ESP8266 Community Forum

- Thu Oct 09, 2014 6:06 pm #1494 Maybe divining rod is bad. How about the 12K resistor pin?

Or someone can ask them the fix the datasheet so that we don't have to guess.

Where I get my modules

- Thu Oct 09, 2014 11:46 pm #1499

I don't see any pin to connect an external Low-Frequency Crystal

The Sept. 8, 2014 datasheet from Espressif:

8.4.3 Real Time Clock IO (EXT_LFC):
If a 32.768 kHz LFC clock is available, it can be connected to EXT_LFC. If no clock is
available on this pin, the internal LFC will be used. If an EXT_LFC is available, the selection of
LFC source, internal LFC or EXT_LFC can be done by a strapping pin

However, what pin this EXT_LFC is, and what pin should be strapped is, at the moment, uncertain.

https://github.com/esp8266/esp8266-wiki/wiki/Pin-definition gives pin five as VDD_RTC, NC (1.1V). I'm not entirely sure how to interpret that, or what it's based on. No connect, has 1.1V on it when measured? If I pull that low, will I burn the internal RTC-s power supply or just disable the internal clock and is that enough to force the chip to use the external one? Gah.

Or someone can ask them the fix the datasheet so that we don't have to guess.

That would be best, I guess, but who should I talk to about that? I understand there is someone who's in contact with them?

- Thu Oct 09, 2014 11:55 pm #1500 My guess was that pin 5 (VDD_RTC) was meant to connect a coin cell battery for powering internal RTC during deep sleep.

But there are a lot of questions raised by incomplete statements available in the datasheet, like ADC, I2S, etc.

Maybe wes should start a topic listing them?

- Sun Oct 12, 2014 9:17 pm #1558 Topic started at http://www.esp8266.com/viewtopic.php?f=5&t=339.