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參數資料
| 型號： | FT232RQ |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Incorporating Clock Generator Output and FTDIChip-ID Security Dongle |
| 中文描述： | 納入時鐘發生器輸出和FTDIChip標識安全適配器 |
| 文件頁數： | 22/29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 22
7.4 USB Bus Powered with 3.3V / 5V Supply and Logic Drive / IO Supply Voltage
Figure 14 - Bus Powered with 3.3V / 5V Supply and Logic Drive
Figure 14 shows a configuration where a jumper switch is used to allow the FT232R to be interfaced with a 3.3V or
5V logic devices. The VCCIO pin is either supplied with 5V from the USB bus, or with 3.3V from the 3V3OUT pin. The
supply to VCCIO is also used to supply external logic.
Please note the following in relation to bus powered designs of this type -
i)
PWREN# or SLEEP# signals should be used to power down external logic during USB suspend mode, in order to
comply with the limit of 500μA. If this is not possible, use the configuration shown in
Section 7.3
.
ii) The maximum current source from USB Bus during normal operation should not exceed 100mA, otherwise a bus
powered design with power switching (
Section 7.3
) should be used.
Another possible configuration would be to use a discrete low dropout regulator which is supplied by the 5V on the
USB bus to supply 2.8V - 1.8V to the VCCIO pin and to the external logic. VCC would be supplied with the 5V from
the USB bus. With VCCIO connected to the output of the low dropout regulator, would in turn will cause the FT232R
I/O pins to drive out at 2.8V - 1.8V logic levels.
For USB bus powered circuits some considerations have to be taken into account when selecting the regulator –
iii) The regulator must be capable of sustaining its output voltage with an input voltage of 4.35V. A Low Drop Out
(L.D.O.) regulator must be selected.
iv) The quiescent current of the regulator must be low in order to meet the USB suspend total current requirement of
<= 500μA during USB suspend.
An example of a regulator family that meets these requirements is the MicroChip / Telcom TC55 Series of devices
(
www.microchip.com
). These devices can supply up to 250mA current and have a quiescent current of under 1μA.
FT232R
A
G
N
D
G
N
D
G
N
D
G
N
D
T
E
S
T
100nF
3V3OUT
VCCIO
NC
RESET#
NC
10nF
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS3
CBUS2
CBUS1
USBDP
USBDM
VCC
1
2
3
4
5
OSCI
OSCO
CBUS4
Ferrite
Bead
+
SHIELD
GND
GND
GND
3.3V or 5V Supply
to External Logic
100nF
+
100nF
Vcc
4.7uF
GND
1
2
3
Jumper
SLEEP#
PWREN#
Vcc
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相關代理商/技術參數 |
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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 產品:USB 2.0 數據速率: 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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