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BQ40Z80: RT1 Pulses Clarification

Antonio Fadhel
Genius 9410 points
Part Number: BQ40Z80

Hi Team,

Can you please assist with the questions below from my customer?:

In sleep while monitoring RT1, I noticed that there is a double pulse 28ms from leading edge apart, twice and then a single pulse, where the leading edge of each of the first pulse is Sleep:Voltage Time. For my test Voltage Time is set to 1s. The pulse width of each pulse is 10ms. What is the purpose of the second pulse? Will this affect quiescent current in sleep if it is waking up twice, two out of every three times it wakes up? While the IC is awake, the pulse is single with a width of 18ms (Which correlates to the time between the falling edge of the first pulse and the leading edge of the second pulse while in sleep), with 750ms between rising edges (1.333Hz). 

Thanks,

Antonio

  • 0
    TI__Mastermind 42535 points
    Hi Antonio,

    In sleep you will have 2 measurements, one each for current at sleep current time and theother for sleep voltage time. Changing those two in fw will result in increased power consumption if the frequency is increased. When the gauge is awake these are taken every second.
  • 0 in reply to Batt
    TI__Genius 9410 points

    Hi Vivek,

    Please see customer feedback below. Can you please verify?:

    That’s not what I am seeing. While awake, it takes a reading every 750ms, not every second. Changing current time has no effect on my pulses as previously described. Setting current time equal to voltage time, I would expect to get a singular pulse, I still get the double pulse twice then a single pulse. If I change voltage time, the space between pulses trains is still voltage time. I believe there is an issue with current time if it is supposed to affect the time between pulses. Can they verify on the EVM? 

    Current Time, Voltage Time Set to 1s

    RT1 While Awake, 750ms between pulses

    RT1 While In Sleep. Double, Double, Single Pulse repeated. Only Changing Voltage Time effects

    Time between pulse trains.

    RT1 Double Pulse

    Thanks,

    Antonio

  • 0 in reply to Antonio Fadhel
    TI__Mastermind 42535 points
    Thanks for the pics Antonio. I'll check with systems and reply back here.
  • 0 in reply to Batt
    TI__Mastermind 42535 points
    Antonio,

    Can you please send me the gg for this? We suspect a config issue.
  • 0 in reply to Batt
    TI__Mastermind 42535 points
    Antonio,

    This is a config issue. They have set Pin config to 00 for MFP12sel 0,1 and MFP13sel 0,1. This means that one of the two pins is not configured to be a temp sensor. In normal mode every 250ms there thermistors are read twice. Now, even if one of them is skipped the fw is not coded to use that cycle separately then the timing alternates. Effectively this means all thermistors will alternate between a 750ms or a 500ms gap in reads.

    However, if we need to recapture the lost cpu cycle for something, we may change this behavior. It is harmless and doesn't change the power proflie of the device.