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FT230XQ-R Datasheet(PDF) 27 Page - Future Technology Devices International Ltd. |
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FT230XQ-R Datasheet(HTML) 27 Page - Future Technology Devices International Ltd. |
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27 / 44 page  Copyright © Future Technology Devices International Limited 27 FT230X USB TO BASIC UART IC Version 1.4 Document No.: FT_000566 Clearance No.: FTDI# 260 7.3 USB to RS422 Converter FT230X 1 2 3 4 5 SHIELD Ferrite Bead GND GND VCC GND VCC 3V3OUT USBDM USBDP VCCIO VCC RESET# 100nF 100nF 10nF 4.7uF + RS 422 LEVEL CONVERTER Vcc ZT3491 5 3 4 7 6 10 9 11 12 RS 422 LEVEL CONVERTER ZT3491 3 4 7 6 Vcc Vcc 10K 2 5 11 12 9 10 GND SHIELD TXDM TXDP RXDP RXDM RTSM RTSP CTSP CTSM 2 RXD TXD RTS# CTS# PWREN# SLEEP# 27R 27R GND 47pF 47pF VCCIO RXD TXD RTS CTS Figure 7.3 USB to RS422 Converter Configuration An example of using the FT230X 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 FT230X to convert the TTL levels of the FT230X to RS422 levels. There are many suitable level converter devices available. This example uses Zywyn ZT3491 devices which have enables on both the transmitter and receiver. Since the ZT3491 transmitter enable is active high, it is connected to a CBUS pin in SLEEP# configuration. The ZT3491 receiver enable is active low and is therefore connected to a CBUS pin PWREN# configuration. This ensures that when both the ZT3491 transmitters and receivers are enabled then the device is active, and when the device is in USB suspend mode, the ZT3491 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 ZT3491 devices to ensure that the USB standby current of 2.5mA is met. The ZT3491 is specified to transmit and receive data at a rate of up to 16 Mbaud. In this example the maximum data rate is limited to 3 Mbaud by the FT230X. |
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