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  1. #1
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    Issue in sim808 of power down mode

    Hello all,

    i have one issue in sim808 module.

    1) when i connect VBUS pin to the +4.1Vdc and connect battery to the VBAT pin sim808goes in power down mode when i disconnect it external battery.

    2) When i connect VBUS pin from +5V dc continuous supply(charger) and connect battery to VBAT pin my sim808 restart continuously.

    i have Li-Ion 3.7V dc battery.

    3)and also tell me what would be the exercise if i dont want to connect battery. and sim808 works only on external power source(+4.1DC).

    4) if there is no solution without connecting external battery please let me know how do i automatically get it in normal mode after power down mode when battery fully discharge and i connect it with external supply.

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  2. #2
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    hamidrezamaddah's Avatar
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    Re: Issue in sim808 of power down mode

    if you dont want to connect battery, you should connect the +4.1Vdc to VBAT pin


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  3. #3
    Newbie level 5
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    Re: Issue in sim808 of power down mode

    hi hamid, it works.
    thanks for it.

    but i have doubt that if i want to connect battery then what should i do and where should i connect it (also want to prevent battery from over voltage charging).



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