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參數(shù)資料
| 型號： | FT232RL-REEL |
| 廠商： | FTDI, Future Technology Devices International Ltd |
| 文件頁數(shù)： | 22/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB FS SERIAL UART 28-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | USB Introduction USB-UART Interface Solutions |
| 標準包裝： | 1 |
| 系列： | USBmadeEZ-UART |
| 特點： | USB 至 UART |
| 通道數(shù)： | 1，UART |
| FIFO's： | 256 字節(jié) |
| 規(guī)程： | RS232，RS422，RS485 |
| 電源電壓： | 3.3 V ~ 5.25 V |
| 帶自動流量控制功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 634 (CN2011-ZH PDF) |
| 配用： | 768-1023-ND - MOD USB RS232 DEV/EVAL FT232RL 768-1022-ND - MOD USB UART MINI B DEV FT232R 768-1021-ND - MOD USB UART MINI DEV FT232R 768-1019-ND - MOD USB UART DEV FT232R |
| 其它名稱： | 768-1007-6 |
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Copyright 2010 Future Technology Devices International Limited
29
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.10
Clearance No.: FTDI# 38
7.3 USB to RS422 Converter
FT232R
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
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
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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