TM4C1230E6PM: BOR0 and BOR1 doesn't reset

Hi,

I should have a reset on the BOR0

Best Regards

Hi,

  The threshold to cause reset will be sensitive to the temperature although during IC characterization they should be already taken into account. You may be very close to the edge to be detected for BOR. 

  Can you please answer a few questions?

  - At what voltage can you see BOR or you never see BOR at any voltages?

  - Can you try a few different parts?

  - How did you lower the voltage? Normally a brown-out is a sudden drop/dip in voltage like a spike. If you simply keep the voltage constant at a low voltage, it may not detect as a brown-out. 

  - For experiment, what if you set BOR0 and BOR1 to zero. Will you get an interrupt?

Hi,

When I have 2.46V, I have a reset. but Ihave have a external watchdog who have a reset at 2.62V. 

I have tested this BOR in two device but i have the same state.

the power supply used to power the system has steps of 0.42V then it's a sudden drop voltage.

I don't have yet tested with BOR0 and OR1 to zero

Best Regards

HI,

  I don't know the reason why it does not reset per the datasheet. Can you try with BOR0 and BOR1 equal to 0 and see if you get an interrupt?

  Searching through e2e archives, it was suggested an external voltage regulator instead of relying on the internal brownout detector the internal brownout detector is sensitive to noises. Do you have an voltage regulator? 

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/531504/tm4c123gh6pz-brown-out-reset/1952195?tisearch=e2e-sitesearch&keymatch=brown%20out%20reset#1952195

Hi,

I have a LDO with filtering capacity. The LDOis being re-sold and I can’t test it yet.

Best Regards.

Hi,

  Can you confirm in your code you have configured the type of reset issued due to certain reset events. See below example from the TM4C Peripheral Driver Library user's guide. This example will cause a brown-out event to generate a POR reset. Again, please note that the internal BOR detector is not meant to replace an external voltage regulator. You must have proper voltage regulator to monitor the power supplies on your systems.