TPS3103: Issues with /RESET output on TPS3103

Jeremy Hills

Part Number: TPS3103

I'm hoping you can help - we've seen some strange behaviour from the TPS3103 chip. Although this state is rare we have measured, with a DVM, that the output voltage is measuring at 0.97V and holding the device in a reset state even though Vdd = 3.27V /MR = 3.26V . This effect recovers and then hasn't occurred since but would like to understand possible reasons for this behaviour. Any help appreciated.

over 6 years ago

0 Marcoo Z over 6 years ago

TI__Mastermind 19610 points

Hi Jeremy,

Can you share your schematic?

0 Jeremy Hills over 6 years ago in reply to Marcoo Z

Prodigy 40 points

No problem -please find below

0 Jeremy Hills over 6 years ago in reply to Jeremy Hills

Prodigy 40 points

H Marcoo did you have any update on this one? thanks

0 Marcoo Z over 6 years ago in reply to Jeremy Hills

TI__Mastermind 19610 points

Hi Jeremy,

I do not see an issue with the schematic. I would isolate the TPS3103 and see if you see the issue isolated. So TPS3103 + R83.

Is there a chance that the RESET line is being pulled down externally? Like leakage through another pin?

0 Jeremy Hills over 6 years ago in reply to Marcoo Z

Prodigy 40 points

Thanks,

We can try this, the fact it seems to come and go with very distinct voltage level differences makes me doubt a passive type of failure- but worth ruling out for sure.

One aspect we were unsure of is the /MR input voltage. If this went slightly higher than Vdd, either transient or DC, could we see behaviour like this?

0 Marcoo Z over 6 years ago in reply to Jeremy Hills

TI__Mastermind 19610 points

Hi Jeremy,

Jeremy Hills said:

One aspect we were unsure of is the /MR input voltage. If this went slightly higher than Vdd, either transient or DC, could we see behaviour like this?

The MR is only rated up to VDD. We do not recommend having an MR higher than VDD. I am unsure on what happens if MR > VDD.

If you suspect this might happen, we do have devices where MR and VDD should be independent.

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TPS3103: Issues with /RESET output on TPS3103