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3.9. USB Interface
SC650T provides one integrated Universal Serial Bus (USB) interface which complies with the USB
3.0/2.0 specifications and supports super speed (5Gbps) on USB 3.0, high speed (480Mbps) on USB 2.0
and full speed (12Mbps) modes. The USB interface supports USB OTG function, and is used for AT
command communication, data transmission, software debugging and firmware upgrade.
The following table shows the pin definition of USB interface.
Table 8: Pin Definition of USB Interface
Pin Name
Pin No.
USB_VBUS
41, 42
USB_DM
33
USB_DP
32
USB_SS_RX_P
171
USB_SS_RX_M
172
USB_SS_TX_P
174
USB_SS_TX_M
175
USBC_CC2
223
USBC_CC1
224
CC_OUT
225
USB_VBUS can be powered by USB power or adapter. It is used for USB connection detection and
power supply input for battery charging. Its input voltage ranges from 4.0V to 10.0V, and the typical value
is 5.0V. SC650T module supports charging management for a single cell Li-ion battery, but varied
charging parameters should be set for batteries with varied models or capacities. The maximum charging
current is up to 3.0A.
The module also supports USB On-The-Go (OTG) function, through using USB_ID pin to detect whether
SC650T_Hardware_Design
I/O
Charging power input;
Power supply output for OTG
PI/PO
device;
USB/charger insertion
detection.
USB 2.0 USB differential data
IO
bus (minus)
USB 2.0 USB differential data
IO
bus (plus)
USB 3.0 differential receive
AI
(plus)
USB 3.0 differential receive
AI
(minus)
USB 3.0 differential transmit
AO
(plus)
USB 3.0 differential transmit
AO
(minus)
USB Type-C control
AI/AO
configuration channel 2
USB Type-C control
AI/AO
configuration channel 1
DO
USB Type-C switch control
Smart LTE Module Series
SC650T Hardware Design
Description
Vmax=10V
Vmin=4V
Vnorm=5.0V
Require differential
impedance of 90Ω
Require differential
impedance of 90Ω
Micro USB mode is USB_ID
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