參數(shù)資料
型號(hào)： FT232RL-REEL
廠商： FTDI, Future Technology Devices International Ltd
文件頁(yè)數(shù)： 17/43頁(yè)
文件大小： 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(biāo)準(zhǔn)包裝： 1
系列： USBmadeEZ-UART
特點(diǎn)： 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(dòng)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(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)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
Copyright 2010 Future Technology Devices International Limited
24
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.10
Clearance No.: FTDI# 38
6.2 Self Powered Configuration
Figure 6.2 Self Powered Configuration
Figure 6.2 illustrates the FT232R in a typical USB self powered configuration. A USB self powered device
gets its power from its own power supply, VCC, 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 needs 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, a bus powered USB hub or a self
powered USB hub.
The power descriptor in the internal EEPROM of the FT232R should be programmed to a value of zero
(self powered).
In order to comply with the first requirement above, the USB bus power (pin 1) is used to control the
RESET# pin of the FT232R device. When the USB host or hub is powered up an internal 1.5kΩ resistor on
USBDP is pulled up to +3.3V (generated using the 4K7 and 10k resistor network), thus identifying the
device as a full speed device to the USB host or hub. When the USB host or hub is powered off, RESET#
will be low and the FT232R is held in reset. Since RESET# is low, the internal 1.5kΩ resistor is not pulled
up to any power supply (hub or host is powered down), so no current flows down USBDP via the 1.5kΩ
pull-up resistor. Failure to do this may cause some USB host or hub controllers to power up erratically.
Figure 6.2 illustrates a self powered design which has a +4V to +5.25V supply.
Note:
1. When the FT232R is in reset, the UART interface I/O pins are tri-stated. Input pins have internal
200kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external
logic.
2. When using internal FT232R oscillator the VCC supply voltage range must be +4.0V to 5.25V.
3. When using external oscillator the VCC supply voltage range must be +3.3V to 5.25V
Any design which interfaces to +3.3 V or +1.8V would be having a +3.3V or +1.8V supply to
VCCIO.
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