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TPS65930 VMMC2 query

Adrian Grindon
Expert 8050 points
Other Parts Discussed in Thread: TPS65930

Hello,

Could you help with the following query froma  customer using the TPS65930 with an OMPA3530

We are trying to resolve an issue with running a 3.0V SDIO part on MMC2 using level shifters. The driver for the part looks at what voltage the MMC port it's on is running at and then uses this to determine whether the attached device is compatible. As the SDIO specs (v1.0 and V2.0) do not support 1.85V the driver determines that MMC2 does not support SDIO and sends the first CMD5 out to the device without a voltage. This eventually causes the driver to timeout as the device stops responding.

 

We've been looking at the LDO for the MMC2 ports and have come across the register VMMC2_DEDICATED (see page 308 of the TPS65930 TRM). This register sets the voltage on the LDO for VMMC2 however there is no LDO for VMMC2 as far as we can see. The various documents on the OMAP suggest that VMMC2 has to be set to 1.8V within the OMAP.

 

Given that the VMMC2 settings in the TPS65930 do not appear to go anywhere are we safe to set these to 3.00V as we believe this is where the driver is getting it's voltage settings from.

Thanks

Adrian

  • 0
    TI__Genius 15100 points

    Hi Adrian,

    I am sorry, I have difficulty understanding your question. I dont understand your comment "there is no LDO for VMMC2" and "has to set to 1.8V within OMAP"

    If the question is - if we can use VMMC2 to support 3V for SD cards then the answer is yes, you can use this voltage level.

    If I have not answered your question then please let me know. We can discuss further on this topic.

     

    Regards,

    Gandhar.