Usb Interface - Quectel SC262R Series Hardware Design

batteries, you should modify the charging and discharging curve correspondingly to achieve the best
performance.
If the thermistor is not available in the battery, or an adapter is utilized to power the module, you must
connect BAT_THERM to GND via a 47 kΩ resistor. Otherwise, the system may mistakenly judge that the
battery temperature is abnormal, and therefore cause battery charging failure.
BAT_SNS must be connected. Otherwise, the module will have abnormalities in voltage detection, as well
as associated problems with power-on/off and battery charging/discharging.

3.9. USB Interface

SC262R 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 9: 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.
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 (+)
DI USB ID detect
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.
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