参数资料
型号: FT2232D-REEL
厂商: FTDI, Future Technology Devices International Ltd
文件页数: 28/61页
文件大小: 0K
描述: IC USB FS DUAL UART/FIFO 48-LQFP
产品培训模块: USB Introduction
标准包装: 1
系列: USBmadeEZ-FIFO,FT-X,X-Chip
特点: USB 至 UART 和(或)FIFO、SPI、I2C、JTAG
通道数: 2,DUART
FIFO's: 384 字节
规程: RS232,RS422,RS485
电源电压: 4.35 V ~ 5.25 V
带并行端口:
带自动流量控制功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP
包装: 标准包装
产品目录页面: 634 (CN2011-ZH PDF)
配用: 768-1030-ND - MOD USB HS FT2232H EVAL
813-1009-ND - MODULE USB-TO-FPGA TOOL W/MANUAL
813-1001-ND - MODULE USB ADAPTR FOR FT2232D LP
813-1000-ND - MODULE USB ADAPTER FOR FT2232D
其它名称: 768-1010-6
Copyright 2010 Future Technology Devices International Limited
34
Document No.: FT_000173
FT2232D DUAL USB TO SERIAL UART
/FIFO IC Datasheet
Version 2.05
Clearance No.: FTDI# 127
Figure 8.3 USB <=> Dual Port RS485 Converter Configuration
Figure 8.3 illustrates how to connect the UART interfaces of the FT2232D to two TTL – RS485 Level
Converter I.C.s to make a USB to dual port RS485 converter. This example uses two Sipex SP491
devices but there are similar parts available from Maxim and Analog Devices amongst others. The SP491
is a RS485 device in a compact 8 pin SOP package. It has separate enables on both the transmitter and
receiver. With RS485, the transmitter is only enabled when a character is being transmitted from the
UART. The TXDEN pins on the FT2232D are provided for exactly that purpose, and so the transmitter
enables are wired to the TXDENs. The receiver enable is active low, so it is wired to the PWREN# pin to
disable the receiver when in USB suspend mode.
RS485 is a multi-drop network – i.e. many devices can communicate with each other over a single two
wire cable connection. The RS485 cable requires to be terminated at each end of the cable. Links are
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