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TPS2HB16-Q1: Sampling error when switching channels

Part Number: TPS2HB16-Q1

Current Configuration:

EN1=1,EN2=0,SEL1=0 ,DIA_EN=3.3V, Channel1 OL,Channel 2 OL

Ideally, when SEL2=0, Vsns≈0, and when SEL2=1, Vsns=Isnsfh*Rsns≈5V. However, we observed that the voltage at the SNS point takes about 4ms to change to 5V when SEL1 switches from 0 to 1, and quickly changes from 5V to 0V when SEL1 switches from 1 to 0. Why is this? What is the chip doing in these 4ms? How can we set the switching time of SEL1 and the sampling time of SNS to ensure that the correct voltages of the two channels are read?

The yellow line is SEL2, and the blue line is the voltage on Rsns