Atmel AT83SND2C MP3 manual 50

Protocol Frame Description

Table 5-53 .AUDIO_SET_GAIN parameter

		Corresponding Register in
Gain Selector	Gain Value	datasheet
	00000000b => 0 dB
Line Out Gain	...
	00000010b => -3 dB	LLOG, RLOG
00h
	...
	00100000b => mute
	00000000b => -22 dB
	00000001b => + 20 dB
	...
Power Amplifier Gain	00001000b => -1 dB	APAGAIN
01h	00001011b => -10 dB
	...
	00001111b => -22 dB
	00000000b => +20 dB
	...
Line In Gain	00000101b => 0 dB
	...	RLIG, LLIG
02h
	00001100b => -3 dB
	...
	00010001b => mute
	00000000b => +20 dB
	...
Aux In Gain	00000101b => 0 dB
	...	AUXG
03h
	00001100b => -3 dB
	...
	00010001b => mute
	00000000b => +12 dB
	...
DAC Master Gain	00001000b => 0 dB
	...	RMPG, LMPG
04h
	00001010b => -3 dB
	...
	00100000b => mute

Note: All audio gain value are described in AT83SND2CMP3 datasheet. Refer to register description for more details.

Player response to AUDIO_SET_GAIN is SYSTEM_ACK.

DAC Master Gain parameter can also be updated with :

„SYSTEM_VOLUME_UP command,

„SYSTEM_VOLUME_DOWN command.

Note: Player response to SYSTEM_VOLUME_UP or SYSTEM_VOLUME_DOWN command is PLAYER_VOLUME* Response. DAC Master Gain is Byte 5 in PLAYER_VOLUME* response.

5-46 AT83SND2CMP3 User Guide

7525A–MP3–07/05