TPS767D301-EP: Reset Output

Hello Naveen,

Are you able to monitor the power rails to the TMS device and see if there is a power supply issue? Also if you are able to upload your schematic so we can see if we find any issues that would be helpful.

Thanks,
Kyle

Hi Kyle,

Thanks for the reply.

I have monitored the power rails and found OK. I suspected power rails initially, but if it is so there must be reset time out of 200ms gap. but in my case it is only 15uS and later 4,5mS. I attached schematics. Please reply.

Hello Naveen,

Thanks for the schematic. I know you said the power supplies look good (and I agree with your assessment that if they fail we would expect a 200ms reset), but are you able to upload waveforms of Vin, Vout, and Reset as well? It would also be useful to see an AC coupled Vout so we can see if there is any minor change on Vout. Hopefully the waveforms plus the schematic will help us figure out what is going wrong.

Thanks,
Kyle

Hello Naveen,

I'm just follwing up on this question to see if you have been able to obtain the requested waveforms.

Thanks,
Kyle

Hi Kyle,

I'm sorry for delayed response. I could not share waveform with TI since I didn't capture them. But I found the answer i believe. It is due to internal watch dog timer. WDT is setting it to low 15uS. Once I gave trst# high, I could see clean reset signal. Thank You so much for supporting.