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if you use the DY-FFTB V3.0,the led2 connectted to the BQ24230 pin9(Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high impedance when charging is complete and when charger is disabled). ,if you want to get the user guide about DY-FFTB6638 V3.0,you can send a e-mail to support@gototi.com
