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FT232RL-2000 Datasheet(PDF) 29 Page - Future Technology Devices International Ltd. |
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FT232RL-2000 Datasheet(HTML) 29 Page - Future Technology Devices International Ltd. |
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29 / 43 page  Copyright © 2010 Future Technology Devices International Limited 29 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 7.3 USB to RS422 Converter FT232R GND GND 100nF VCC USBDM USBDP VCCIO NC RESET# NC OSCI OSCO 3V3OUT A G N D G N D G N D G N D T E S T TXD RXD RTS# CTS# DTR# DSR# DCD# RI# CBUS0 CBUS1 CBUS2 CBUS3 CBUS4- 1 2 3 4 GND SHIELD GND 100nF 4.7uF + 5 10nF + Ferrite Bead Vcc Vcc PWREN# RS422 LEVEL CONVERTER Vcc SP491 5 3 4 7 6 TXDM TXDP RXDP RXDM 120R 10 9 11 12 SLEEP# RS422 LEVEL CONVERTER SP491 3 4 7 6 Vcc Vcc 10K 2 5 120R 11 12 9 10 RTSM RTSP CTSP CTSM GND DB9M SHIELD TXDM TXDP RXDP RXDM RTSM RTSP CTSP CTSM 2 Figure 7.3 USB to RS422 Converter Configuration An example of using the FT232R as a USB to RS422 converter is shown in Figure 7.3. In this application, two TTL to RS422 Level Converter ICs are used on the serial UART interface of the FT232R to convert the TTL levels of the FT232R to RS422 levels. There are many suitable level converter devices available. This example uses Sipex SP491 devices which have enables on both the transmitter and receiver. Since the SP491 transmitter enable is active high, it is connected to a CBUS pin in SLEEP# configuration. The SP491 receiver enable is active low and is therefore connected to a CBUS pin PWREN# configuration. This ensures that when both the SP491 transmitters and receivers are enabled then the device is active, and when the device is in USB suspend mode, the SP491 transmitters and receivers are disabled. If a similar application is used, but the design is USB BUS powered, it may be necessary to use a P-Channel logic level MOSFET (controlled by PWREN#) in the VCC line of the SP491 devices to ensure that the USB standby current of 2.5mA is met. The SP491 is specified to transmit and receive data at a rate of up to 5 Mbaud. In this example the maximum data rate is limited to 3 Mbaud by the FT232R. |
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