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Found 1 result

  1. NurseBob

    Power Management - UART

    I was reading the Family guide, as well as the F5529 guide and could not really determine how power consumption is affected by the UART in Asynch mode. I expect that baud will certainly play a role, as the core voltage must be increased to run at higher frequencies. The thought behind all of this is driven by wanting to keep battery life at a maximum, of course... My GPS/Iridium Satellite comm device is following this basic flow: loop() switch(currentState) case ENABLE_GPS: { Serial1.begin(9600); digitalWrite(GPS_SleepPin, HIGH); //enable the GPS currentState = WAIT_FOR_GPS_FIX; break; } case WAIT_FOR_GPS_FIX: { if(bGPS_sentences_valid) { currentState = DISABLE_GPS; } break; } case DISABLE_GPS: { Serial1.end(); digitalWrite(GPS_SleepPin, LOW); //disable the GPS currentState = SLEEP; break; } case SLEEP: { sleepSecond(3600); //wait an hour for next fix currentState = ENABLE_GPS break; } default: break; } Is there a power-saving benefit to stopping and starting the UART? I would assume so, but am aware that the UART code has a built-in sleep() as well. As an aside: I was seeing all kinds of weird behavior when trying to use the enable pin on the GPS, an MT3339. I finally tracked it down to the fact that when the P6_5 pin went LOW, the Enable pin on hte MT3339 drew 350uA... a 10K resistor has resolved that problem, but the ee noob that I am, it took me some time to find the problem. Whle the boards that arrived on Saturday don't have a resistor in the circuit, in the future I'll probably add both a mosfet for the pin to drive, AND a resistor to limit the loss of precious electrons...
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