Audio Interface - Quectel UC20 User Manual

UMTS&LTE EVB provides a Micro-USB receptacle J801 to connect a host device. The USB data lines
USB_DP and USB_DM are connected directly to the UMTS&LTE module.
Table 4: Pin Assignment of USB Device Interface J801
J601 Pin Pin Name
1 USB_VBUS
2 USB_DM
3 USB_DP
4 USB_ID
5 GND

3.3. Audio Interface

UMTS&LTE module provides digital audio interface (PCM). UMTS&LTE EVB is equipped with an external
audio codec called ALC5616. Figure 8 shows the audio codec circuit.
The UMTS&LTE EVB provides three analog audio interfaces J601, J602, J603. This chapter gives a
detailed introduction on these analog audio interfaces.
UMTS&LTE_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
Confidential / Released
UMTS/HSPA/LTE Module Series
UMTS&LTE EVB User Guide
15 / 32