We are using the comparator in the TPS65721 for battery detection and it works reliably unless the battery is completely dead. When it is dead, the comparator always returns a 1 to indicate it is below the threshold and never recovers, therefore making it appear to be detached. My question is, should I only check the comparator register if the battery is not in the pre-charge state? I am wondering if the battery test is not reliable while in the pre-charge state which is where it should be when completely dead after being plugged in. Also, is there any way to control when the battery detection test is done?
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