PL2303 英文资料 整理

PL-2303 USB to Serial RS232 Bridge Controller

Features

Full compliance with the USB Specification v1.1 and USB CDC v1.1 Support the RS232 Serial interface Support automatic handshake mode

Support Remote wake-up and power management

256 bytes buffer each for upstream and downstream data flow Support default ROM or external EEPROM for device configuration On chip USB transceiver

On chip crystal oscillator running at 12M Hz

Supports Windows 98/SE, ME, 2000, XP, Windows CE3.0, CE .NET, Linux, and Mac OS 28 Pins SOIC package

SSOP 28 PACKAGE (TOP VIEW)

Block Diagram

USB Port

USB Transceiver

REGISTER/

Control USB CONFIG/ Unit SIE STATUS/

CONTROL

DOWN UP

STREAM STREAM BUFFER BUFFER

CLOCK SYNTHESIZE

RS-232 SERIAL

INTERFACE OSCILLATOR EEPROM

INTERFACE

Serial Port I2C Bus

Overview

The PL-2303 operates as a bridge between one USB port and one standard RS232 Serial port. The two large on-chip buffers accommodate data flow from two different buses. The USB bulk-type data is adopted for maximum data transfer. Automatic handshake is supported at the Serial port. With these, a much higher baud rate can be achieved compared to the legacy UART controller. This device is also compliant with USB power management and remote wakeup scheme. Only minimum power is consumed from the host during Suspend. By integrating all the function in a SOIC-28 package, this chip is suitable for cable embedding. Users just simply hook the cable into PC or hub’s USB port, and then they can connect to any RS-232 devices.

Pin Description

Table 1. Pins Description

Pin No. 1 2 3 4 Name TXD DTR_N RTS_N VDD_232 Type O O O P Data output to Serial port Data Terminal Ready, active low Request To Send, active low RS-232 VDD. The RS-232 output signals (Pin 1 ~ Pin 3) are designed for 5V, 3.3V or 3V operation. VDD_232 should be connected to the same power level of the RS-232 interface. (The RS-232 input signals are always 5V~3V tolerant.) Note: This document version only provides 5V DC characteristic information. Refer to future revisions for updates. Data input from Serial Bus Ring Indicator, active low Ground Power Data Set Ready, active low Data Carrier Detect, active low Clear To Send, active low Shut Down RS232 Transceiver During Reset, this pin is input for simulation purpose. During normal operation, this pin is Serial ROM clock Serial ROM data signal USB DPLUS signal USB DMINUS signal 3.3V power for USB transceiver 3.3V ground System Reset Power Ground Description 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 RXD RI_N GND VDD DSR_N DCD_N CTS_N SHTD_N EE_CLK EE_DATA DP DM VDD_3V3 GND_3V3 RESET VDD GND I I P P I I I O I/O I/O I/O I/O P P I P P

Pin No. 22 Name TRI_STATE Type I Description Tri-State This pin is referred after reset. High: RS-232 output inactive during Suspend. Low: RS-232 output tri-state during Suspend. 23 LD_MD/ SHTD I/O Load Mode/SHTD This pin is input during reset. Pull high with a 220K resistor to indicate the heavy load USB device (500mA). Pull down with a 220K resistor to indicate the light load USB device 100mA). After reset, this pin becomes output. It output the inverse of 24 25 26 27 28 VDD_PLL GND_PLL PLL_TEST OSC1 OSC2 P P I I O SHTD_N. 5V power for PLL Ground for PLL PLL test mode control Crystal oscillator input Crystal oscillator output

Type: I – Input signal O – Output signal I/O – Bi-directional signal P – Power/Ground

Supported Data Formats and Programmable Baud Rate Generator

The PL2303 USB-to-RS232 bridge controller supports versatile data formats and has a

programmable baud rate generator. The supported data formats are shown on Table 2. The programmable baud rate generator supports baud rates up to 1.2M bps as shown in Table 3.

Table 2. Supported Data Formats

Stop bits 1 1.5 2 None Odd Even Mark Space Data bits 5, 6, 7, 8, or 16 Description Parity type

Table 3. Baud Rate Setting dwDTERate 0012C000h 000E1000h 00096000h 00070800h 00038400h 0001C200h 0000E100h 00009600h 00007080h 00004B00h 00003840h 00002580h 00001C20h 000012C0h 00000E10h 00000960h 00000708h 000004B0h 00000258h 0000012Ch 00000096h 0000004Bh Baud Rate 1228800 921600 614400 460800 230400 115200 57600 38400 28800 19200 14400 9600 7200 4800 3600 2400 1800 1200 600 300 150 75

External EEPROM and Device Configuration

PL-2303 allows storing the configuration data in an external EEPROM. After reset, the first two bytes of EEPROM are checked. If the value is 067Bh, the EEPROM is valid and the contents of the EEPROM are loaded as the chip’s default parameters. Otherwise, the chip’s default setting is used. The content of EEPROM is shown in Table 4 below.

The Device Configuration Register is used to control some vendor-specific functions. The meaning of each bit in Device Configuration Register is shown in Table 5. Reserved and unused pins always set to the default value.

Table 4. EEPROM Content

Bytes 1:0 Name EECHK Description When the EEPROM is programmed, these two bytes is configured as 067B. After reset, they will be checked for the value. If matched, the following information will be loaded as the default parameters. USB Vendor ID Product ID Release number (BCD) Device Configuration Register 3:2 5:4 7:6 10:8 VID PID RN DCR

Table 5. Device Configuration Register

Name 23 22 Bits RESERVED TRI_OUT Reserved RS-232 Output Tri-state: 1: RS-232 output tri-state 0: RS-232 output in output mode Remote Wakeup Mode: 0: When engages remote wakeup, the device issues disconnect signal 1: When engages remote wakeup, the device issues resume signal Enable Wake Up Trigger on RXD: 0 – Disabled; 1 – Enable Wake Up Trigger on RXD state changes. Enable Wake Up Trigger on DSR: 0 – Disabled; 1 – Enable Wake Up Trigger on DSR state changes. 18 WURI Enable Wake Up Trigger on RI: 0 – Disabled; 1 – Enable Wake Up Trigger on RI state changes. Enable Wake Up Trigger on DCD: 0 – Disabled; 1 – Enable Wake Up Trigger on DCD state changes. Enable Wake Up Trigger on CTS: 0 – Disabled; 1 – Enable Wake Up Trigger on CTS state changes. 15 14 13 12 RESERVED RESERVED RESERVED RW_INH Always set to one Always set to zero Always set to zero Remote Wake Inhibit: 1 – Inhibit the USB Remote Wakeup function 0 – Enable the USB Remote Wakeup function Always set to zero RTS Control Method: 00b – RTS is controlled by ControlBitMap. Signal is active low; 01 – RTS is controlled by ControlBitMap. Signal is active high; 10 – Drive RTS active when Downstream Data Buffer is NOT EMPTY; otherwise Drive RTS inactive. 11 – Drive RTS inactive when Downstream Data Buffer is NOT EMPTY; otherwise Drive RTS active. 3:1 0 RESERVED RSPDM Always set to zero RS-232 Transceiver Shut-Down Mode: 1: Shut down the transceiver when USB SUSPEND is engaged 0: Do not shut down the transceiver even when USB SUSPEND is engaged 0 1 1 0 0 0 1 Definition Default 0 0 21 RW_MODE 1 20 WURX 0 19 WUDSR 0 17 WUDCD 0 16 WUCTS 0 11:6 5:4 RESERVED RTSM 0 0

Electrical Characteristics

Absolute Maximum Ratings

Item Power Supply Voltage Input Voltage Output Voltage Storage Temperature -0.3 to 6.0 V -0.3 to VDD+0.3 V -0.3 to VDD+0.3 V -55 to 150 C o Ratings

DC Characteristics

Parameter Power Supply Current Input Voltage Low High Output Voltage Low High Schmitt Trigger Threshold Voltage* Negative going Positive going Output Voltage, 3.3V* Low High Input Leakage Current Tri-state Leakage Current Input Capacitance Output Capacitance Bi-directional Buffer Capacitance Operating Voltage Range Suspend Current 2 1 Symbol IDD VIL VIH VOL VOH Vt- Vt+ VOL VOH IL Ioz CIN COUT CBID -- ISUS Min 0.5 -- 0.7* VDD -- 3.5 -- -- -- 2.4 -1 -10 -- -- -- 4.75 -- Typ 19 -- -- -- -- 1.10 1.87 -- -- -- -- 3 3 3 5 400 Max 24 0.3* VDD -- 0.4 -- -- -- 0.4 -- 1 10 -- -- -- 5.25 490 Units mA V V V V V V V V uA uA Pf Pf Pf V uA *1. RS232 pins RXD_I, RI_I, DSR_I, DCD_I, CTS_I are 5V TTL Schmitt Trigger inputs. *2. RS232 pins TXD, DTR_N, RTS_N are 3.3V tri-state outputs.

Temperature Characteristics

Parameter Operating Temperature Junction Operation Temperature Symbol -- TJ Min -40 0 Typ -- 25 Max 85 115 Units o o C C

USB Transceiver Characteristics

Parameter Rise and Fall Times: (10%―90%) (90%―10%) Cross Point Output Impedance High Level Output Low Level Output High Level Input Low Level Input TR TF VCR RD VOH VOL VIH VIL 4 4 1.3 23 2.8 -- 2.0 -- 8 8 -- 28 -- -- -- -- 15 15 2.0 33 -- 0.7 -- 0.8 ns ns V ohm V V V V Symbol Min Typ Max Units ? C L : 50pf

Clock Characteristics

Parameter Frequency of Operation Clock Period Duty Cycle Min 11.976 83.1 45 Typ 12.000 83.3 50 Max 12.024 83.5 55 Units MHz ns %

Package Dimensions (28-Pin SSOP)

Symbol Min b E E1 L R1 D A e L1 A1 A2 0.05 1.65 0.22 7.40 5.00 0.55 0.09 9.9 Millimeters Nom 7.80 5.30 0.75 10.2 0.65 1.25 1.75 1.85 Max 0.38 8.20 5.60 0.95 10.5 2.0 0.020 0.065 Min 0.009 0.291 0.197 0.021 0.004 0.390 Inch Nom 0.307 0.209 0.030 0.402 0.0256 0.050 0.069 0.073 Max 0.015 0.323 0.220 0.037 0.413 0.079

Outline Diagram

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