LTE Module Series
Smart EVB User Guide
Smart_EVB_User_Guide Confidential / Released 15 / 29
Table 4: Pin Assignment of USB Device Interface J602
3.3. Audio Interface
Smart module provides a digital audio interface (PCM). The analog interface J702 on the Smart EVB is
used for loud speaker, earphone and microphone.
3.3.1. Loud Speaker
Loud speaker is soldered via TP701 and TP702. The following figure shows the loud speaker circuit.
SPK_P
SPK_N
10pF
10pF
33pF
33pF
Close to speaker
GND
GND
ESD
ESD
FB
FB
Smart EVB
Figure 7: Loud Speaker Circuit
J602
Pin Name
Function
1
USB_VBUS
This pin is used for USB detection and power supply.
2
USB_DM
USB serial differential bus (minus)
3
USB_DP
USB serial differential bus (positive)
4
USB_ID
USB serial ID signal
5
GND
GND for USB interface
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