TPL5010: RST Pin error

Xinjun Dong

Part Number: TPL5010

Hello,

I am using TPL5010 to rest my microcontroller at certain period, but I come up with an issue. Following is the problem I have:

1. I am using battery to power both TPL5010 and the microcontroller.

2. I am using RST pin to reset the microntroller in case that the program is frozen. I could not use the watch dog in the microcontroller, because our board might go frozen by ESD and no program is running. The microcontroller can only be rest by pulling down the rest pin in that scenario.

3. However, when the battery is used up and I plug to charge the battery. The RST pin on TPL5010 is always low, and as a result the microcontroller cannot be turned on.

I was wondering whether anyone else has come up with the same issue. Any help is appreciated.

Thanks in advance.

over 6 years ago

0 Adam Siismets over 6 years ago

TI__Intellectual 950 points

Hello,

Could you send a picture of your schematic? This will help us debug your problem.

Also, according to the datasheet, the RSTn pin will be held low in the following two conditions:

1: If the DELAY/M_RST pin is high for at least two consecutive cycles of the internal oscillator (approximately 20 ms).

2: At the beginning of a new time interval if DONE is not received at least 20 ms before the next WAKE rising edge

Since it seems like you are not using the watchdog timer, does this mean you have nothing connected to the DONE pin?

Regards,

Adam Siismets

Clock & timing

Clock & timing forum

TPL5010: RST Pin error