TAS5828M not only provides PVDD Undervoltage Shutdown protection, but also optional PVDD drop detection. Based on internal PVDD real-time sensing voltage, TAS5828M is able to be configured to expected behavior, which could toggle pin10 PD_DET from high to low to indicate PVDD drops below specific level (default 8 V), and whether TAS5828M automatically goes into Hiz mode to shutdown audio output. All these settings is accessible through Register 0x04h and 0x05h.

The purpose is to feedback PVDD voltage drop information through GPIO to user product control system, which is able to implement flexible protection strategy. For example, SOC could starts audio volume fade out process once PD_DET pin goes to low. This process could provide effective pop-click free control shutdown.