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参数资料
| 型号： | UM232R |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | MOD USB UART DEV FT232R |
| 产品培训模块： | USB Introduction USB-UART Interface Solutions |
| 产品目录绘图： | UM232R |
| 标准包装： | 5 |
| 主要目的： | 接口，USB 2.0 至 UART（RS232）电桥 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | FT232R |
| 主要属性： | 全速，300 ~ 3 MB 速率，安全识别号 |
| 次要属性： | 6 ~ 48MHz 时钟发生器输出，免版税驱动器 |
| 已供物品： | 板 |
| 产品目录页面： | 633 (CN2011-ZH PDF) |
| 相关产品： | 768-1008-6-ND - IC USB FS SERIAL UART 32-QFN 768-1007-6-ND - IC USB FS SERIAL UART 28-SSOP 768-1008-1-ND - IC USB FS SERIAL UART 32-QFN 768-1007-1-ND - IC USB FS SERIAL UART 28-SSOP 768-1008-2-ND - IC USB FS SERIAL UART 32-QFN 768-1007-2-ND - IC USB FS SERIAL UART 28-SSOP |
| 其它名称： | 768-1019 |
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Document Reference No.: FT_000051
UM232R USB - Serial UART Development Module
Datasheet Version 1.1
Clearance No.: FTDI# 125
7.4 Bus Powered with 3.3V Logic Drive / IO Supply Voltage
UM232R ? FTDI 2008
1
1
2
3
24
J1
12
J2
2
1
13
Figure 7.4 USB Bus Powered 3.3V Logic Drive
Figure 7.4 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 FT232R? s VCCIO pin is either supplied with 5V from the USB bus (connect
together pins 2 and 3 in J1), or with 3.3V from the FT232R?s 3V3OUT pin (connect together pins 1 and 2 on
J1 as show n) the supply to UM232R?s 3V3 pi n can also be used to supply up to 50mA to 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 500 μA. If this is not possible, use the configuration shown in Section
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 regulation which is supplied by the
5V on the USB bus to supply 2.8V – 1.8V to the VIO pin and to the external logic. VCC would be supplied
with the 5V from the USB bus (available from the module?s USB pin). With VIO connected to the output of
the low dropout regulator, this will cause the FT232R I/O pins to drive out at 2.8V – 1.8V logic levels.
For USB bus powered circuit some considerations have to be taken into account when selecting the
regulator:
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.
The quiescent current of the regulator must be low in order to meet the USB suspend total current
requirement of <= 500 μA 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 1 μA.
? Copyright 2005-2011 Future Technology Devices International Ltd
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