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TP5010 Startup- RSTn

Shuli Shmaya83
Prodigy 220 points
Other Parts Discussed in Thread: TPL5010

 

Hi,

I would like to use TPL5010 as wake up timer and watchdog timer.

Hence, I'm going to connect TPL5010's RSTn output to CPU's reset, and WAKE, DONE signal to CPU's GPIOs.

My question is related to TPL5010's RSTn output:

For the first time of board powering, while the CPU is not programed yet, does TPL5010's RSTn output will be asserted following any timeout ?

I've read in the forum that: " The TPL will not output a WAKE if no DONE input is received. Instead, a periodic RSTn signal will take place. " and my concern is how should I program/flash the CPU while TPL5010 assert RSTn signal periodically ?

Thanks,

Shuli


RSTn

  • 0
    TI__Prodigy 160 points

    Hi Shuli,

    What do you plan to set your timing interval to? If you look at Figure 9 on the datasheet, during startup, initially RSTn will go high after POR time+ Rext reading time + RSTN pulse width time. Once this happens, the time interval starts, and the CPU has tip-20ms to perform operations and send a DONE to avoid the TPL from asserting RSTn low at the begininng of the NEXT time interval. Essentially, this first DONE signal is a kickstart for the TPL to avoid sending a RSTn.

    Best,

    Nikhil

  • 0 in reply to Nikhil Dua
    Prodigy 220 points
    Hi Nikhil,
    Thank you for your prompt reply.

    Please note at this stage the CPU in un-burned, so toggling DONE signal is not an option.
    Furthermore, trying to flash CPU with external programmer may fail since RSTn signal from TPL5010 may asserted and reset the CPU while in programming process.

    So I wonder how should I overcame this ?

    btw -timing interval set to 1 sec.

    Thanks,
    Shuli
  • 0 in reply to Shuli Shmaya83
    TI__Prodigy 160 points

    Hi Shuli,

    Currently there does not exist a way to "shut off" the watchdog.  

    My thought was, given your long time interval, are you able to program the CPU within it? Essentially, on startup, after RSTn is high, the CPU will have 1s to be programmed and send a DONE before RSTn is pulled low and the CPU is reset.

    Best,

    Nikhil 

  • 0 in reply to Nikhil Dua
    Prodigy 220 points

    Thanks Nikhil. You answered my question.

    Shuli