Interface Applications; Power Interface (J201/J801) - Quectel UMTS Module Series User Manual

4

Interface Applications

This chapter describes the hardware interfaces of UMTS&LTE EVB, shown as follows:

Power interface

UMTS&LTE TE-A interface

Wi-Fi & Ethernet TE-A interface

USB interface

Audio interfaces

(U)SIM interface

SD card interface

UART interfaces
It also provides information about the buttons, switch, status indication LEDs and test points to help
customers use the UMTS&LTE EVB.

4.1. Power Interface (J201/J801)

The UMTS&LTE EVB can be powered by an external power adapter through connecting with the power
jack (J201) or USB receptacle (J801) on the EVB. The power adapter connects to a step-down converter
which can provide the supply voltage (VBAT) required for operating the EVB and the module.
The following two figures show the simplified power supply schematic and the power interface of Quectel
UMTS&LTE EVB.
J801
USB
interface
J201
Power
supply
UMTS&LTE_EVB_User_Guide
U301
LDO
S201
U303
LDO
Power
U201
switch
TPS54319
Step-down converter
Figure 5: Power Supply for UMTS&LTE EVB
UMTS/HSPA/LTE Module Series
UMTS&LTE EVB User Guide
1.8V
Power supply for
Wi-Fi module
3.3V 2.85V
U302
LDO
J103
VBAT
Power supply for
SD Card
Power supply for
UMTS&LTE module
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