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backup battery
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  • Forum Post: Re: Confusing Documentation Regarding Backup State for RTC in TPS65920

    Gandhar Dighe
    Hi, Sorry for the confusion in the documents. Information in SWCA025 is correct. The information in SWCU052A will be corrected. In TPS65930/20 the battery charging capability was removed and in the documentation everything related to charging was taken away including the back-up battery. However...
    on Mar 30, 2009

  • Forum Post: TPS65950/30/20: Backup battery

    Gandhar Dighe
    Customer question: Q: Can we consider that connecting a back-up battery will keep the PMIC RTC powered even if the main battery is unconnected? A: Yes, please refer to the state diagram in the Resets and Power Management chapter in the TRM.
    on Apr 30, 2009

  • Forum Post: TPS65950 32KCLKOUT Mode During "Battery Backup"

    John Schaefer
    Hello, Is the TPS65950 32KCLKOUT output enabled when the TPS65950 is in the "battery backup" mode (i.e., when the power source for the TPS65950 is the battery)? Regards, John D. Schaefer
    on Jul 9, 2009

  • Forum Post: Re: TPS65930 question

    Gandhar Dighe
    Hi, The TRM is missing some information for backup battery. You can refer to the TRM section for TPS65950 for backup battery. I am in the process of correcting the TRM and will make the changes. The four voltages you specified are for end-of-charge for the backup battery. For backup battery to...
    on Sep 30, 2009

  • Forum Post: Prescaler of backup battery for MADC

    Antony Lin
    How to enable the resistive divider on backup battery for MADC (ADCIN9)? I can't find it in TRM, and can read the correct value from GPCH9_MSB & GPCH9_LSB . Thanks! Antony
    on Nov 27, 2009

  • Forum Post: Re: Backup battery charging

    Gandhar Dighe
    Antony, You are right. BB_CFG value will reset. Only those registers retain value which are mentioned as (backup domain). BB_CFG is not part of this. Regards, Gandhar.
    on Jan 14, 2010

  • Forum Post: Re: About TPS65930 BKBAT pin

    Gandhar Dighe
    Hi, BKBAT is available in all devices in the family - TPS659xx Regards, Gandhar.
    on Jan 28, 2010

  • Forum Post: Re: TPS65930 RTC backup mode is not working when VBAT is removed.

    Gandhar Dighe
    Hi, This should not happen. Have you tried checking STOP_ON in RTC_CTRL_REG. If the RTC is ON this should be '1'. BACKUP should also be '1' as you have 2.5V on that pin. Does the backup voltage go low for a short period? You may want to continuously probe it when you remove VBAT...
    on Mar 5, 2010

  • Forum Post: [TPS65950] Absolute MAX voltage on BKBAT

    Antony Lin
    What is the absolute MAX voltage on BKBAT ? Is there concern if backup battery upto 3.6V connected to BKBAT? Thanks, Antony
    on Aug 2, 2010

  • Forum Post: Re: TPS65930 backup battery charging

    Gandhar Dighe
    Hi John, I can confirm that the backup battery charging is done by setting the BBCHEN bit. However, on the software side I dont know how this is done. From your comments it looks like you searched thru the code and found this driver. If that is the only place where you find then yes, that is the only...
    on Mar 2, 2011

  • Forum Post: TPS65950: BKBAT - wrong polarity

    Daniel Schurr
    Hi, in the datasheet of the TPS65950, the recommended operating maximum ratings of "BKBAT" are min 1,8V and max 3,3V. If a user insert the backup-battery wrong, the voltage at BKBAT is -3,0V. Will this negative voltage destroy the IC or is a protection circuit inside? (In my schematic a...
    on Mar 10, 2011

  • Forum Post: Abs Max rating for BKBAT

    Alberto Pierotti
    We are designing a system that has a fairly hefty backbup battery, 500 mAH Li-ion. This system has its own power management circuitry, and we plan to control the power to the module which contains an OMAP3530 and a TPS65930 with our own power mosfet. When main power is removed, we plan to keep...
    on Jan 13, 2012

  • Forum Post: TPS65921 RTC battery backup capability

    Jeff Mogensen
    I have connected a battery to ball G9 BKBAT VBACKUP and have maintained the RTC after removing power main power VBAT. The documentation on the TPS65921 states that ball G9 BKBAT VBACKUP must be shorted to GND, yet the documenation also states the VRTC.OUT output voltage range for both "Normal...
    on Apr 5, 2012

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