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RTC
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  • Forum Post: TPS65950/30/20: RTC current

    Gandhar Dighe
    Q: What is current consumption/specification for running the RTC only. A: RTC is supposed to supply only the backup domain and in backup mode this consumption is 2.25uA. This is the value when 32k is in low power mode and device in OFF state.
    on Feb 18, 2009

  • Forum Post: Still Confused By Documentation Discrepancies - TPS65920 RTC - Held Up Awaiting Answer

    Howard Robson
    I posed this follow on question on 3/30/09 in a previous post and am still awaiting and answer. The design is held up awaiting clarification on the question this further documentation discrepancy I am trying to find the current drain of th RTC to determine battery life. The only reference I can find...
    on Apr 6, 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: Accessing RTC registers

    Antony Lin
    I tried to access RTC register but found I failed to change the TC register values. In addition, RTC is not running (all TC registers are '0'.) MSECURE is high on my board. I also set STOP_RTC='1', and check RUN='1', too. Did I miss anything? Thanks, Antony
    on Jul 28, 2009

  • Forum Post: Re: Accessing RTC registers

    Antony Lin
    Hi Kartik, Thanks, it works now. I didn't set get_time.
    on Jul 28, 2009

  • Forum Post: Re: TPS65930 RTC

    Gandhar Dighe
    Hi Rejo, You can refer to the document pointed by Mike. This document explains how 32K clk can be compensated and adjusted using TPS65930 registers. It is possible to adjust accuracy to 1/32768 seconds per hour. However, the external porocessor needs to calculate the value to be programmed in the...
    on Aug 13, 2009

  • Forum Post: Re: Linux driver for TPS65930 RTC

    Gandhar Dighe
    Hi Subash, The RTC does not work with Mistral hardware because MSECURE is not pulled high. MSECURE needs to be pulled up for RTC to work. If you need secure operation then you also need to connect MSECURE from TPS659xx to OMAP DRM_SECURE pin. Both these fixes will need hardware modifictions on the...
    on Aug 18, 2009

  • Forum Post: TWL4030 Compensation techniques

    Gandharva Kumar
    My customer has the following doubt; does anybody know of any other technique to compensate the RTC of TWL4030. The purpose of this mail is to explore the techniques available for compensation of drift in RTC Timing. The conventional approach suggested in http://focus.ti.com/lit/an/swca024/swca024...
    on Oct 12, 2009

  • Forum Post: Re: TPS65930 RTC Time register Access issue

    Gandhar Dighe
    Hi Rejo, Do you set GET_TIME bit every time you try to access the calendar registers? Please refer to thi spost also - http://e2e.ti.com/forums/p/6586/25405.aspx#25405 Regards, Gandhar.
    on Nov 2, 2009

  • Forum Post: Re: TPS65950 - RTC wake up on predefined counter / alarm

    Gandhar Dighe
    Hi Keith, We dont have a document for this. However, here are some steps that customer can follow: Set the time in the RTC time registers - year, month, ....., seconds. Make sure MSECURE is HIGH for this operation. Then, you can set the RTC alarm registers for any specific time, set IT_ALARM='1'...
    on Nov 19, 2009

  • Forum Post: TPS65950 RTC Current

    Graham Woods
    Hi, Can you tell me what the current consumption is for using the RTC function on the TPS65950 please. Ive looked through the datasheet but I cannot seem to find this information. Thanks Graham
    on Mar 22, 2010

  • Forum Post: Re: RTC does not keep time after 2 days on the tPS65930?

    Gandhar Dighe
    Hi Mohsen, Can the customer check or be very sure that backup voltage is at 1.88V at all times. If there is a glitch for a short period when the battery is off then the RTC will have no power and data will be lost. Regards, Gandhar.
    on Jun 24, 2010

  • Forum Post: Re: can a capacitor instead of battery be used on pin VBACKUP for backup purpose?

    Jiansheng Liu
    Thanks for the reply. I checked the datasheet that describes a capacitor in a range of 5 to 2000mF, that is huge! Are we sure it is not a typo of 5 to 2000uF?
    on Nov 10, 2010

  • Forum Post: TPS65950 RTC Battery Backup - Configuration required?

    Josh Watts
    Does the battery backup feature of the TPS65950 require any configuration or setup? Or should it work perfectly well "out of the box"? In our design, we have BKBAT connected to a small lithium coin-cell battery, currently charged at 3.0V. Both sudden loss of power and proper shutdown of...
    on Feb 8, 2011

  • Forum Post: Re: TPS65921 RTC battery backup capability

    Jeff Mogensen
    Alexis, That is interesting since I am able to keep the RTC alive using a 3V coin battery connected to the TPS65921 BKBAT when the main battery has been removed from VBAT. The main battery has been removed for a over a week and time has been maintained. Perhaps VRTC is being supplied via the BKBAT...
    on Apr 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

  • Forum Post: TPS65023 and Backup Coin Cell Battery

    Saad Habayeb
    Hi, I'm using a coin cell battery with the TPS65023 for a real-time chip. the main power to the board is 5V through a AC-DC supply (not a portable device). The microprocessor is a TI AM3505. The problem is that on cold power-up the micro does not start correctly until the reset button (connected...
    on Oct 3, 2012

  • Forum Post: tps6591x rtc WEC7 OALIoCtlHalInitRTC problem

    Thomas Coin
    Hello everyone, I'm trying to use the external RTC on the AM335x EVM (WEC 7), using the TPS6591x, but I've got some troubles initializing it. What does have to be done in the OALIoCtlHalInitRTC function ? How to check at init if the RTC has been rested or if it's running normally ? Regards...
    on Jan 3, 2013

  • Forum Post: can a capacitor instead of battery be used on pin VBACKUP for backup purpose?

    Jiansheng Liu
    I wonder if it is possible to use a capacitor instead of battery connecting to pin TPS65910's VBACKUP for temperary backup purpose? I don't expect it is able to last for ever, but just for a few of minutes. Is it possible? If it is how big a capacitor be considered? There is a capacitor in range...
    on Nov 9, 2010

  • Forum Post: RE: TPS65910Ax Built-in RTC

    Frank O
    Hi, Any updates on this topic since November 2012? As I also consider using the TPS65910A3 RTC with a battery on VBACKUP pin. According to another thread on this forum, the EEPROM Bits are reloaded from a OFF to Active state transition. (http://e2e.ti.com/support/power_management/pmu/f/43/t/225987...
    on Jun 11, 2013

  • Forum Post: TPS65910Ax Built-in RTC

    Daisuke Maeda
    Our customer want to use TPS65910Ax Built-in RTC. RTC is configured by EEPROM Configuration as follows. - Clock gating of RTC register and logic, low-power mode - Clock source is internal RC oscillator TPS65910Ax User's Guide For AM335x Processors (Rev. B) http://www.ti.com/lit/ug/swcu093b...
    on Nov 1, 2012

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