Interface Application; Power Interface - Quectel SC20-CE User Manual

3

Interface Application

This chapter describes the hardware interfaces of Smart EVB, shown as follows:


Power interface

 USB interface
Audio interface

 USIM card interfaces
 UART interfaces
It also provides information about LEDs, buttons and test points to help customers use the Smart EVB.
3.1. Power Interface
The power supply of Smart EVB could come from the external input which is connected with USB
receptacle. The USB receptacle is connected with a step-down converter to provide the supply voltage
(VBAT) required for operating the module.
The following figures show the simplified power supply schematic and the power interface of Smart EVB.
J602
USB
interface
Step -
Smart_EVB_User_Guide
U801
DCDC
down converter
J801
VBAT
interface
Figure 4: Simplified Power Supply Schematic
Confidential / Released
S801 S803
Power switch Power ON/OFF
LTE Module Series
Smart EVB User Guide
Power supply to
the module
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