Kaktus621
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SIM300D Charging Circuit
Hello!
I have some questions related to the charging possibility of the SIM300D. My aim is to build a device, that can be as well used mobile (power by a LiIon-Battery) or e.g. in a car (powered by Car-Voltage).
What I understand by the datasheet is, that you connect the external supply _only_ to the VCHG pin (well, and common GND, of course) and everything else (SIM300 as well as the other controllers etc. is supplied by the battery.
Now lets look at the situation that the battery is charged to 100% but the external supply is still connected. Is the SIM300 smart enough to supply everything else by the external supply or will the battery still be used (that means it gets discharged a bit, then charged again by the charging circuit and so on and so on - isn't this bad for the battery?)?
If it's not "smart" enough and it's bad for the battery, what would be the best solution to the problem (i.e. not unnecessary (dis-)charging of the battery)? Do you think the attached schematic (well not exactly that, but something in this way) would work?
Thanks in advance,
Kaktus621
Hello!
I have some questions related to the charging possibility of the SIM300D. My aim is to build a device, that can be as well used mobile (power by a LiIon-Battery) or e.g. in a car (powered by Car-Voltage).
What I understand by the datasheet is, that you connect the external supply _only_ to the VCHG pin (well, and common GND, of course) and everything else (SIM300 as well as the other controllers etc. is supplied by the battery.
Now lets look at the situation that the battery is charged to 100% but the external supply is still connected. Is the SIM300 smart enough to supply everything else by the external supply or will the battery still be used (that means it gets discharged a bit, then charged again by the charging circuit and so on and so on - isn't this bad for the battery?)?
If it's not "smart" enough and it's bad for the battery, what would be the best solution to the problem (i.e. not unnecessary (dis-)charging of the battery)? Do you think the attached schematic (well not exactly that, but something in this way) would work?
Thanks in advance,
Kaktus621