User Guide

NEM-2

System Module and User Interface CCS Technical Documentation

Audio Player

Audio Player power supply module consist of three different regulators, SMPS type for

DSP core supply with different output voltages, 3.3V LDO type for peripherals and analog

audio supply and 3.3V LDO type for MMC.

Audio Player power supply is controlled by DCT4 Phone part via dedicated hardware sig-

nal AudioPlayerPwrEnable. Two supply voltages AudioPlayerVCore and AudioPlayerVDD

are generated inside this block. Refer to chapter Phone- Audio Player Interface (MADI)

for further hardware implementation details.

Audio Player DSP core voltage regulator is dual mode (LDO/ SMPS) type. For SMPS mode

external synchronization frequency is needed. ADSP TOUT0 is used for that purpose. The

ADSP controls AudioPlayerVCore regulator output voltage via GPIO. Therefore ADSP is

able to set his core voltage according to the DSP frequency.

ADSP GPIO controls MMC supply voltage regulator.

AudioPlayerVDD will drop below typical value (3.3V) if battery is discharged. This causes

some audio performance loss. Digital part is not affected by this supply voltage drop.

Detailed Audio Player supply voltage distribution diagram is shown in figure below.