Audio Interface - Quectel UC20 User Manual

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UC20 EVB provides a Micro-USB receptacle J601 to connect a host device. The USB data lines USB_DP
and USB_DM are connected directly to the UC20-TE-A and UC20 Mini PCIe.
Table 4: Pin Assignment of USB Device Interface J601
J601 Pin Pin Name
1 USB_VBUS
2 USB_DM
3 USB_DP
4 USB_ID
5 GND

3.3. Audio Interface

UC20-TE-A and UC20 Mini PCIe just provide digital audio interface (PCM). UC20 EVB equips an external
audio codec called NAU8814. Figure 8 shows the audio codec circuit.
The UC20 EVB provides three analog audio interfaces J402, J404, J401. This chapter gives a detailed
introduction on these analog audio interfaces.
UC20_EVB_User_Guide
Figure 7: Circuit of USB Interface
Function
This pin is used for USB detection.
USB serial differential bus (minus).
USB serial differential bus (positive).
Reserved.
GND for USB interface.
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