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參數(shù)資料
| 型號(hào)： | FT232RQ |
| 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(shí)鐘發(fā)生器輸出和FTDIChip標(biāo)識(shí)安全適配器 |
| 文件頁數(shù)： | 20/29頁 |
| 文件大小： | 471K |
| 代理商： | FT232RQ |
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FT232R USB UART I.C. Datasheet Version 1.04
Future Technology Devices International Ltd. 2005
Page 20
7.2 Self Powered Configuration
Figure 12 Self Powered Configuration
Figure 12 illustrates the FT232R in a typical USB self powered configuration. A USB Self Powered device gets its
power from its own power supply and does not draw current from the USB bus. The basic rules for USB Self powered
devices are as follows –
i)
A Self Powered device should not force current down the USB bus when the USB Host or Hub Controller is
powered down.
ii) A Self Powered Device can use as much current as it likes during normal operation and USB suspend as it has its
own power supply.
iii) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs
The power descriptor in the internal EEPROM should be programmed to a value of zero (self powered).
In order to meet requirement (i) the USB Bus Power is used to control the RESET# Pin of the FT232R device. When
the USB Host or Hub is powered up the internal 1.5kΩ resistor on USBDP is pulled up to 3.3V, thus identifying the
device as a full speed device to USB. When the USB Host or Hub power is off, RESET# will go low and the device will
be held in reset. As RESET# is low, the internal 1.5kΩ resistor will not be pulled up to 3.3V, so no current will be forced
down USBDP via the 1.5kΩ pull-up resistor when the host or hub is powered down. Failure to do this may cause some
USB host or hub controllers to power up erratically.
Figure 10 illustrates a self powered design which has a 3.3V - 5V supply. A design which is interfacing to 2.8V - 1.8V
logic would have a 2.8V - 1.8V supply to VCCIO, and a 3.3V - 5V supply to VCC
Note : When the FT232R is in reset, the UART interface pins all go tri-state. These pins have internal 200kΩ pull-up
resistors to VCCIO, so they will gently pull high unless driven by some external logic.
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
VCC
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS3
CBUS2
CBUS1
USBDP
USBDM
VCC
1
2
3
4
5
OSCI
OSCO
CBUS4
4.7uF
SHIELD
GND
GND
GND
GND
VCC = 3.3V - 5V
GND
10k
4k7
100nF
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| FT232RQ-6000 | 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 |
| FT232RQ-REEL | 功能描述:USB 接口集成電路 USB to Serial UART Enhanced IC QFN-32 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| FT232RQ-TRAY | 制造商:Future Technology Devices International (FTDI Chip) 功能描述: |
| FT-23-43 | 制造商:Amidon 功能描述:Bulk |
| FT234XD-R | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC USB SERIAL BASIC UART 12DFN 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB to Serial UART Interface |
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