参数资料
型号: FT232HQ-REEL
厂商: FTDI, Future Technology Devices International Ltd
文件页数: 19/65页
文件大小: 0K
描述: IC HS USB TO UART/FIFO 48QFN
应用说明: FT1248 Application Note
标准包装: 1
通道数: 1,UART
FIFO's: 4kb
规程: RS232,RS422,RS485
电源电压: 1.62 V ~ 1.98 V,2.97 V ~ 3.63 V
带并行端口:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘
供应商设备封装: 48-QFN(8x8)
包装: 标准包装
其它名称: 768-1102-6
Copyright 2012 Future Technology Devices International Limited
26
Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.8
Clearance No.: FTDI #199
4.3.3 RS485 Configuration
Figure 4.3 illustrates how the FT232H can be configured as a RS485 interface.
Figure 4.3 Dual RS485 Configuration
In this case the FT232H is configured as a UART 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. With
RS485, the transmitter is only enabled when a character is being transmitted from the UART. The TXDEN
pin on the FT232H is provided for exactly that purpose, and so the transmitter enables are wired to the
TXDEN. 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 provided to allow the cable to be terminated if the device is physically positioned at either end
of the cable.
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