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LAUNCHXL-F28P65X: Booster Pack power sequencing

Richard KELLY
Prodigy 50 points

Part Number: LAUNCHXL-F28P65X

Tool/software:

Hi,

We have a prototype design with LAUNCHXL-F28P65X fitted to a mother board. LAUNCHXL-F28P65X is powered from USB-C, mother board has its own power supply system.

In the scenario where the mother board is powered before USB-C is connected, analog and GPIO pins of the F28P650DK would be powered before VDD or VDDA.

According to the Absolute Maximum Ratings of the TMS320F28P65x Real-Time Microcontrollers data sheet (SPRSP69B – JULY 2023 – REVISED NOVEMBER 2023), provided the Input Voltage limits of -0.3V to 4.6V are met then the F28P650DK would not be damaged. Is that correct?

The aim is only to avoid damaging the LAUNCHXL-F28P65X in this possible case.

Regards

Richard

  • +1
    TI__Mastermind 21161 points

    Hi Richard,

    I think your best option to avoid damaging the device would be to power the LAUNCHXL-F28P65X board through the external mother board, which is supported in the LaunchPad design. You can isolate the power coming from the USB-C cable by removing both jumpers at JP1. If you're supplying 5V from the mother board, J16 is connected and J17 is disconnected. If supplying 3.3V, then you will want to make sure J17 is connected and J16 is disconnected. You can still use the onboard JTAG by plugging the USB-C in while the JP1 power is disconnected, the JTAG signals will go through the isolator to the C2000 MCU.

    Please refer to section 3.1.2 of the LAUNCHXL-F28P65X for more information on the power domain of the device.

    There are some power startup requirements which are detailed in the datasheet, these also need to be followed in addition to the absolute maximum rating to avoid damaging the device. If you follow the power domain instructions in the user guide, that will mitigate damage to the device.

    Regards,

    Peter