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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 40 / 82

TXS0108PWR

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

VCCA

Module

GND GND

VDD_EXT VCCB

3.3V

DIN1

ROUT3

ROUT2

ROUT1

DIN4

DIN3

DIN2

DIN5

R1OUTB

FORCEON

/FORCEOFF

/INVALID

3.3V

DOUT1

DOUT2

DOUT3

DOUT4

DOUT5

RIN3

RIN2

RIN1

VCC GND

SN65C3238

DB-9

Connect to PC

DCD

RTS

DTR

TXD

CTS

RXD

DSR

GND

Figure 21: RS232 Level Match Circuit

1. The module disables the hardware flow control by default. When hardware flow control is required,

RTS and CTS should be connected to the host. AT command AT+IFC=2,2 is used to enable

hardware flow control. AT command AT+IFC=0,0 is used to disable the hardware flow control. For

more details, please refer to document [1].

2. Rising edge on DTR will let the module exit from the data mode by default. It can be disabled by AT

commands. Refer to document [1] about the command AT&D and AT&V for details.

3. DCD is used as data mode indication. Refer to document [1] about the command AT&C and AT&V

for details.

3.11. USIM Card Interface

The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and

3.0V USIM cards are supported.

Table 12: Pin Definition of the USIM Interface

Pin Name

Pin No.

I/O

Description

Comment

USIM_VDD

Power supply for USIM card.

Either 1.8V or 3.0V is supported

by the module automatically.

USIM_DATA

Data signal of USIM card.

Pull-up to USIM_VDD with 15k

resistor internally.

NOTES

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