Usb Interface - Quectel SC200R Series Hardware Design

3.9. USB Interface

SC200R series module provides one integrated Universal Serial Bus (USB) interface which complies with
USB 2.0 specification and supports high-speed (480 Mbps) and full-speed (12 Mbps) modes. The USB
interface supports USB OTG 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 12: Pin Definition of USB Interface
Pin Name Pin No.
USB_VBUS 141, 142
USB_DM 13
USB_DP 14
USB_ID 16
For the design of USB 2.0 interface, it is recommended to connect USB_ID directly to the USB_ID pin of
the external USB port for USB ID detection. When you insert a device into the external USB port, the
USB_ID pin of the module will be pulled down to make the module enter host mode.
You can choose either to support USB OTG or not. The following figures show the reference designs.
USB_VBUS
USB_DM
USB_DP
Module
Figure 11: USB Interface Reference Design (OTG Not Supported)
SC200R&SC262R_Series_Hardware_Design
I/O Description
Charging power input;
PI USB 5 V power input;
USB/adaptor insertion detection
AIO USB 2.0 differential data (-)
AIO USB 2.0 differential data (+)
AI USB ID detect
C1
100 nF
GND
D1 D2 D3
ESD ESD ESD
Smart Module Series
Comment
Vmax = 6.2 V
Vmin = 4.35 V
Vnom = 5.0 V
USB 2.0 standard
compliant.
90 Ω differential
impedance.
High level by default.
1
VUSB
2
USB_DM
3
USB_DP
4
USB_ID
5
GND
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