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OMAP35x MMC (eMMC) Boot when using TPS65930 PMIC

Ranjithkumar Muthurajan
Prodigy 90 points
Other Parts Discussed in Thread: TPS65930, OMAP3530, TPS65950

Hi ,
In our OMAP35x based design, we are using TPS65930 PMIC for Power supply.
We are using MMC PORT-1 from OMAP for eMMC interface and eMMC is used for booting. The IO logic is 3.0v.
We have connected VDDS_MMC1 of OMAP to VMMC1_LDO of PMIC.

As per the PMIC datasheet, VMMC1_LDO output is OFF in default.
The OMAP ROM code configures the PMIC through I2C to set VMMC1_LDO is set to 3.0 V when booting from MMC port 1 is requested from the sys-boot pins.

In TPS65930 PMIC datasheet [SWCS037E, Page 28/114, Table 4-1], the default voltage VMMC1_LDO mentioned as 1.8V

But as per User Manual Ver D [Page 401/800] mentioned as
“The default output voltage of VMMC1 for the Master_C027 boot mode is 1.85 V, which corresponds to a value of 0x0 for the VSEL bit field “

It looks contradictory. Please confirm, what is the default output voltage of VMMC1_LDO of TPS65930 PMIC?

Is the MMC (or eMMC) OMAP boot tested with TPS65930 PMIC?

Thanks
Ranjith

  • 0
    TI__Guru 64500 points

    I would suggest reviewing the "Powering OMAP3 with TPS65930/20: Design-In Guide User's Guide" as well.  This helps pull together the concepts.

    Also, keep in mind, for connection to OMAP3, you will not be using the Master_C027 mode, but rather the Master_C021 boot mode.

    Ranjithkumar Muthurajan said:

    In TPS65930 PMIC datasheet [SWCS037E, Page 28/114, Table 4-1], the default voltage VMMC1_LDO mentioned as 1.8V

    I don't see the same default voltage for VMMC1_LDO as you mention.  Looking at Table 4-1 on page 28 of SWCS037E, I read the default voltage being 3.0V.

     

    [/quote]

    Ranjithkumar Muthurajan said:


    But as per User Manual Ver D [Page 401/800] mentioned as
    “The default output voltage of VMMC1 for the Master_C027 boot mode is 1.85 V, which corresponds to a value of 0x0 for the VSEL bit field “

    As mentioned, you will be using boot mode Master_C021 when using OMAP3.

    Ranjithkumar Muthurajan said:


    It looks contradictory. Please confirm, what is the default output voltage of VMMC1_LDO of TPS65930 PMIC?

    There is a distinction between the power up, default voltage of VMMC1_LDO and what the OMAP3530 ROM code configures it to be over the I2C interface.

     

    [quote user="Ranjithkumar Muthurajan"]

    Is the MMC (or eMMC) OMAP boot tested with TPS65930 PMIC?

    The TPS65930 is a very close relative to the TPS65950.  I'm not aware of a development platform that specifically uses the TPS65930 with OMAP3, but I do not have any reason to believe this is not a valid combination.