參數(shù)資料
型號(hào)： FT245BM
廠商： Future Technology Devices International Ltd
元件分類： 微控制器/微處理器
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PQFP32
封裝： 7 X 7 MM, 0.80 MM PITCH, LQFP-32
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 995K
代理商： FT245BM
DS245B Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 19 of 24
FT245BM USB FIFO ( USB - Parallel ) I.C.
Figure 9
Bus Powered Circuit with 3.3V logic drive / supply voltage
Ferrite Bead
470R
0.1uF
VCC
27R
USB "B"
Connector
27R
USB DM
8
FT245BM
USB DP
7
V
C
V
C
V
C
I
O
3
26
13
1
2
3
4
33nF
3v3OUT
6
A
V
C
30
10nF
0.1uF
In
Out
Gnd
3.3v LDO Regulator
3.3v Power to External
Logic
Figure 9 shows how to congure the FT245BM to interface with a 3.3V logic device. In this example, a discrete
3.3V regulator is used to supply the 3.3V logic from the USB supply. VCCIO is connected to the output of the 3.3V
regulator, which in turn will cause the FIFO interface IO pins to drive out at 3.3V level. For USB bus powered circuits
some considerations have to be taken into account when selecting the regulator –
a) The regulator must be capable of sustaining its output voltage with an input voltage of 4.35 volts. A Low Drop Out
(LDO) regulator must be selected.
b) The quiescent current of the regulator must be low in order to meet the USB suspend total current requirement of
<= 500uA during USB suspend.
An example of a regulator family that meets these requirements is the MicroChip (Telcom) TC55 Series. These
devices can supply up to 250mA current and have a quiescent current of under 1uA.
In some cases, where only a small amount of current is required (< 5mA) , it may be possible to use the in-built
regulator of the FT245BM to supply the 3.3V without any other components being required. In this case, connect
VCCIO to the 3V3OUT pin of the FT245BM.
Note : It should be emphasised that the 3.3V supply for VCCIO in a bus powered design with a 3.3V logic interface
should come from an LDO which is supplied by USB bus, or from the 3V3OUT pin of the FT245BM, and not from any
other source.
OBSOLETE
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT245BM-TRAY 功能描述:USB 接口集成電路 Obsolete See FT245RL 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
FT245BQ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FT245BQ USB FIFO ( USB - Parallel ) I.C.
FT245BQ-REEL 功能描述:USB 接口集成電路 USB to Parallel FIFO 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
FT245R 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO I.C. Incorporating FTDIChip-ID⑩ Security Dongle
FT245R_10 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface
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