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VBUS
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  • Forum Post: TPS65950: Typical system questions

    Gandhar Dighe
    Customer questions. Q: With the completely exhausted battery, our application is expected to work with VBUS, with a shorter charge (say about 10 min) [GD] With completely exhausted battery the device will be OFF. In this state USB charger cannot function. USB charger will be good only in ACTIVE state...
    on May 1, 2009

  • Forum Post: Re: TPS65950 Power Dissipation

    DavidC
    Hi Suresh, Do you have a battery in your system? Iif not, Why do not you use the Charger to regulate the Power for your system. You will save one LDO. Of course, if AUDIO and some other function are not used, you need to re-calculate your max power consumption. Example: VINTANA2 will be close...
    on May 4, 2009

  • Forum Post: TPS65930 Charge Pump/Vbus Enable and Current Source Capability

    Nick Trombly
    What current can the VBUS pin support on the TPS65930? It looks like the charge pump is limited to 450mA, but in other places it mentions 100mA. Also, how do you enable VBUS (or the charge pump)? Is it autodetect?
    on Jul 30, 2009

  • Forum Post: USB - VBUS

    Wade VonBergen
    Based on my understanding, if VBUS is not present, the session will not be started in a peripheral. Can this be overridden via software? Thanks, Wade
    on Aug 28, 2009

  • Forum Post: Re: USB OTG - Charge pump gives 100mA .customer required 500mA

    Gandhar Dighe
    Hi Daniele, In this case the device VBUS pad can be connected to the USB connector so that device comparators can be used to sense the VBUS voltage. Please ensure that the charge pump is off. If the device is set for OTG function then it really doesn't matter who is supplying the 5V as the host...
    on Oct 19, 2009

  • Forum Post: DP DM short detection

    Antony Lin
    What is the programming procedure for short detection between DP & DM? Can it be done without 5V on VBUS? Thanks, Antony
    on Nov 9, 2009

  • Forum Post: Re: DP DM short detection

    Gandhar Dighe
    Hi, You can check the following manual sequence: Step 1 (Set D+ low and check if D- also goes low): Set OTGCTRL=2 (DMPULLDOWN=0|DPPULLDOWN=1) Set FUNC_CTRL=0x41 (SUSPENDM=1|OPMODE=0|TERMSELECT=0|XCVRSELECT=1) Read DM_HI in OTHER_INT_STS Step 2 (Set D+ high and check if D- also goes high): Set OTGCTRL...
    on Nov 9, 2009

  • Forum Post: TPS65950 VBUS comparator issue

    Grazvydas Ignotas
    OTG_EN and WKUPCOMP is set; VUSB3V1, VUSB1V8 and VUSB1V5 regulators enabled; VUSB_DEDICATED1 has SW2VBAT set and SW2VBUS cleared. When I plug USB cable (with PC on other side) I get USB_PRES interrupt and STS_HW_CONDITIONS has STS_VBUS set, as expected. But when I pull the cable out nothing happens...
    on Nov 27, 2009

  • Forum Post: Re: TPS65930 VBUS

    Gandhar Dighe
    Hi Sairam, If there is inconsistency then I am assuming that you have the SW configured correctly and problem may be due to HW. There are three setting in SW that you need - all USB LDOs active, DRVVBUS='1' and HFCLK active. With these settings you should be able to see correct voltage...
    on Dec 22, 2009

  • Forum Post: Re: External Power Supply on USB OTG with TPS65950

    Gandhar Dighe
    Hi, Yes, you can connect it the way you said. The reason for this is, it will be possible for the device and OMAP to detect VBUS. When you have external VBUS, ensure that the internal CP is not turned ON by software. Regards, Gandhar.
    on Mar 10, 2010

  • Forum Post: TPS65930 - VBUS pin

    Amit Benjamin
    I want to know what will happen when the PMUs VBUS charge pumps are off and 5V appears on VBUS pin (5V that is not generated by the PMU)? Will it harm the PMU? Will there be excessive leakage current by the part? Or is there any other reason I should reconsider this topology? My motive is using VBUS...
    on Mar 28, 2010

  • Forum Post: Re: TPS65921 PMIC, USB-OTG Questions

    Jigarsinh Rathod
    Hi Anubhav, The OMAP has to be in communication with PMIC to get the optimum setting of charging current . Based upon the status of the DP, DM and ID pins the type of charger and hence the current capacity of the charger is determined. The OMAP has to initialize enabling the OTG and CARKIT to start...
    on Apr 9, 2010

  • Forum Post: [TPS65920] External PD resistor on VBUS

    Antony Lin
    There's a special situation we need to add external 75kohm resistor on VBUS as below. The only USB function required for this OMAP platform is to act as a USB-Device (connected to PC for data transfer.) In addition, we need to detect a non-USB accessory plug-in event by detecting VBUS voltage...
    on Aug 30, 2010

  • Forum Post: Re: TPS65920 - USB VBUS current issue

    Gandhar Dighe
    Hi, Havent seen this before. The readings you show for the failed units - is this when you connect the USB key or it is the variable resistance that you keep chaninging in steps to see the current behavior? Can you check the register bit that turns on the VBUS supply - DRVVBUS, before and after...
    on Nov 3, 2010

  • Forum Post: Re: VBUS detection in device mode

    Gandhar Dighe
    Hi, From PMIC side everything will be ok. USB communication will be independent of VBUS supply. However, you may want to check if this is ok with OMAP. OMAP may need VBUS detection or something from PMIC for the LINK to function correctly. You may want to check this on OMAP side and see if such scenario...
    on Nov 16, 2010

  • Forum Post: [TPS65921] How to read VBUS voltage through MADC

    Antony Lin
    How to read VBUS voltage through MADC in TPS65921? I can't find enable bit of VBUS prescalar in TPS65921 datasheet. Thanks, Antony
    on Dec 30, 2010

  • Forum Post: TPS65930 USB port in Host mode with VBUS current higher than 100mA

    Bartlomiej Swierczek
    Hi, I am working on very board space efficient deign with DM3730 and TPS65930. We need only one USB port working in HOST mode but capable to power connected device with VBUS current higher than 100mA. The target board dimensions are very small so we want to use ULPI USB OTG PHY build in TPS65930...
    on Sep 28, 2011

  • Forum Post: Is there anyway to get 5.5V on VBUS line in TPS65950?

    Vivek Neendoor
    Hi, I would like to know if there is anyway to get 5.5V on VBUS line of TPS65950? And if Yes, how it is possible? Thanks and Regards, Vivek
    on Feb 14, 2012

  • Forum Post: VBUS Held at 3.1V

    Chris R
    The VBUS pin of the TPS65950 on our board is at 3.1V and I can't figure out why. There's nothing besides the TPS65950 attached to the VBUS line that would drive a voltage, so it must be coming from the VBUS pin on the TPS65950, but I can't see why that voltage is present. The TPS65950 TRM...
    on Aug 22, 2012

  • Forum Post: TPS659xx USB B device Connect Disconnet Interrupt Generation

    RAJA SANKARAN
    Hi I an trying to configure the TPS65930 PMIC for USB B device Connect and disconnect interrupt generation. I configured following registers PWR_EDR1=0xBF,PWR_IMR1 = 0xF2,USB_INT_EN_RISE_SET =0x1F and USB_INT_EN_FALL_SET = 0x1F.Whenever I connect and disconnect USB cable with PC, USB OTG Functonlity...
    on Mar 31, 2013

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