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TMS570LC4357: cannot connect to the emulator, nRST is always low.

Part Number: TMS570LC4357

Hi team,

There are two PCBs, one is starting normally, one TMS570 nRST pin is always low, and the emulator is not connected. Checked that the peripheral circuits and power supply are identical, how to troubleshoot the cause, there are several reasons in the manual, but the registers cannot be read out, customer would like to know is there a good way to achieve this.

Thanks!

Best Regards,

Cherry

  • Hi Cherry,

    Is the device on the failed board a blank device? Are all the power supply rails on this board OK (3.3V, 1.2V, 5V, others)? Is the power consumption reasonable? Is the MCU device hot after the board is powered for a while? What is the resistance between nRST and GND/3.3V when the board is not powered?