EN pin pulse low-period

mikeatom
Posts: 10
Joined: Tue Feb 02, 2016 6:47 pm

EN pin pulse low-period

Postby mikeatom » Tue Feb 02, 2016 6:54 pm

Hi,

When using the ESP8266EX EN pin to reset the module, what is the expected length of the low period?
And what is the voltage level low and high boundary for that pin?

I discovered by random experiment that a 20uS low pulse is too fast, but about 100uS works. And I'm assuming low is <0.8V for EN ?

As we want to include this module in a retail product, and I couldn't find these details in your datasheet, I would like to seek your confirmation on what the official specifications are? (Always better than my guesswork!)

Thank you and best regards.

Espressif_Kelly
Posts: 140
Joined: Mon Oct 27, 2014 10:40 am

Re: EN pin pulse low-period

Postby Espressif_Kelly » Wed Feb 03, 2016 11:32 am

Dear Sir,

Delay time of CHIP_EN is mainly depent on external RC circuit and 100us low pulse is safe for reset.

The threshold value of CHIP_EN can be range from 0.5V to 0.8V(about 0.25VDD).

Thanks.

mikeatom
Posts: 10
Joined: Tue Feb 02, 2016 6:47 pm

Re: EN pin pulse low-period

Postby mikeatom » Wed Feb 03, 2016 9:28 pm

Thank you for confirming.

May I ask if you have a timing diagram available for the EN pin? Or at least do you have the minimum and maximum time for the low period?

If possible, I would like to use a time period which is not so close to the min or max boundary.

My concern is that if 100uS is close to the min or max low period, then sometimes (due to RC tolerances) the reset may not work. I'd would rather increase or decrease the proposed 100uS low period to a number which is somewhere between the EN timing range. I can set any low-time once I know what the range is! I hope that makes sense.

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