Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, an initiative of Stroud Water Research Center designed to help people advance knowledge and stewardship of fresh water.
New to EnviroDIY? Start here

Mayfly 1.0 Qu

Home Forums Mayfly Data Logger Mayfly 1.0 Qu

Viewing 0 reply threads
  • Author
    • #16312

        @shicks just wondering what the expected standard charge is for the Mayfly 1.0

        I’m seeing via a USB Meter that with a USB-C charger that delivers 5.0V (and 2A capable) with a  4.4A LiIon battery at 3.8V that it is only charged 0.13-0.2A.   Previously Mayfly 0.5 this was the expected 0.5A

        Digging deeper into the BQ24074

        “Input-based dynamic power management (VIN- DPM) for protection against poor USB sources

        The USB input current limit accuracy and start up sequence allow the BQ2407x to meet USB-IF
        inrush current specifications. Additionally, the input dynamic power management (V-DPM) prevents the
        charger from crashing incorrectly configured USB sources.</span>

        Mayfly 1.0 has EN1=LO and EN2=Vbat (high) so program current range

        Current Limit = KLIM/RLIM ( 1550/1650) =0.94A

        Iset KISET/RSET  890/1500 = 0.59A

        So I would think it should be able to charge the battery at 0.59A

        Just wondering what you’ve seen. Many thanks.


    Viewing 0 reply threads
    • You must be logged in to reply to this topic.