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AMC6821: AMC6821 Register configuration

Part Number: AMC6821

Hi ,

I am using AMC6821 Part for one of Fan control application. I  have interfaced this FAN controller with PIC micro controller for I2C Interface.

I am trying to run the controller in Software Duty cycle Mode  and below are the register Setting i have used. 

when i set these registers PWM pulse is coming from the PWM out pin and stopped within shorter period of time.  is there any sequence i need to follow to run in PWM mode.