9.3.10.2 Brownout

The TAS2555 device has an integrated brownout system to shutdown the device when the battery voltage drops to an insufficient level. This user configurable level can be set under Device Control in the PurePath Console 3 Software TAS2555 Application. When brownout event occurs a status flag B0_P0_R104[3] is set. This register is sticky and the bit remains high for as long as it is not read, or the device is not reset. The brownout event can also be used to generate an interrupt if required. Refer to IRQs and Flags section for more details. Once the battery voltage drops below the defined threshold the following actions occur.

• The audio playback is muted in a graceful soft-stepping manner
• DSP, clock dividers, and analog blocks are powered down. B0_P0_R4[7:3]=00000 and B0_P0_R5[7:0]=0x00
• Sticky bit B0_P0_R104[3] is set

Once the host is aware of the brownout it should write B0_P0_R4[0] =0 to put the TAS2555 device in software shutdown and enter low power mode. Once the battery supply is stable above the defined brownout threshold the host can re-enable the device using the Power Control Registers B0_P0_R4 and B0_P0_R5.