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FIBOCOM SU806 Series Hardware Guide
Page 53 of 86
3.19
Audio
3.19.1
Audio Interface Pin Definition
SU806D-EAU series module supports analog audio, have 3 input and 3 output. Pin definition is shown in
the following table:
Table 3-25 Audio interface pin definition
Pin Name
Pin
Number
I/O
Description
Note
SPK_P
10
AO
Speaker amp+ output
Power consumption
800mW in 8Ω load
SPK_M
11
AO
Speaker amp- output
EAR_P
8
AO
Earpiece
Power consumption
25
mW in 32Ω load
EAR_M
9
AO
Earpiece output-
HPH_L
138
AO
Headset left channel output
-
HPH_GND
137
AI
Headset ground sensing
-
HPH_R
136
AO
Headset right channel output
-
HPH_DET
139
AI
Headset detection
-
MIC2_P
6
AI
Headset mic input
-
MIC1_M
5
AI
Main mic difference input-
-
MIC1_P
4
AI
Main mic difference input+
-
MIC3_P
220
AI
Sub-mic input
-
Design notice:
1) SU806D-EAU series module has MIC bias circuit internally, and no external addition is required.
2) The SPK is configured as class D amplifier output, cannot connect with amplifier externally, it is
recommended to connect 8Ω speakers. Note that the route width must meet the power rating
requirements; If an external audio amplifier is required, please use the output of headphone as the
input of external audio amplifier.
3) The reference ground of the headphone has already grounded in the module. The external circuit is
recommended not to be grounded and resistor can be reserved.
4) It is recommended to use earpiece with 32Ω impendence.
