參數(shù)資料
型號: FT232HQ-REEL
廠商: FTDI, Future Technology Devices International Ltd
文件頁數(shù): 19/65頁
文件大?。?/td> 0K
描述: IC HS USB TO UART/FIFO 48QFN
應用說明: FT1248 Application Note
標準包裝: 1
通道數(shù): 1,UART
FIFO's: 4kb
規(guī)程: RS232,RS422,RS485
電源電壓: 1.62 V ~ 1.98 V,2.97 V ~ 3.63 V
帶并行端口:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤
供應商設備封裝: 48-QFN(8x8)
包裝: 標準包裝
其它名稱: 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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