Smart LTE Module Series
Smart EVB User Guide
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Table 5: Pin Assignment of Micro USB Interface
The USB_DP and USB_DM data lines are connected directly to the module.
3.7. Audio Interfaces (J702)
Smart EVB provides four audio interfaces, including loudspeaker, headphone, earphone and microphone
interfaces.
3.7.1. Loudspeaker Interface
Loudspeaker is soldered onto the Smart EVB via TP701 and TP702. The following figure shows the
reference circuit design for loudspeaker interface.
SPK_P
SPK_N
1 nF
1 nF
Close to speaker
GND
GND
ESD
FB
FB
Smart EVB
ESD
Figure 17: Reference Circuit Design for Loudspeaker Interface
Pin No.
Pin Name
Description
1
USB_VBUS
Used for USB detection and power supply of OTG equipment
2
USB_DM
USB serial differential bus (minus)
3
USB_DP
USB serial differential bus (plus)
4
USB_ID
USB serial ID signal
5
GND
GND for USB interface
NOTE
