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TPSM83102: Relationship Between TPSM83102 EN Pin and Register Configuration

liu pangpang
Prodigy 60 points
Part Number: TPSM83102


Hello Support Team,

According to the datasheet, pulling the EN pin high enables the TPSM83102 output (VOUT), and pulling the EN pin low disables the output.
My question is:

If the EN pin is pulled low, will the device lose the I²C register settings that were previously configured and revert to their default values?

Thank you.

  • 0
    TI__Mastermind 29055 points

    Hello, we have received your case and the investigation will take some time. Thank you for your patience.

  • 0 回复 Eirwen
    TI__Mastermind 29055 points

    EN pulls low will not lose the I²C register settings

  • 0 回复 Eirwen
    Prodigy 60 points

    In my application, I have observed the following behavior:
    After initializing and configuring the registers via I²C, my software uses the EN pin to enable and disable the output. However, once the EN pin is pulled low, and then later pulled high again, the VOUT output does not come back — confirmed with a multimeter.

    I have repeated this many times, and the result is always the same.

    This behavior is inconsistent with the explanation that EN only controls the converter output and should not affect the register settings.
    Why does this happen?

    My register configuration is as follows:

    Tpsm83102_Data_Control1.bit.CONVERTER_EN = 1;
    Tpsm83102_Data_Control1.bit.EN_SCP = 1;
    Tpsm83102_Data_Control1.bit.EN_FAST_DVS = 1;

    Tpsm83102_Data_Control2.bit.TD_RAMP = 7;
    Tpsm83102_Data_Control2.bit.CL_RAMP_MIN = 1;
    Tpsm83102_Data_Control2.bit.EN_DISCH_VOUT = 3;
    Tpsm83102_Data_Control2.bit.FAST_RAMP_EN = 1;
    Tpsm83102_Data_Control2.bit.FPWM = 0;

  • 0 回复 liu pangpang
    TI__Mastermind 29055 points

    The TPSM83102 has a internal EN bit, called CONVERTER_EN, in register 0x02.

    In default the CONVERTER_EN is 0. After Vin > UVLO and the EN pin is high, the device is still in disable status. You have to set CONVERTER_EN = 1 to enable the device.

    Pilling down the EN pin to low will reset all the I2C register. But set CONVERTER_EN = 0 won't reset the registers.

    If you need the default ONVERTER_EN is 1,  TPSM83103 can be the option.