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BQ25121: Shipmode function is not working in fault status

Part Number: BQ25121

Hi,

I have a question. When Vin is below 4.5V, status become fault.In these cases, Shipmode setting is not working. Only after Vin is upper 4.8V and charging, shipmode is working.

This happens when we put our wearable device into its charger. When connecting there are some short spikes on Vin (USB power) and the PMIC wrong behaviour is relatively frequent. 

This situation is normal in BQ25121?I hope there is any solution for that.

I find that someone have meet the same question,but no answered.Please help to take a look again.

THANKS!