参数资料
型号: FT2232HQ-TRAY
厂商: FTDI, Future Technology Devices International Ltd
文件页数: 18/67页
文件大小: 0K
描述: IC USB HS DUAL UART/FIFO 64-QFN
标准包装: 260
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: 4096 字节
规程: RS232,RS422,RS485
电源电压: 3 V ~ 3.6 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: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN
包装: 托盘
其它名称: FT2232HQ - TRAY
Copyright 2012 Future Technology Devices International Limited
25
Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Version 2.21
Clearance No.: FTDI#77
4.3.3 Dual Port RS485 Configuration
Figure 4.3 illustrates how the FT2232H can be configured as a dual RS485 interface.
Figure 4.3 Dual RS485 Configuration
In this case both channel A and channel B are configured as RS485 operating at TTL levels and a level
converter device (half duplex RS485 transceiver) is used to convert the TTL level signals from the
FT232H to RS485 levels. 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
FT2232H 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.
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相关代理商/技术参数
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