MS6821
MOSA
4 Stereo inputs / 2W PA output integrated Audio DAC and Volume Control
Output mode operation -- SE mode and BTL mode
Theꢀoutputꢀmodeꢀhasꢀtwoꢀmodes,ꢀSEꢀmodeꢀandꢀBTLꢀmode.ꢀTheꢀmodeꢀisꢀselectedꢀbyꢀI2CꢀcodeꢀviaꢀaꢀMCU.ꢀ
InꢀBTLꢀmode,ꢀtheꢀoutputsꢀofꢀA1(B1)ꢀandꢀA2(B2)ꢀareꢀthenꢀusedꢀtoꢀdriveꢀtheꢀbridgedꢂtiedꢀloadꢀ
ꢀ
A1
OUTRꢁ
ꢁ1
RL
4Ωꢀ/ꢀ8Ω
A2
ꢁ1
OUTR+
OUTLꢁ
B1
ꢁ1
RL
4Ωꢀ/ꢀ8Ω
B2
ꢁ1
OUTL+
I2C
Interface
SCL SDA
ꢀ
InꢀtheꢀSEꢀmode,ꢀtheꢀamplifiersꢀA2ꢀandꢀB2ꢀareꢀshutdown,ꢀandꢀthenꢀtheꢀamplifiersꢀwillꢀbeꢀaꢀhighꢀoutputꢀimpedanceꢀstate.ꢀ
ꢀ
ꢀ
ꢀ
Headphone
Jack
A1
ꢁ1
100uF
1k
OUTRꢁ
RL
16Ωꢀ/ꢀ32Ω
A2
Shu1tdown
B1
ꢁ1
100uF
1k
OUTLꢁ
B2
Shu1tdown
I2C
Interface
SCL SDA
ꢀ
ꢀ
ꢀ
ꢀ
Headphone sense
TheꢀoutputꢀmodeꢀisꢀSEꢀorꢀBTLꢀthatꢀisꢀdecidedꢀbyꢀaꢀheadphone.ꢀItꢀhasꢀtoꢀbeꢀsetꢀSEꢀmodeꢀwhenꢀaꢀheadphoneꢀisꢀplugꢂinꢀ
status.ꢀTheꢀoutputꢀmodeꢀisꢀselectedꢀbyꢀI2CꢀcommandꢀcodeꢀbyꢀaꢀMCU.ꢀPleaseꢀnoteꢀthatꢀtheꢀMS6821ꢀdon’tꢀdetectꢀaꢀ
headphoneꢀautomatically.ꢀThusꢀaꢀdetectꢀfunctionꢀisꢀexecutedꢀviaꢀaꢀMCU.ꢀAnꢀoperationꢀdiagramꢀisꢀasꢀfollows:ꢀ
ꢀ
VDD
MS6821
100k
27
SCL
100k
MCU
28
SDA
1uF
HP_sense
100uF
20
OUTLꢁ
RL
8Ω
1k
1k
18
OUTL+
HeadphoneꢀJack
100uF
9
OUTRꢁ
OUTR+
RL
8Ω
11
ꢀ
ꢀ
TheꢀHP_senseꢀpinꢀisꢀhighꢀwhenꢀaꢀheadphoneꢀisꢀplugꢂin.ꢀ
TheꢀHP_senseꢀpinꢀisꢀlowꢀwhenꢀaꢀheadphoneꢀisꢀnotꢀplugꢂin.ꢀ
REVꢀ 1.0
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MOSA [ MOSA ELECTRONICS ]
