Normally I have the current limit set to 1.5A. I disconnected the HL7648 setup and set the power supply limit to 100 mA to charge a single LIPO cell. Then I connected the HL7648 but forgot to raise the current limit. The PWR_ON_N pin is pulled low to boot it. The HL7648 current draw jumps to about 50 mA and never changes. The AT interface doesn’t work and the UART1 CTS stays high.
I think I must have bricked the HL7648 due to the 100mA current limit. This also means the module might be bricked if powered up on a dead battery. Is there any recovery? The reason I ask here is the only way I know how to get a replacement module is through DigiKey and presently their shipping delay is about a week due to Covid restrictions.