This active-low output pin reports audio clipping, overtemperature warnings,overcurrent limit warnings and POR events.

Clipping is reported if any channel is at the maximum modulation for 20 consecutive PWM clocks (default value) which results in a 10-µs delay to report the onset of clipping. Changing the number of required consecutive PWM clocks in the Clip Window Register (address = 0x23) impacts the report delay time. The Clip Detect Warning bit is sticky in latching mode and can be cleared by the CLEAR FAULT bit (bit 7) in register 0x21.

An overtemperature warning (OTW) is reported if the general temperature or any of the channel temperature warnings are set. The warning temperature can be set through bits 5 and 6 in Miscellaneous Control 1 Register (address = 0x01).

Register bits are available to mask either clipping, OTW or I_LIMIT reporting to the pin. These bits only mask the setting of the pin and do not affect the register reporting. By default both clipping, I_LIMIT and OTW are reported.

The WARN pin is latched and can be cleared by writing the CLEAR FAULT bit (bit 7) in register 0x21.

This pin is an open-drain output with an internal 100 kΩ pull-up resistor to VDD.