PCF8523 3295 doesn't keep time when powered off - FIXED

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sandyscott
 
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PCF8523 3295 doesn't keep time when powered off - FIXED

Post by sandyscott »

I'm using the Adafruit 3295 PCF8523 breakout module in a project with a Pi Pico running MicroPython.

I just fixed an issue that was driving me nuts - it was losing the hour and year when it lost power (new battery was installed). The problem was that although the chip is designed for battery backup - It isn't enabled by default!. Turned it on (ie. set bits 5-7 of register 0x03 to 000) and all is well.

Anyway, this won't be an issue for anyone using the CircuitPython driver, but for anyone else, I hope this helps.

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