Revised Date:

March 20, 2012

ds_pl2303HXD_v1.4.4

PL-2303HX (Rev D) Product Datasheet

- 13 -

Document Version 1.4.4

5.0 Pin Assignment & Description

Pin Type Abbreviation:

I: Input

O: Output

B: Bidirectional I/O

P: Power/Ground

5.1

SSOP28 Package

Table 5-1 Pin Assignment & Description (SSOP28)

Pin # Name

Type

Description

1

TXD

O

(1)

Serial Port (Transmitted Data)

2

DTR_N

O

(1)

Serial Port (Data Terminal Ready)

3

RTS_N

O

(1)

Serial Port (Request To Send)

4

VDD_325

P

RS232 VDD. The power pin for the serial port signals. When

the serial port is 3.3V, this should be 3.3V. When the serial port

is 2.5V, this should be 2.5V. The range can be from 1.8V~3.3V.

5

RXD

I

(2)

Serial Port (Received Data)

6

RI_N

B

(2)

Serial Port (Ring Indicator); or Auxiliary General Purpose I/O

Port when enabled

7

GND

P

Ground

8

NC

-

No Connection

9

DSR_N

B

(2)

Serial Port (Data Set Ready); or Auxiliary General Purpose I/O

Port when enabled

10

DCD_N

B

(2)

Serial Port (Data Carrier Detect); or Auxiliary General Purpose

I/O Port when enabled

11

CTS_N

B

(2)

Serial Port (Clear to Send); or Auxiliary General Purpose I/O

Port when enabled

12

SHTD_N

O

(3)

RS232 Transceiver Shut Down Control

13

GP3

I/O

Auxiliary GPIO Pin 3 (Default output high mode)

(6)

14

GP2

I/O

Auxiliary GPIO Pin 2 (Default output high mode)

(6)

15

DP

B

USB Port D+ signal

16

DM

B

USB Port D- signal

17

VO_33

P

Regulator Power Output, 3.3V

18

GND

P

Ground

19

RESET_N

I

(4)

External System Reset (Active Low)

20

VDD_5

P

21

NC

-

No Connection

22

GP0

B

(5)

General Purpose I/O Pin 0

23

GP1

B

(5)

General Purpose I/O Pin 1

24

NC

-

No Connection

25

GND

-

Ground

26

TEST

I

Test mode control

27

NC

-

No Connection

28

Reserved

-

Reserved pin (Must be floating)

Notes:

(1)

– Tri-State, Output Pad. Level and Driving Capability decided by VDD_325.

(2)

– Tri-State, CMOS Input/Output Pad with level shifter. Level and Driving Capability decided by VDD_325.

(3)

– CMOS Output Pad.

(4)

– CMOS Input Pad, 5V tolerant.

(5)

– Tri-State, CMOS Input/Output Pad. (Default mode: Input)

(6)

– Default output high mode; do not connect to ground.

(7)

– Enabling Auxiliary GPIO requires special customized driver.