bq40z50-R1 CTO:Suspend Threshold and CTO timer reset condition?

Hello Sean,

Here are my responses to your questions.

Q1:

Fast charging has two phase, CC and CV

In CV phase, the current() will decrease naturally, if the current() < CTO:Suspend Threshold, will CTO timer stop/suspend? Yes, the CTO timer starts counting when the current() > CTO: Charge Threshold and stops/suspend when current() < CTO: Suspend Threshold or CTO: Time > CTO: Delay.

Q2:

CTO timer only reset after trip ? Yes as TRM said

SafetyStatus()[CTO] = 1 AND (Discharge by an amount of CTO:Reset),

Will it also reset only Discharge by an amount of CTO:Reset even not trip for partial charge and discharge? I'm not sure I understand your question here. For CTO: Timer to reset it must first trip where CTO: Time > CTO: Delay. If it doesn't trip, it is still counting or is suspended due to current() < CTO:Suspend Threshold. Once CTO trips the CTO timer will reset with a discharge current() = CTO: Reset.