Interface Application; Power Supply Interfaces (S801/S803) - Quectel Smart EVB User Manual

3
Interface Applications
This chapter describes the hardware interfaces of Smart EVB, shown as follows:
⚫
Power supply interfaces
⚫
Touch panel interface
⚫
LCM interface
⚫
Camera interfaces
⚫
SD card interface
⚫
USB interface
⚫
Audio interfaces
⚫
(U)SIM interfaces
⚫
UART interfaces
It also provides information about LEDs, buttons, test points, flashlight, vibrator and sensors to help
customers use the Smart EVB.

3.1. Power Supply Interfaces (S801/S803)

The Smart EVB can be powered by an external 5.0V DC power adapter. Connect the DC power adapter
to the DC interface (J807) and then the step-down converter (DC-to-DC converter), which is used to
provide the supply voltage required for operating the module.
A separate battery interface (J801) is provided, in case there are no other power options available. The
following figures show the simplified power supply block diagram and power supply interfaces of Smart
EVB.
J807
DC
interface
Figure 5: Simplified Power Supply Schematic of Smart EVB
Smart_ EVB_User_Guide
U801
DC-to-DC
Step-down converter
Power switch
J801
VBAT
interface
S801 S803
Power ON/OFF
Smart LTE Module Series
Smart EVB User Guide
Power supply for
Smart modules
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