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a conflict between TPS65381 watchdog and Tms570 upgrade

Shuai Peng
Intellectual 780 points

My customer use the TPS65381 supply the TMS570,the TPS65381 NRST pin connect to the  TMS570 nPORRST pin,in program they use SPI to feed the watchdog, when the watchdog configuration is correct, they can work properly.

But there will be the following questions:

they want to upgrade the program of the TMS570 by JTAG,during the download time，there is no SPI signal to feed the watchdog,and the TPS65381 NRST pin reset the Tms570.the program could not be download in the Tms570.This seems to be in a  conflict state. Has anyone ever had a similar problem ?

  • 0
    TI__Guru 72500 points

    They should provide some means of identifying that they want to be in a debug mode instead of operating mode ( a jumper to change the state of an input pin) and then the software keeps the TPS in the DIAGNOSTIC mode. There are several ways to do that documented in the flow chart on page 10 of SLVA528.