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TWL6035 RTC Power Draw

Nathan Zuber1
Prodigy 30 points

Can someone tell me what the power draw is for the RTC on the TWL6035?

I am trying to figure out how big of a battery I need to put in if I don't use the recharge feature of the chip.

From what I can seem,  the RTC system consists of a Power source for Vbackup, an RTC LDO, a 32KHz oscialltor and the RTC module itself.

The Q current for all LDOs in off mode is 1uA, but the on mode Q current for the LDOVRTC is not listed.  I could use the values for the other LDOs but they are WAY too high to be practical for battery-powering and RTC.  Furthermore, there is not current draw listed for the RTC.

There is a "ground current" specification for the 32KHz crystal oscillator clock in various modes.

What are the missing current values?

Should I be using the "ground current" specification as the entire RTC system, even though it is just listed as the spec for the 32KHz cyrstal oscillator clock?

I'd love some clarification,

Thanks,

Nathan

  • 0
    TI__Intellectual 1915 points

    Nathan Zuber1 said:

    Can someone tell me what the power draw is for the RTC on the TWL6035?

    I am trying to figure out how big of a battery I need to put in if I don't use the recharge feature of the chip.

    From what I can seem,  the RTC system consists of a Power source for Vbackup, an RTC LDO, a 32KHz oscialltor and the RTC module itself.

    The Q current for all LDOs in off mode is 1uA, but the on mode Q current for the LDOVRTC is not listed.  I could use the values for the other LDOs but they are WAY too high to be practical for battery-powering and RTC.  Furthermore, there is not current draw listed for the RTC.

    There is a "ground current" specification for the 32KHz crystal oscillator clock in various modes.

    What are the missing current values?

    Should I be using the "ground current" specification as the entire RTC system, even though it is just listed as the spec for the 32KHz cyrstal oscillator clock?

    I'd love some clarification,

    Thanks,

    Nathan

    Nathan Zuber1 said:

    Can someone tell me what the power draw is for the RTC on the TWL6035?

    I am trying to figure out how big of a battery I need to put in if I don't use the recharge feature of the chip.

    From what I can seem,  the RTC system consists of a Power source for Vbackup, an RTC LDO, a 32KHz oscialltor and the RTC module itself.

    The Q current for all LDOs in off mode is 1uA, but the on mode Q current for the LDOVRTC is not listed.  I could use the values for the other LDOs but they are WAY too high to be practical for battery-powering and RTC.  Furthermore, there is not current draw listed for the RTC.

    There is a "ground current" specification for the 32KHz crystal oscillator clock in various modes.

    What are the missing current values?

    Should I be using the "ground current" specification as the entire RTC system, even though it is just listed as the spec for the 32KHz cyrstal oscillator clock?

    I'd love some clarification,

    Thanks,

    Nathan

    Nathan, VRTC power consumption is linked to VSYS; please refer to table 3.5.12 of data manual; 32KHz crystal oscillator is as well included into VSYS power consumption.

    Best regards, Alain.