Product Info

Smart LTE Module Series
SC66 Hardware Design
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3.9. USB Interface
SC66 provides two USB interfaces,The interface is compatible with the USB 3.1/2.0 specification, and
can be used for USB OTG,TYPE-C,DP function. USB 3.1 has a maximum speed of 10Gbps, USB 2.0
supports up to 480Mbps with full speed (12Mbps) down compatibility. USB interface can be used for AT
command transmission, data transmission, software debugging and software upgrading.
SC66 also supports USB on-go(OTG) function. CC1 pin is used to detect whether the OTG device is
connected or not. CC1 is opened by default and high level is maintained. If a slave device is inserted,
CC1 will be pulled down and SC66 will be configured as host mode.
3.9.1. TYPE-C Interfaces
The TYPE-C interface has one set of usb2.0-compatible HS interfaces (USB1_HS_DP/M), and two
sets of SS interfaces that support USB3.1 (USB_SS1_RXP/M,USB_SS1_TXP/M&
USB_SS2_RXP/M,USB_SS2_TXP/M).
When TYPE-C is forward inserted, USB_CC1 detects the external device, and the data is transmitted
through USB_SS1;Conversely, when TYPE-C is inverted, USB_CC2 detects the external device, and the
data is transmitted through USB_SS2.
The following table shows the pin definition of USB interface.
Table 12: Pin Definition of USB Interface
Pin Name
Pin No.
I/O
Description
Comment
USB_VBUS
41，42
PI/PO
Charging power input.
Power supply output for OTG
device.
USB/Charger insertion detection.
Vnorm=5.0V
USB1_HS_DM
33
IO
USB 2.0 differential data
Requires 90R
differential routing
USB1_HS_DP
32
IO
USB_SS1_RX_P
171
AI
USB 3.1 channel1 differential data
USB_SS1_RX_M
172
AI
USB_SS1_TX_P
174
AO
USB_SS1_TX_M
175
AO
USB_SS2_RX_M
161
AI
USB 3.1 channel2 differential data