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  • Forum Post: TPS65950 TPS65930 TPS65920: Board bring up or wake up problems

    Gandhar Dighe
    The following are very common board wake up problems - 1. The board layout for input switchers may cause problems and not allow the board to power-up. If the traces at the input cannot handle the required current then the device will fail to power up. 2. If the 32KHz crystal load capacitance is not...
    on Jan 22, 2009

  • Forum Post: Internal capacitor range for 32-kHz oscillator

    Antony Lin
    In our DataManual, for 32-kHz oscillator we defines that "Internal capacitor on each input (Cint)" is typically @ 10pF. What's the MIN & MAX value of this parameter? Thanks, Antony
    on Sep 21, 2009

  • Forum Post: Re: TPS65920 32kHz External Clock Connections

    Gandhar Dighe
    Hi Charles, The description is incorrect here. 32KXOUT cannot be used as a clock output. The main reason for the DC is in case the applied sine wave at the 32KXIN pin doesn't have a full swing of 1.8Vp-p. if you see the two figures the you will notice that on 11-7 there is no mention of Vp...
    on Jan 21, 2010

  • Forum Post: Re: [TWL] 32KHz jitter value of low/high jitter mode

    Gandhar Dighe
    Hi Logan, It is best to keep the default setting. This bit probably was provided for some test purposes and hence there is a test key for this. I dont have the low and high jitter values with me. Why would you/customer need the values for jitter? Regards, Gandhar.
    on Jul 26, 2010

  • Forum Post: Re: 32KHz clock

    Gandhar Dighe
    Hi, That is the approximate start-up time. For an external oscillator you will need 1.8V. Please see the details in the data manual. Yes, 32K has to be running and stable before you can see the DCDC's powered up. Regards, Gandhar.
    on Sep 14, 2010

  • Forum Post: Re: [TPS65920] Backup mode current consumption @ BKBAT

    Gandhar Dighe
    Hi Antony, Your reading are all correct. In low power mode the clock drift is normal. The 32K clk is active in this mode. When the setting is in normal mode then you will see an approximate increase of 4uA. This is what you are seeing. Unfortunately your customer will have to pick one of two...
    on Oct 20, 2010

  • Forum Post: Re: 32KHz clock

    Gandhar Dighe
    Hi, There is a delay in stabilizing the 32K even if you are using an external signal. The internal oscillator cannot be bypassed and hence you see the delay. With an external 32K the delay will be lesser than with using a crystal. The VIO step you see would be due to the leakage on the internal...
    on Mar 4, 2011

  • Forum Post: TPS65920 duty cycle problem on 32k clock

    Philippe MAIRE
    Hi, On my OMAP board, the 32,768 Hz clock is a square clock provided by an external RTC. The duty cycle of the clock is at about 40%, and I just noticed there is a requirement of 45/55% in the SWCS037E datasheet. The OMAP on its side does not require a particular duty cycle on this clock. ...
    on Apr 8, 2011

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