Quectel SC20 Series Hardware Design page 27

SPKP
SPKN
HPH_R
HPH_GND
HPH_L
HS_DET
USB Interface
Pin Name
USB_VBUS
USB_DM
USB_DP
USB_ID
(U)SIM Interfaces
Pin Name
USIM2_DETECT
USIM2_RST
USIM2_CLK
SC20_Series_Hardware_Design
Speaker output
10 AO
(+)
11 AO Speaker output (-)
Headphone right
136 AO
channel output
Headphone
137 AI
reference ground
Headphone left
138 AO
channel output
Headset hot-plug
139 AI
detect
Pin
I/O Description
No.
USB 5 V power
141,
PI input and USB
142
insertion detection
USB 2.0
13 AIO
differential data (-)
USB 2.0
14 AIO differential data
(+)
16 AI USB ID detect
Pin
I/O Description
No.
(U)SIM2 card
17 DI
hot-plug detect
(U)SIM2 card
18 DO
reset
(U)SIM2 card
19 DO
clock
Smart Module Series
DC Characteristics Comment
Vmax = 6.3 V
Vmin = 4.35 V
Vnom = 5.0 V
DC Characteristics Comment
V max = 0.63 V
IL
V min = 1.17 V
IH
V max = 0.4 V
OL
V min =
OH
0.8 × USIM2_VDD
High level by
default.
Compliant with
USB 2.0 standard.
Require differential
impedance of 90 Ω.
High level by
default.
Active low.
Externally pull it up
to 1.8 V.
If unused, keep this
pin open.
26 / 133