Programmed power cycle on TPS65217

qxc

Other Parts Discussed in Thread: TPS65217

Hi,

is there a possibility to program a full power cycle via I2C?

I'm looking for a similar function like it can be done via the PB_IN pin, but in a fully programmatic way and without this very long 8 sec delay. Is this possible?

Thanks!

over 9 years ago

0 Richard Solarski over 9 years ago

TI__Genius 10885 points

Yes this is possible,

One way is to set the SEQDWN bit to shutdown the regulators, then set the SEQUP bit to bring all the rails back. Both commands would require writes to the PASSWORD register of the value 0110 0011 (0x63h) before hand, as register 0x1E is password protected.

Would this work for your application?

0 qxc over 9 years ago in reply to Richard Solarski

Genius 5820 points

OK, but after shutting down the regulators, the SoC accessing the PMIC is turned off too and I can't write anything to the PMICs registers any more. Isn't there a sequence where power-up is done automatically?

0 Richard Solarski over 9 years ago in reply to qxc

TI__Genius 10885 points

This typically requires toggling a logic input, such as with the PWR_EN or nRESET pin, but both would have to be re-asserted before the PMIC could return to ACTIVE mode.

0 Fred_S over 9 years ago

Prodigy 40 points

I am using the TPS65217 with an Am335x processor. I use the RTC in the Am335x to power down to RTC only mode and then power back up on a second alarm. It's not a full power down, but rather close.

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Programmed power cycle on TPS65217