Interface Application; Power Interface - Quectel UC20 User Manual

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Interface Application

This chapter describes the hardware interfaces of UC20 EVB, shown as follows:


Power interface


USB interface

Audio interface

SIM card interface

UART interface
It also provides information about LEDs, buttons and test points to help you use the UC20 EVB.
3.1. Power Interface
The power supply of UC20 EVB could come from the external input which is connected with power jack
on the EVB board. The power jack not only connects a step-down converter which can provide the supply
voltage (VBAT) required for operating EVB and UC20-TE-A module, but also provides a correct voltage
(VDD_3.3) after a LDO power is supplied to UC20 Mini PCIe module.
Figure 4 shows the simplified power supply schematic, and Figure 5 shows the power interface of UC20
EVB.
MIC29302WU
J201
S201
Power Power
supply switch
UC20_EVB_User_Guide
U701
VDD_3.3
J702
LDO
U201
AAT2138
Step-down converter
Figure 4: Simplified Power Supply Schematic
Power supply to
UC20 Mini PCIe
Confidential / Released
UMTS/HSPA Module Series
UC20 EVB User Guide
1.8V
U202
LDO
3.3V
U203
LDO
Power supply to
VBAT
UC20-TE-A
J102
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