• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 229 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TWL4030_BCI_BATTERY support configuration required.

Vishal Kumar80159
Prodigy 100 points
Other Parts Discussed in Thread: TPS65950, DM3730

Hello,

RTC losing current time and date on power off the board. I checked with the tps65950 data manual and found that there is a BCI BACKUP configuration available to provide backup power to the RTC. But I am not able to configure it, and RTC loses current time and data with power off.

I checked with the suggestions at the link - http://e2e.ti.com/support/power_management/pmu/f/43/t/92666.aspx also but no luck.

I am using omap3evm DM3730 board with Android GingerBread. 

Is there any option which I am missing to enable Backup Battery support. Kindly help me.

 

Regards,

Vishal.

  • 0
    TI__Genius 15100 points

    Backup supply is possible in two ways:

    1. When you only have the main battery in the sustem then you can have backup domain supply if the battery is connected though the device is in waiton state. Battery has to be greater than 2.1V to maintain backup.

    2. You can have a separate supply/coin cell for backup connected to BKBAT pin.

    Please let me know your hardware based on the above suggestion.

     

  • 0 in reply to Gandhar Dighe
    Prodigy 100 points

    Hi Gandhar,

    Currently we dont have any backup battery on our development board, instead we are using external power supply.

    But we have a separate coin cell for backup which is connected to BKBAT pin and that coin cell is greater than 2.1V. 

  • 0 in reply to Gandhar Dighe
    Prodigy 100 points

    I checked for the driver code of BCI battery to enable the backup support, but I haven't found any twl4030_bci driver in the source tree.

    I am not sure if bci driver is inbuilt with twl-core, if not then where I can found the driver for twl4030_bci.

    kindly help me.

     

    Regards,

    Vishal.

  • 0 in reply to Gandhar Dighe
    Prodigy 100 points

    Hello Gandhar,

     

    Sorry to bother you again.

    As I already mentioned in my previous post that there is no Main Battery connected to our development board instead we are using external 5V adapter to power up the board.

    when I proper shutdoun the system and power cable is still connected, then RTC does not loose date/time on system restart. But if I remove the power cable from the board, then RTC lose its values and date/time resets to it default value (1 Jan 2011, 00:00) on powerup.

    Does it need any special configuration to activate backup state of tps65950.

     

    Regards,

    Vishal.

  • 0 in reply to Vishal Kumar80159
    TI__Genius 15100 points

    Hi,

    You dont need to enable backup. You only need to enable charging in case the coin cell is rechargeable.

    Please check if BKBAT is stable when you remove the main supply. For any reasons if there is a glitch for a short period then the RTC will lose data.