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bwack / C64-Saver-bwack

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Errors on the addon board #8

Closed bwack closed 6 years ago

bwack commented 6 years ago

Debugging the addon board 1.0 pcba

bwack commented 6 years ago

U7 MCP1700 not handling over-voltage condition. Get MCP1754ST-5002E/CB https://www.elfadistrelec.no/no/ldo-spenningsregulator-sot-23a-microchip-mcp1754st-5002e-cb/p/17386686

bwack commented 6 years ago

When voltage is brought down below the threshold, the display stops updating.

OVERVOLTAGE is connected to the #RESET input of the MCU. We need the reset for the ISP to work. Here is a workaround: voltagedivider + adc !

https://electronics.stackexchange.com/questions/195146/use-the-reset-pin-on-attiny85-as-input-with-voltage-divider