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參數資料
| 型號： | FT232R |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Incorporating Clock Generator Output and FTDIChip-ID Security Dongle |
| 中文描述： | 納入時鐘發生器輸出和FTDIChip標識安全適配器 |
| 文件頁數： | 24/29頁 |
| 文件大?。?/td> | 471K |
| 代理商： | FT232R |
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FT232R USB UART I.C. Datasheet Version 1.04
Future Technology Devices International Ltd. 2005
Page 24
8.2 USB to RS485 Converter Configuration
Figure 16 - Example USB to RS485 Converter Configuration
Figure 16 illustrates how to connect the FT232R’s UART interface to a TTL – RS485 Level Converter I.C. to make a
USB to RS485 converter. This example uses the Sipex SP481 device but there are similar parts available from Maxim
and Analog Devices amongst others. The SP481 is a RS485 device in a compact 8 pin SOP package. 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 signal CBUS pin option on the FT232R is provided for exactly this purpose
and so the transmitter enable is wired to CBUS2 which has been configured as TXDEN. Similarly, CBUS3 has been
configured as PWREN#. This signal is used to control the SP481’s receiver enable. The receiver enable is active low,
so it is wired to the PWREN# pin to disable the receiver when in USB suspend mode. CBUS2 = TXDEN and CBUS3 =
PWREN# are the default device configurations of these pins. See
Section 10
.
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. A link is provided to allow the cable
to be terminated if the device is physically positioned at either end of the cable.
In this example the data transmitted by the FT232R is also received by the device that is transmitting. This is a
common feature of RS485 and requires the application software to remove the transmitted data from the received
data stream. With the FT232R it is possible to do this entirely in hardware – simply modify the schematic so that RXD
of the FT232R is the logical OR of the SP481 receiver output with TXDEN using an HC32 or similar logic gate.
FT232R
A
G
N
D
G
N
D
G
N
D
G
N
D
T
E
S
T
100nF
3V3OUT
VCCIO
NC
RESET#
NC
+
100nF
10nF
Vcc
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS3
TXDEN#
CBUS1
GPIO1
GPIO4
USBDP
USBDM
VCC
1
2
3
4
5
OSCI
OSCO
CBUS4
Ferrite
Bead
+
4.7uF
SHIELD
SHIELD
GND
10
DB9M
RS485 LEVEL
CONVERTER
TXD
RXD
PWREN#
Vcc
Link
120R
5
6
7
3
4
1
2
SP481
GPIO0
Vcc
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FT232R_10 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
| FT232RL | 制造商:Future Technology Devices International 功能描述:USB UART IC 28-Pin SSOP T/R 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC USB TO UART SMD SSOP28 232 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB TO UART, SMD, 28SSOP 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB UART INTERFACE, SSOP-28; USB Version:1.1, 2.0; Supply Voltage Min:1.8V; Supply Voltage Max:5.25V; Digital IC Case Style:SSOP; No. of Pins:28; Data Rate:3Mbps; Operating Temperature Min:-40C; Operating Temperature Max:85C ;RoHS Compliant: Yes |
| FT232RL R | 制造商:Future Technology Devices International Ltd 功能描述:UART, 28 Pin, Plastic, SSOP |
| FT232RL-2000 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
| FT232RL-BO | 功能描述:界面開發工具 FT232RL USB to UART Breakout Board RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
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