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AM2634: CMPSS example work abnormal

Part Number: AM2634

Tool/software:

I running the CMPSS example from SDK as below folder  mcu_plus_sdk_am263x_10_01_00_31\examples\drivers\cmpss\cmpss_asynchronous_trip\am263x-cc.

Because CMPSS negative input should be internal DAC 2048, I expect the CMPSS output should be 1 while positive input >1.65V and output 0 while positive input <1.65v. 

Then I try give voltage on HSEC pin15 (HSEC_ADC0_AIN2) which should be CMPSS positive input, and found actually only input voltage 0 then CMPSS output 0, otherwise CMPSS always output 1 while input voltage from 0.1~3.3V, this is abnormal than my expectation, could you please help verify the example code?