Product Info

Smart LTE Module Series
SC650T Hardware Design
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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.
I/O
Description
USB_VBUS
41, 42
PI/PO
Charging power input;
Power supply output for OTG
device;
USB/charger insertion
detection.
Vmax=10V
Vmin=4V
Vnorm=5.0V
USB_DM
33
IO
USB 2.0 USB differential data
bus (minus)
Require differential
impedance of 90Ω
USB_DP
32
IO
USB 2.0 USB differential data
bus (plus)
USB_SS_RX_P
171
AI
USB 3.0 differential receive
(plus)
Require differential
impedance of 90Ω
USB_SS_RX_M
172
AI
USB 3.0 differential receive
(minus)
USB_SS_TX_P
174
AO
USB 3.0 differential transmit
(plus)
USB_SS_TX_M
175
AO
USB 3.0 differential transmit
(minus)
USBC_CC2
223
AI/AO
USB Type-C control
configuration channel 2
USBC_CC1
224
AI/AO
USB Type-C control
configuration channel 1
Micro USB mode is USB_ID
CC_OUT
225
DO
USB Type-C switch control
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