I'm comparing the DV2031S2, Rev B evaluation module to a circuit we manufactured in house copying the schematic given in the DV2031S2 datasheet. Our circuit seems to work just like the evaluation module with one exception.
On the EVM, even when open circuit, the LED's indicate that the system is in "Pre-charge qualification". With our version of the circuit, the LED's are indicating "Battery absent or over-voltage fault". While I think that our version of the circuit is behaving "correctly", we were expecting the behavior to be identical to the evaluation module.
We are using the charger to charge an A123 battery, This battery is a lithium battery designed as a "drop in" replacement for a lead acid battery. However, when the A123 is depleted beyond a certain point, its on board electronics cause it to go open circuit. This open circuit is reset when charging voltage is present. The evaluation board charges the battery in this condition without difficulty.
Any help in understanding this behavior would be greatly appreciated.
Mike