i.MX ProcessorsのトピックRe: Power-On delay with MMPF0100

Power-On delay with MMPF0100

ottawa-imx6 — Tue, 14 May 2013 22:28:18 GMT

Hello everyone...,

We are designing based on the sabresd reference and use of the MMPF0100.

From what I can see, almost ALL commercial 'smart' devices have some form of power-on delay (2-4 seconds) to avoid powering up the system inadvertently. Strangely though, this very capable PMIC offers everything except this capability.

Does anyone have any suggestions for implementing a power-on delay with the MMPF0100 PMIC?

Thanks

Brent

Re: Power-On delay with MMPF0100

admin — Sat, 25 May 2013 22:44:58 GMT

From AnandBalakrishnan:

Hi Brent,

Unfortunately neither the PMIC nor the processor has built-in circuits to support this type of delay. You can use the below circuit to create a delay.

Regards,

Anand

Re: Power-On delay with MMPF0100

ottawa-imx6 — Tue, 28 May 2013 19:32:21 GMT

Thanks very much Anand, this will definitely help move us forward.

Regards

Brent

Re: Power-On delay with MMPF0100

jh_zhao — Wed, 30 Oct 2013 01:43:47 GMT

Is there a clearer picture?

Regards,

Jihua.

Re: Power-On delay with MMPF0100

ottawa-imx6 — Wed, 28 Jan 2015 21:04:16 GMT

Hi Everyone, Just following up on this older post. I believe that the processor might actuall contains logic to adjust the PMIC on/off time delay. I haven't tested it yet since our device already employs the required additional circuitry for the delay, but this may save someone else the added cost of this additional circuitry.....if it does work.

Grant... What do you think? I don't remember seeing this in the earlier versions of the documentation, so it may be simply newly documented.

Check out

57.9.10 SNVS_LP Control Register (SNVS_LPCR)

Re: Power-On delay with MMPF0100

admin — Wed, 28 Jan 2015 21:13:49 GMT

Anandkumar Balakrishnan

Anand, can you weigh in on this?

Thanks,

Grant