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Original question:

TPS65214: I want to know the reason and solution for this inability to output normally

TPS65214: The default output of PMIC

JUNZHI LIN
Prodigy 110 points
Part Number: TPS65214

Tool/software:

Hello expert, I would like to confirm the default output voltage of each power supply for the PTPS6521402VAFR PMIC chip. Thank you!

  • 0
    TI__Genius 9297 points

    Hello Junzhi, 

    Here are the default output voltages for PTPS6521402:

    PMIC Rail Default Output Voltage
    BUCK1 0.75 V
    BUCK2 1.80 V
    BUCK3 3.30 V
    LDO1 1.80 V
    LDO2 2.50 V

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 110 points

    What are the default output voltages for each channel of the PTPS6521402VAFR?

  • 0 in reply to JUNZHI LIN
    TI__Genius 9297 points

    Hi Junzhi, 

    The above values are the default output voltages for PTPS6521402VAFR. (This is the same as PTPS6521402)

    Let me know if you meant something else, or need additional help with this device. 

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 110 points

    Currently, I have obtained this PMIC and want to verify its output. However, upon actual measurement, it was found that when using this circuit for verification, the PMIC did not output anything. Only VPP1P8 had a voltage of 1.78V, while the other LX and LDO did not output anything. Is there a problem with this verification circuit? Could you please provide the simplest verification circuit? Thank you!

  • 0 in reply to JUNZHI LIN
    TI__Genius 9297 points

    Hi Junzhi, 

    I do not notice any issues with the schematic. VDD1P8 showing 1.78 is a sign that PMIC is being powered on correctly. 
    The schematic in the TPS65214EVM user guide can be used as reference for verification circuit. 

    Are you able to capture the startup signals of VIN signal, EN, GPO, and BUCK2 pin on oscilloscope, if possible?

    Can you also check if nRST pin is outputting HIGH or LOW?

    Thank you, 
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 110 points

    Hello, currently, the output of my verification is as follows: when the GPIO/VSEL pin is pulled up to 3.3V, BUCK1 is not 0.75V by default. May I ask what the reason is?

    BUCK1:The output is variable.

    BUCK2:1.8V

    BUCK3:1.2V

    LDO1:1.8V

    LDO2:2.5V

  • 0 in reply to JUNZHI LIN
    TI__Genius 9297 points

    Hi Junzhi, 

    What voltage does BUCK1 change to when GPIO/VSEL is HIGH?

    Are you using I2C in your system, and are you able to provide the register readings?

    Specifically, the values at addresses 0x01, 0x41, and 0x1F ?

    This looks like Buck1 is configured as the VSEL rail for GPIO/VSEL pin,
    but this should not be the case for PTPS6521402VAFR default settings, please help to share the register values if you are able, so I may confirm the reason for the issue here.

    Best Regards,
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 110 points

    Currently, we are only conducting pure hardware verification and there is no connection to the SOC. The I2C signal has only been pulled up, and it has not been connected to the AM62Lx or any other SOC. The output waveform of BUCK1 is as follows and it is constantly adjusting in a loop.

    BUCK2 and BUCK3 will not adjust again after stabilization. For example, the waveform of BUCK3 is as follows.

  • 0 in reply to JUNZHI LIN
    TI__Genius 9297 points

    Hi Junzhi, 

    Thank you for sharing the waveforms. It may be harder to understand the problem without I2C readings, so I may have some more questions. 

    This initial oscillation is not normal for any of the outputs. The output should immediately be stable for BUCK2, BUCK3 . 

    Can you also share waveform for VSYS input, to see if it is noisy?

    The outputs look to be picking up some higher voltage up to 2.8 V.
    Are you able to share the layout? This can be shared over our email thread, if necessary. 

    Best Regards, 
    Sarah