Smart Module Series
SC690A_Series_Hardware_Design 23 / 105
It is suggested to
use a TVS to
increase voltage
surge withstand
capability.
LDO9_1V8
9
PO
1.8 V output
Vnom = 1.8 V
I
O
max = 300 mA
Power supply for
external GPIO’s
pull up circuits and
level shift circuit.
VPH_PWR
220, 221
PO
Power supply for
peripherals
Vmax = 4.4 V
Vmin = 3.55 V
Vnom = 3.8 V
VRTC
16
PIO
Power supply for
RTC
Vmax = 3.2 V
V
I
= 2.0
–3.25 V
GND
3, 4, 18, 20, 31, 34, 35, 40, 43, 47, 56, 62, 87, 98, 101, 112, 125, 128,130, 133,
135, 148, 150, 159, 160, 163, 170, 173, 176, 182, 193, 195, 219, 227, 243, 257
–
323
Analog Audio Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
MIC_BIAS1
44
AO
Microphone bias
output voltage 1
Vmin = 1.0 V
Vmax = 2.85 V
MIC_BIAS2
233
AO
Microphone bias
output voltage 2
MIC_BIAS3
167
AO
Microphone bias
output voltage 3
MIC1_P
218
AI
Microphone input
for channel 1 (+)
MIC1_M
217
AI
Microphone input
for channel 1 (-)
MIC2_P
216
AI
Microphone input
for channel 2 (+)
Used for headset
mic by default.
MIC2_M
215
AI
Microphone input
for channel 2 (-)
MIC3_P
214
AI
Microphone input
for channel 3 (+)
MIC3_M
213
AI
Microphone input
for channel 3 (-)
EAR_P
53
AO
Earpiece output (+)
EAR_M
52
AO
Earpiece output (-)
LINE_OUT_P
181
AO
Aux amplifier output
(+)
