Quectel SC20 Series - Page 27

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