Category: Hardware
Product Number: MAX1758
I have a MAX1758 charger set up to charge a 4S1P pack using an 18V DC input. When I attach my DC in with no battery and apply power, the Fast Charge pin goes low and indicates fast charge mode. If I attach a battery, it behaves as expected. The bit goes low during charge and high when charge complete. When I do this on the reference design, it doesn't behave this way. The Fast Charge bit stays high as expected when no battery is attached. I have the Fast Charge bit connected to an LED same as the reference design. I also have it running to my processor with a diode for isolation, but even if I remove the diode I get the same behavior. Schematic page attached for reference.
