About TPS70451PWP

I used TPS70451PWP(Regulator) at our board.

 

i was applied to 5VDC at TPS70451PWP and then TPS70451PWP is applied DPS to 1.8VDC, 3.3VDC for I/O voltage.

If push the reset s/w or watchdog ic sends reset signal at MR(pin 5) of TPS70451PWP then TPS70451PWP sends reset signal at DSP.

 

Our customer complain our board, because our board was reset itself.

So, I’m looking for cause and I find that cold-solder joint at PIN1(GND) of TPS70451PWP.

Just PIN1(GND) of TPS70451PWP is disconnected from soldering pad.

 

I wonder if this situation is a problem.

 

I’m looking forward to reply

Hi ,

I believe that what you are saying is that when /MR is pulled to a logic low, that the /RESET signal goes low. This is correct behavior for this pin as per the description on page 11 and timing diagram on page 9 of the datasheet.

It is important that all of the GND pins are tied to Ground.

Very Respectfully,

Ryan