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3. TECHNICAL BRIEF
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In case of KE820/KG99 mass production, the JTAG & ETM interface connector will not be mount on
board. That is only for developing and software debugging purpose.( It will not be mounted on mass
production PCB)
3.13. Audio
KE820/KG99 Audio signal flow diagram as following diagram.
Figure 21 Audio signal flow diagram
Active
Mic.
DP
DT
BBP
PMB8876
EP
SCL SDA
A
MIC1
EP
FM
Si4701
Differential
Stereo/ Single ended
Stereo/ Single ended
Mono/ Differential
Amp
LM4845
Single End
MIC2
Audio
RX
FM
Radio
Audio
TX
Main PCB
Sub PCB
Receiver & Speaker
Stereo head set &
Microphone
FM Antenna
GPIO
Stereo/ Single ended
DP
DT
Stereo Diffential
SPK_RCV_SEL
FM_BBP_SEL
Single End
GPIO
18pin/ IO