9.3.10.1.2 Analog Undervoltage

The TAS2555 device has an integrated undervoltage protection on the analog power supply lines AVDD and VBAT. The undervoltage limit fault is triggered when AVDD is less than 1.5 V or when VBAT is less than 2.4 V. Once the fault is detected the TAS2555 device will disable the audio channel and power down the Class-D amplifier. When an under-voltage event occurs, a status flag at B0_P0_R104[6] is set. This register is sticky and the bit will remain high for as long as it is not read, or the device is not reset. The undervoltage event can also be used to generate an interrupt if required. Refer to IRQs and Flags section for more details. To re-enable the audio channel after a fault the Class-D must be re-enabled by setting B0_P0_R5[7]=1. All other configurations are preserved and the audio channel will power up with the last configured settings.