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VBAT
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  • Forum Post: TPS65950: What are VBAT and VBATS pin functions?

    Gandhar Dighe
    A: VBAT is for voltage sensing and VBATS is for current sensing.
    on Mar 18, 2009

  • Forum Post: TPS65950/30/20: VBAT level for power on

    Gandhar Dighe
    FAE question/discussion: Q: If VBAT is higher than 3.2V and in master mode the device will go to active mode as long as PWRON is set to high. Lets assume that 2.8V< VBAT < 3.2V then I would think that if PWRON is toggled from low to high then it goes from waiton to active. A: There are...
    on Apr 2, 2009

  • Forum Post: TPS65950/30/20: VBAT slew rate

    Gandhar Dighe
    Customer question: Q: Is the device sensitive to VBAT slew rate for power-up and should we be worried about any u-v lock out logic? A: No, it is not sensitive to slew rate. It will trigger power-on when VBAT is above the treshold (3.2V +/- 100mV). This threshold is valid when VBAT (battery insertion...
    on Jun 9, 2009

  • Forum Post: TPS659x general questions. BIST, and Low bat.

    Wade VonBergen
    I have a customer asking a few questions. I believe I know the answers, but wanted to confirm. Here are question, and my answers in Blue. If I could get confirmation or additional insight that would be great. Regards, Wade TPS65920: Is it true that if I do an external reset by pulling PWRON...
    on Sep 21, 2009

  • Forum Post: Power Up Problems with TPS65920

    Howard Robson
    I am in the prototype testing phase on a project using OMAP3530CBC and TPS65920. We have 5 prototype boards, and with 2 of them we have problems with the power up sequence of the TPS65920. In these cases we only get VIO powering up - VDD1 and VDD2 never power up. We would like to resolve this problem...
    on Oct 9, 2009

  • Forum Post: Re: Power Up Problems with TPS65920

    Gandhar Dighe
    Hi Howard, Whenever power up problems were seen in the past there were two possible options - 32K oscillations werent correct or the layout did not allow for sufficient current. In your case it doesnt seem to be any of these. I am assuming the trace thickness are sufficient as you have specifically...
    on Oct 9, 2009

  • Forum Post: Re: TPS65930 question

    Gandhar Dighe
    Please refer the following post, it will be helpful: http://e2e.ti.com/forums/p/11073/43115.aspx#43115
    on Oct 26, 2009

  • Forum Post: TPS65920 PWRON or GPIO Voltage Applied with VBAT=0

    Charles McCarthy
    Hello! I have some questoins about applying voltages to signals on the TPS65920 when the VBAT supply is at zero. 1) Is it okay to have the VBAT voltage at zero but still have a voltage applied to the PWRON signal? 2) If it is okay, what would be the voltage limits on the PWRON signal? 3) Will...
    on Feb 16, 2010

  • Forum Post: Re: TPS65950 Keeps Asserting nRESPWRON

    Chris R
    The NAND was empty for the 7ms reset case. The nRESPWRON problem turned out to be that we didn't have a battery in the circuit--the VBAT voltage was drooping and causing the nRESPWRON signal to get asserted. The reason we saw two different behaviors for that case is because the two different boards...
    on Apr 20, 2010

  • Forum Post: Re: TPS65950/30/20: VBAT and PWRON connection guideline

    Gandhar Dighe
    Hi, For slave mode this should not matter because the battery is always connected and PWRON acts as a level trigger to turn ON/OFF the device. Hope this helps. Regards, Gandhar.
    on Jul 16, 2010

  • Forum Post: Re: TPS65950 Battery charging with temperature reading

    Gandhar Dighe
    Hi, Battery temperature reading may show an incorrect value if for some reasons there is a drop in VBAT for some short period of time. There was another customer who had similar problem. All setup and schematic was fine. He debugged it to find that his VBAT dropped for some unknown reasons and...
    on Oct 8, 2010

  • Forum Post: Unused power rails

    Yannick Fortin
    Hi, I am designing a board with TPS65950 and DM3730 . I am only using a limited set of features so I am leaving a whole bunch of pins unconnected. The TPS65950 has several internal LDO regulators. Generally speaking it seems like we have to put a 1uF capacitor at the INPUT and OUTPUT of every LDO...
    on Feb 11, 2011

  • Forum Post: TPS659XX prevent power up on VBAT

    Cliff Brake
    Hello, I am interested if there is any way to prevent a TPS659XX system from powering up until the power button is pressed? We have a situation where a charger wants to trickle charge a dead battery and if we try to power up during this state, the charger things the battery cells are shorted. It seems...
    on Jun 24, 2011

  • Forum Post: TPS65950 battery current sense?

    Perry Robbins
    It is difficult to accurately predict the current draw of the OMAP and peripherals in our system, they will vary greatly. Since the BCI shares the battery charge current with the system, wouldn't it make sense to run the system from the FET side of the current sense resistor and therefore have accurate...
    on Apr 6, 2010

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