MCU_Board_A_v1.0.2b0
It's the second revision of my microcontroller board that I used on the company where I work. Apparently, the downside of the device was it doesn't have pin for external battery to back up the internal RTCC of the mcu. So to back it up when the supply off, we need external circuitry consisting of pair of diode. It's not backup the RTCC only, but actually back up the whole mcu. On my previous revision I used a general purpose diode, then I got a too big voltage drop, now I pick a schottky type diode on this revision, so that the drop is just 0.1-0.2V on the 3.3V supply line to my device.
Apr 08,2022
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