Pycom OEM modules are here... 4 MBytes of RAM and deep sleep test!

[mmarkvoort]

Nice, I am really curious about the deepsleep.

[daniel]

@jmarcelino yes, but the external ram as well as the flash is powered off when entering deep sleep. Only the internal RTC memory is preserved.

[River]

@daniel Amazing current consumption. Will be available on LoPy / SiPy existing dev boards or maybe the hardware needs some tweaking or changes?

Regards
PS. First post here, but reading the forum long time ;)

[jmarcelino]

Thanks @daniel :-) Look forward to it.

[exquisitus]

are these modules pin compatible with wroom-32. suppose i have a bunch of adaptor boards for wroom-32 and suppose i buy a bunch of those modukes, have not decided g01, l01 or f01 (?) would they play nice together?

[jmarcelino]

@exquisitusA
As the datasheets show the modules aren't compatible with the WROOM-32. Also the W01 is different from the L01/S01.

[daniel]

@exquisitus our modules are not compatible with the wroom-32, but they are compatible and interchangeable between them. Even though the W01 is smaller that the L01/S01/G01, if you design your board with the footprint to fit the bigger ones, you can always mount the W01 in the first half of the footprint.

Cheers,
Daniel

[loboris]

@daniel Have you done any tests using 4MB of external RAM ?

[daniel]

@loboris yes. Espressif gave us a special patch (not yet released) for the IDF to enable the external RAM. This patch also comes with several tests that run during start-up and verify that everything on the RAM and the cache is working properly. Espressif's team is still busy fine tuning the SPI RAM drivers (specially with regards to the cache) before they publish it on github.

[superfede76]

@daniel said in Pycom OEM modules are here... 4 MBytes of RAM and deep sleep test!:

The second video shows only the current drawn by the OEM module itself, and you will be surprised that it’s even better than the 5uA stated in the specifications!

In the video we see the current drawn by the OEM module is 2.9 uA, but it is not specified in what conditions. I tried the same test with an OEM module, but the current drawn is 6uA.
How do I have to test the OEM module to get the same result?

[daniel]

@superfede76 the current specified by Espressif is ~5uA, so I'd say that 6uA is still within spec. It varies from chip to chip and is also affected by temperature. Most of our modules show between 4.5 and 5.5uA.

[superfede76]

@daniel I think the 2.8uA of video is due to a little part of current drawn from pullup resistor of serial connection instead from the power supply. Without serial connection I think the current rise up 6uA (5uA for ESP32, like in Espressif documentation, and 1uA for LoRa module in sleep mode). what do you think about it?
regards
Federico