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UMTS/HSPA

UC20 EVB User Guide

UC20_EVB_User_Guide Confidential / Released 19 / 25

3.5. RS-232 Interface

UC20 EVB_V1.01 offers two RS-232 interfaces: COM1 (MAIN UART) and COM2. COM2 is reserved.

The serial interface COM1 of the UC20 EVB_V1.01 is intended for the communication between UC20

module and the host application. The interface is a data and control interface for transmitting data and AT

command.

Module

Level Shifter

DB9

Connector

UART Port

Figure 9: UART Block Diagram

Figure 10 shows the reference design of RS-233 level shifter.

GNDTO PC serial port

SP3238

GND

T5OU T

/SHUTDOWN

V+

GND

V-

VCC

T4OU T

T2OU T

T3OU T

T1OU T

R3IN

R2IN

R1IN

/STATUS

3V ONLINE

R1OUT

R2OUT

R3OUT

/R1OUT

GND T5IN

T4IN

T3IN

T2IN

T1IN

C 2+

C 2-

C 1-

C 1+

MODULE

RXD

DTR

RTS

CTS

TXD

DCD

Voltage Level

Translator

DCD_3.3V

RTS_3.3V

DTR_3.3V

RXD_3.3V

RI_3.3V

CTS_3.3V

TXD_3.3V

DCD

RTS

DTR

RXD

CTS

TXD

DCD_1.8V

RTS_1.8V

DTR_1.8V

RXD_1.8V

RI_1.8V

CTS_1.8V

TXD_1.8V

3.3V

VCCA

Module

GND

1.8V

VCCB

3.3V

Figure 10: Level Match Circuit

Quectel

Confidential

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