原创介绍一款UBS to RS232 转换芯片PL-2303HX

 2010-2-22 11:47  5805 4 4 分类: 通信

USB转串口线：
　　PROLIFIC推出了USB TO 类RS232接口转换芯片PL-2303HX，PL-2303HX可完美的应用于PDA、Modem、GPS、手机、数码相机、读卡机等与PC机的通讯电缆上，实际上很多手机的USB数据线就是采用PL-2303HX＋ADM213构成。PL-2303HX提供一个RS-232全双工异步串行通信装置与USB功能接口便利联接的解决方案，PL-2303HX的高兼容驱动可在大多操作系统上模拟成传统COM端口，并允许基于COM端口之应用很方便地转换成USB接口应用．利用USB大容量传输模式，大型数据缓冲器，和自动流量控制的优势，PL-2303HX有能力达到比传统通用异步收发端口更高的吞吐量。当不要求是标准RS-232信号时，波特率可高于115200 bps，用于更高的性能应用，灵活的PL-2303HX波特率发生器能被编程而产生任何75 bps～6,000,000 bps 或 6Mbps之间。（部分资料来自www.4sun.com.cn）
　　PL-2303HX是专为移动电话和嵌入式的解决方案着想，提供一个能很容易装配到任何连接器和掌上设备的小型芯片，PL-2303HX无论在工作中或等待模式中消耗的电量都非常少，可留给连接的设备许多的电能。与RS-232串行端口的讯号标准一样灵活,允许PL-2303HX直接连接1.8V~3.3V的设备，我之所有推荐这个芯片，是因为在同功能的芯片中它在价格上具有绝对优势。
特性：
完全适用于USB 1.1标准
● 内置USB 1.1收发器，5V —〉3.3V电源管理器，和12MHz 晶体振荡器
● 支持类RS232接口
● 全双工发送和接收（RXD、TXD）
● 六个调制解调器控制脚（RTS发送请求、CTS清除发送、DTR数据终端准备好、DSR数据准备好、DCD数据载波检测、RI响铃指示器）
● 5, 6, 7或8数据位
● 单数、双数、分数、空格或无奇偶模式
● 1、1.5、或2停止位
● 奇偶检验误差、框架检验误差、和串联中断侦测
● 从75 bps至 6 Mbps可编程的波特率
● 外置RS-232驱动器电源关闭控制
● 独立串行接口电源
● 大范围流控制机制
● 自动清除发送/发送请求的流控制
● 自动XON/XOFF软件流控制
● 数据缓冲器超流量侦测
● 可配置的512-byte 双方向数据缓冲器
● 256-byte 发送缓冲器和256-byte 接受缓冲器
● 128-byte 发送缓冲器和384-byte 接受缓冲
● 支持从调制解调器输入讯号远方唤醒
● 两个GPIO
● 可选择外置EEPROM电可擦除只读存储器储存客户ID
● SSOP 28 小型封装

USB to Serial Bridge Controller

The PL-2303HX is a low cost and high performance USB-to-Serial Bridge Controller. The PL-2303HX provides a convenient solution for connecting an RS-232 full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. The PL-2303HX highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready. The PL-2303HX is exclusively designed for mobile and embedded solutions in mind, providing a small footprint that could easily fit in to any connectors and handheld devices. With very small power consumption in either operating or suspend mode, the PL-2303HX is perfect for bus power operation with plenty of power left for the attached devices. Flexible signal level requirement on the RS-232 serial port side also allows the PL-2303HX to connect directly to 3.3V ~ 1.8V devices. PL-2303HX integrates on-chip clock generator and OTP ROM to save external crystal and EEPROM. Customers can design with effective BOM cost and compact PCB size.

Full compliance with the USB Specification v1.1
On-chip USB 1.1 transceiver and 5V?3.3V regulator
Supports RS-232 serial interface with Programmable baud rate from 75 bps to 12 Mbps (Rev D)
Supports RS422/RS485 interface (Rev D)
Integrates on-chip Clock Generator (Rev D)
On-chip OTP (One Time Programming) ROM for startup device configurations like product string and serial number string (Rev D)
Extensive flow control mechanism like adjustable high/low watermark level, automatic hardware or software flow control, and inbound data buffer overflow detection
Configurable 256-byte outbound buffer and 256-byte inbound buffer; or 128-byte outbound buffer and 384-byte inbound buffer
Supports remote wake-up from MODEM input signals
Supports up to 8 GPIO pins (Rev D) - 4 General Purpose I/O pins & 4 Auxiliary General Purpose I/O
Package type: SSOP28 / QFN32