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TPS6521825: DCDC3/DCDC4 Default ouput

user6333457
Prodigy 50 points
Part Number: TPS6521825
Other Parts Discussed in Thread: TPS65218D0

Hi,

Which one is the TPS6521825 default ouput voltage?

a) DCDC3=3.3V, DCDC4=1.8V (for i.mx8mm)
b) DCDC3=1.2V, DCDC4=3.3V (datasheet table 5-2)

I am worried that the contents of the table below are different from the Device Overview.
We will used the TPS6521825 combination with LP873347RHDT for i.mx8mm.

And how many resistance values should i choose for DC34_SEL? pre-programmed=0?

Best Regards,

  • 0
    TI__Mastermind 30310 points

    If DC34_SEL = short to GND with 0-Ohm resistor, then DCDC3 = 3.3V, DCDC4 = 1.8V because the PMIC will boot with the following programmed default values in EEPROM:

    • Refer to Register 0x18 (DCDC3), bits [5..0]: Reset value = 0x3D = 3.3V (this is the programmed default value for TPS6521825)
    • Refer to Register 0x19 (DCDC4), bits [5..0]: Reset value = 0x14 = 1.8V (this is the programmed default value for TPS6521825)

    Ignore that is says DCDC3 = 1.2V, DCDC4 = 3.3V because these are only the programmed default values in the TPS65218D0 variant of the device. All other variants have different programming and will result in different output voltages when DC34_SEL = short to GND with 0-Ohm resistor.

  • 0 in reply to Brian Berner
    Prodigy 50 points

    Thank you for your quick reply.

    I was relieved to be able to confirm the default settings.

    Best Regards,