Compiler/TM4C123GH6PM: Lock RESET Pin

PabloGJ

Part Number: TM4C123GH6PM

Tool/software: TI C/C++ Compiler

Hi,

I am using a TM4C123GH6PMI7 to control a Battery Management System.

The problem is that, when I close a contactor, it produces EMIs that couples to my PCB through RESET track, producing a reset of the microcontroller. To solve that, I want to lock reset pin when I close this contactor to avoid that problem.

Anybody know how to lock reset pin?

over 5 years ago

0 Bob Crosby over 5 years ago

TI__Guru 72500 points

What value did you use for the pullup resistor on RST-? I have highlighted some information from page 215 of the datasheet that talks about precautions to take with the RST- pin.

0 PabloGJ over 5 years ago in reply to Bob Crosby

Prodigy 20 points

Im using a pull-up of 10k and a capacitor of 10nF. Moreover, I have tried put capacitors of differents frecuencies in parallel, but it doesn't works.

0 Bob Crosby over 5 years ago in reply to PabloGJ

TI__Guru 72500 points

Are you sure that the issue is with the RST- pin? If you have conducted noise on the power or GND pins, the device can assert a reset through the internal power-on reset or brown-out reset. If this is the case, you need to design the system to eliminate the noise or isolate the microcontroller from the noise.

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Compiler/TM4C123GH6PM: Lock RESET Pin