Casio fx-61F: Scientific Electric Formula 27
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04-12-2016, 12:38 PM
Post: #14
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RE: Casio fx-61F: Scientific Electric Formula 27
The HD62021A04 SoC seems to be able to work at really low power supply voltages, most probably at around a minimum of 1 Volt.
Some more details on the hybrid power supply: The two diodes allowing for solar panel/battery switching are marked on the PCB as MA700 and MA723 which should be schottky diodes. I measured them to check for Vf: - The MA700 has a Vf=0.5V. - The MA723 has a Vf=0.3V. This later diode must have a lower forward drop voltage as it is in series with the 1.5V single battery cell. So for a fresh battery, the SoC will see around 1.2Volt when operating in very low ambient light conditions. Jose Mesquita RadioMuseum.org member |
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