topic Re: SRC_POR_B timing in Power Management

SRC_POR_B timing

yuji_fuseki — Wed, 15 Jan 2020 09:25:33 GMT

Hello,

During power-up sequence, when SRC_POR_B must be asserted to LOW in I.MX6DL?

Best regards,

yuji

Re: SRC_POR_B timing

igorpadykov — Thu, 16 Jan 2020 00:42:45 GMT

Hi Yuji

SRC_POR_B must be asserted immediately, at first step of power-up sequence.

Best regards
igor
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Re: SRC_POR_B timing

yuji_fuseki — Thu, 16 Jan 2020 11:23:34 GMT

Hi, Igor

Thanks for your answer.

I have an another question about SRC_POR_B timing.
When can we provide voltage to SRC_POR_B to release reset after power supply become stable?

Best regards,

Yuji

Re: SRC_POR_B timing

igorpadykov — Fri, 17 Jan 2020 00:35:39 GMT

Hi Yuji

what processor used in the case, one can look at

its datasheet, power-up sequence chapter.

Best regards
igor

Re: SRC_POR_B timing

yuji_fuseki — Mon, 02 Nov 2020 14:34:15 GMT

Hi, Igor

I found below explanation at the datasheet.

please let me make clear below points.

(a)Does this meas SRC_POR_B signal can be immediately deasserted after VDD_xxx_CAP supplies are stable?

(b)If the answer is YES for question(a), is it not necessary to wait other voltage become stable?

(c)Decided to use I.MX6 Dual Lite. so, is there dedicated specification for SRC_POR_B timing?

Br,

Yuji

Re: SRC_POR_B timing

yuji_fuseki — Wed, 12 Feb 2020 03:42:19 GMT

Hi,

Please response to my questions.

Br,

yuji

Re: SRC_POR_B timing

igorpadykov — Wed, 12 Feb 2020 09:49:57 GMT

Hi Yuji

>(a)Does this meas SRC_POR_B signal can be immediately deasserted after VDD_xxx_CAP

>supplies are stable?

> (b)If the answer is YES for question(a), is it not necessary to wait other voltage become stable?

it is necessary to wait until all other power supplies become stable.

> (c)Decided to use I.MX6 Dual Lite. so, is there dedicated specification for SRC_POR_B timing?

there is no dedicated specification for SRC_POR_B timing.

Best regards
igor

Re: SRC_POR_B timing

yuji_fuseki — Thu, 13 Feb 2020 02:30:29 GMT

Hi, Igor

Thank you for your response.

>it is necessary to wait until all other power supplies become stable.

No numerical specification from after all power supplies become stable to SRC_POR_B dessertion?

Br,

yuji

Re: SRC_POR_B timing

igorpadykov — Fri, 14 Feb 2020 02:17:34 GMT

Hi Yuji

>No numerical specification from after all power supplies become stable to SRC_POR_B dessertion?

right.

Best regards
igor

Re: SRC_POR_B timing

yuji_fuseki — Mon, 17 Feb 2020 02:37:57 GMT

Hi Igor

OK.

I understood the SRC_POR_B requirement at power-up timing.

Thanks for your strong support.

Br,

Yuji