參數(shù)資料
型號: FT2232HQ-TRAY
廠商: FTDI, Future Technology Devices International Ltd
文件頁數(shù): 18/67頁
文件大?。?/td> 0K
描述: IC USB HS DUAL UART/FIFO 64-QFN
標(biāo)準(zhǔn)包裝: 260
系列: USBmadeEZ-FIFO,F(xiàn)T-X,X-Chip
特點: USB 至 UART 和(或)FIFO、SPI、I2C、JTAG
通道數(shù): 2,DUART
FIFO's: 4096 字節(jié)
規(guī)程: RS232,RS422,RS485
電源電壓: 3 V ~ 3.6 V
帶并行端口:
帶自動流量控制功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-QFN
包裝: 托盤
其它名稱: 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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