Thank you! That is very helpful information. I think U6 will be my target for additional hardware interfaces since I can get a datasheet for the part (and replacements) and because U6 seems to be powered even when the device is off.
I think my first goal will be to add an accelerometer to the Glo. I could put it on the I2C bus of the SoC itself but I'd like to wake the device via "shake and wake" which requires the powered MCU.
Once (if) I get that working it should be possible to pass the accelerometer data to the
Android framework...not that I'm savvy enough to pull that off right now.
I'll order a couple of those MCUs from digikey. Meanwhile it is time to get the oscilloscope and i2c bus analyzer going.
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unfortunately i haven't found anything that looks like a firmware update routine
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I doubt that there is a firmware update function for U6. If you botched an update to it you could lose control of your power supplies and possibly brick the device.