After power-on, all registers are set to the power-on default values. The device does not perform any monitoring functions until the START bit of Configuration Register 1 is set ('1'). No detections are executed until the first monitoring cycle is completed, and all measurement data registers (such as remote and local temp-data registers and the TACH data register) are updated with the new measured value. No interrupt signals are generated until the first cycle of monitoring and detection is completed. This process avoids any false alarms caused by the power-on default setting.

After power-on, the fan spin-up process is performed. At the end of spin-up, the duty cycle of the PWM driver is adjusted to 33%. (Refer to the Fan Spin-Up section for details). Device status after software reset is similar to power-on reset.