Another question, I used OPAMP module for current sample. If I implement OPAMP_Sleep() before enter into deep sleep mode and execute OPAMP_Wakeup() after WDT wakeup, I found the adc channel for the OPAMP can't read any value, the value was always zero, what's wrong with my design?
The Sleep() and Wakup() APIs save or restore the current state of the components which could have been modified by the program before they call the Stop() or Start() functions. The current consumption does not differ between the two methods.
I cannot tell what your issue with ADC might be. When you post your complete project, we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.
Can you please attach the project here. Can you create the technical support case by cypress.com-> Design support -> Create a support case to create the technical support case.