MS6821
MOSA
4 Stereo inputs / 2W PA output integrated Audio DAC and Volume Control
I2C CODE EXAMPLE
Input selector and input gain
ꢀ
Setꢀleftꢀchannelꢀtoꢀbeꢀlineꢂ4ꢀandꢀinputꢀgainꢀtoꢀbeꢀ3dB.ꢀSetꢀrightꢀchannelꢀtoꢀbeꢀlineꢂ4ꢀandꢀinputꢀgainꢀtoꢀbeꢀ3dB.ꢀ
Gain
0
Line
ACK
Start
MS6821ꢀAddress
ACK
1
0
0
0
1
1
1
ACK
1
0
1
0
0
1
1
1
Stop
Lꢁchꢀ=ꢀLine4,ꢀGꢀ=ꢀ3dB
Rꢁchꢀ=ꢀLine4,ꢀGꢀ=ꢀ3dB
Theꢀleftꢀandꢀrightꢀinputꢀchannelꢀareꢀindependent.ꢀ
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Volume control
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Setꢀleftꢀchannelꢀtoꢀbeꢀꢂ15dBꢀandꢀrightꢀchannelꢀtoꢀbeꢀ30dB.ꢀ
Gain
Line
ACK
Start
MS6821ꢀAddress
ACK
1
0
0
0
0
1
1
1
ACK
1
0
1
0
0
1
1
1
Stop
Lꢁchꢀ=ꢀLine4,ꢀGꢀ=ꢀ3dB
Rꢁchꢀ=ꢀLine4,ꢀGꢀ=ꢀ3dB
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Power down mode
SetꢀbuiltꢂinꢀDACꢀtoꢀbeꢀpowerꢀdownꢀmode.
DACPD
Start
MS6821ꢀAddress
ACK
1
1
0
1
0
0
0
0
ACK Stop
DACꢀpowerꢀdown
Output mode, mixer control and audio format
ꢀ
SetꢀoutputꢀmodeꢀtoꢀbeꢀSEꢀmode,ꢀaudioꢀformatꢀisꢀI2S,ꢀandꢀbothꢀinputꢀchannelꢀtoꢀbeꢀmixed.ꢀ
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Outputꢀmode
Mixer
Audioꢀformat
Start
MS6821ꢀAddress
ACK
1
1
1
1
1
1
0
1 ACK Stop
SEꢀmode,ꢀAllꢀmix,ꢀI2S
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xꢀ
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REVꢀ 1.0
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MOSA [ MOSA ELECTRONICS ]
