Smart Module Series
SC200K_Series_Hardware_Design 21 / 105
221, 222, 223, 224, 226, 227, 228, 229, 230, 231, 233,
234, 235, 236, 237, 238, 240, 241, 243, 244, 245, 247,
248, 250, 251, 255, 256, 258, 259, 261, 266, 268, 269,
271, 272, 273, 274
Audio Interfaces
Pin Name
Pin
No.
I/O
Description
DC
Characteristics
Comment
MIC1_P
4
AI
Main microphone
input (+)
MIC1_M
5
AI
Main microphone
input (-)
MIC2_P
6
AI
Microphone input for
headset (+)
EAR_P
8
AO
Earpiece output (+)
EAR_M
9
AO
Earpiece output (-)
SPK_P
10
AO
Loudspeaker output
(+)
SPK_M
11
AO
Loudspeaker output
(-)
HPH_R
136
AO
Headphone right
channel output
HPH_GND
137
AO
Headphone reference
ground
If unused, needs to be
grounded.
HPH_L
138
AO
Headphone left
channel output
HS_DET
139
AI
Headset hot-plug
detect
High level by default.
MIC_BIAS
147
PO
Bias voltage output
for microphone
Vmin = 2.20 V
Vmax = 3.00 V
Vnom = 2.50 V
MIC3_P
148
AI
Auxiliary microphone
input (+)
MIC3_M
149
AI
Auxiliary microphone
input (-)
Keypad/Turn-on/off Interfaces
Pin Name
Pin
No.
I/O
Description
DC
Characteristics
Comment
PWRKEY
114
DI
Turn on/off the
module
V
IL
max = 0.60 V
V
IH
min = 1.30 V
Active low.
Pulled up to VBAT
internally.
