Smart LTE Module Series
Smart EVB G2 User Guide
Smart_EVB_G2_User_Guide 40 / 59
Table 8: Pin Definition of Headset Interface
The following figure shows the sketch design of audio plug which suits for the audio jack on Smart EVB
G2.
2
1
MIC
GND
SW
SPK_R
SPK_L
3
4
32
Ω
32
Ω
HS_DET
5
Figure 29: Sketch of Audio Plug
4.7.3. Earphone Interface
Smart EVB G2 provides one earphone interface and the earphone is soldered onto the Smart EVB G2 via
test point J1204. The following figure shows a reference circuit design for earphone interface.
ESD
ESD
100pF
EAR_P
EAR_N
FB
Smart EVB G2
Earphone
33pF
33pF
J1204
Figure 30: Reference Design for Earphone Interface
Pin No.
Pin Name
Function
1
MIC
Positive microphone input
2
GND
Dedicated GND for audio
3
R-AUDIO
Headset right channel
4
DETECT
Headset detection
5
L-AUDIO
Headset left channel
6
GND
Ground
