be connected to MAX6749 reset pin.The MAX6749 will receive pulses from the MCU in some regular interval.If any hang/stall occurs,the SAMD21 will not give output pulse to the MAX6749 & it will reset the MIC2042 & thus the whole circuit.
My query is,i want a pulse interval of 30s.Is it possible with MAX6749 because as far as i can understand in the datasheet:
In extended mode (Figure 4b), the watchdog timeout period is multiplied by 128. For example, in extended mode, a 0.1μF capacitor gives a watchdog timeout period of 65s
Has anyone worked with these before?