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by londons_explore
158 days ago
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But you need very very little digital logic... The same kind of quantity to do the little power indicator LED's on a battery bank (which are charlieplexed btw), and thats done in the same ASIC that also has the 5V boost power supply (multi-amp gnd isolated n type mosfet) and charge circuitry involving voltage references and laser tuned comparators, and sometimes negotiates USB-C PD as well (needs an internal ROM). And the whole thing needs to be really cheap and with a standby current of uA's. As long as you aren't interested in multi-Mhz operation, combining the rest at very low cost isn't too tricky. |
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But simplicity isn't always the goal. I have a throwaway vape here with a color LCD screen that plays full-motion animations.
To be sure, that's not necessary at all. But this functionality does exist, and people do buy them.
IIRC, they're said to use a 48MHz Cortex M0 part. More information here: https://github.com/ginbot86/ColorLCDVape-RE