This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ34Z100-G1: impact of an external temperature sensor (thermistor) on overall power consumption

Part Number: BQ34Z100-G1

Hi,

I'd like to know the impact of an external temperature sensor on the overall power consumption but I could'nt find detailed information on this subject in the datasheet.


So here are my questions:
Q1: assuming we have a 103AT type thermistor connected between REGN25 and P6/TS, what is the current drawn in the network divider (or what is the value of the internal pull-down resistor)?
Q2: is REG25 always active regardless of operationg mode (normal, sleep, fullsleep)?
Q3: is the resistor divider active as soon as a thermistor is connected? regardless of operationg mode or internal/external temp sensor selection?
Q4: According to the datasheet, the BQ34Z100-G1 is supposed to consume :
    – NORMAL operation: < 145-μA average
    – SLEEP: < 84-μA average
    – FULL SLEEP: < 30-μA average
    does these values take into account power consumed by an external thermistor?
    
Regards,
 Bruno

  • Hello Bruno,

    The current consumption will be very minimal for using the external temperature sense, we only do very short measurements just long enough for the ADC to take a sample. It is not biased all the time.

    REG25 will be active in all the modes, FULLSLEEP disables the HF oscillator. SLEEP just reduces the sample frequency.

    The current ratings are average nominal values, it may be slightly more or less depending on your configuration, and the peak current draws will be much higher than the average current.

    Sincerely,

    Wyatt Keller