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BQ24072: the device cant charge for single li-ion

Part Number: BQ24072

dear TI guys,

my customer use bq24072  occur the following issue:

follow the typical application of  the datasheet,my customer design a circuit board,when the vin =5v,the EN2=high,EN1=low,the   Iin  current is about 20mA, the device  seems  not to work。

i check the OVP,UVLO and  output limited current,they are all ok。but when i test the voltage of the TS pin by the multimeter ,the device begin to charge ,when i take away the probe,the device return the befor status(cant charge)。the application schematic as below ,

can you tell me why occur such case and how should i resolve the issue?