SLASEC2B November 2016 – February 2019 TAS2557
The TAS2557 has 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 TAS2557 will disable the audio channel and power down the Class-D amplifier. When an under-voltage event occurs, a status flag INT_UV is set. This register is sticky and the bit will remain high until the bit is read or the device is 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 PWR_SPK high. All other configurations are preserved and the audio channel will power up with the last configured settings.