參數(shù)資料
型號(hào)： FT232BM
廠商： Electronic Theatre Controls, Inc.
英文描述： Generation of FTDI’s Popular USB UART I.C.
中文描述： 在FTDI的流行的USB UART的新一代集成電路
文件頁(yè)數(shù)： 22/24頁(yè)
文件大?。?/td> 812K
代理商： FT232BM
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 22 of 24
FT232BM USB UART ( USB - Serial) I.C.
7.6 Interfacing to 3.3v Logic
Figure 15
Bus Powered Circuit with 3.3v logic drive / supply voltage
Ferrite Bead
470R
0.1uF
VCC
27R
USB "B"
Connector
27R
USB DM
8
FT232BM
USB DP
7
V
C
C
V
C
C
V
C
C
I
O
3
26
13
1
2
3
4
33nF
3v3OUT
6
A
V
C
C
30
10nF
0.1uF
In
Out
Gnd
3.3v LDO Regulator
3.3v Power to External
Logic
Figure 15 shows how to configure the FT232BM 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 UART 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 4.4 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.
When using the FT232BM in a self powered USB design, simply connect VCCIO to the 3.3v supply rail of the external
3.3v logic. Suspend current is not a consideration for self powered designs.
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 FT232BM to supply the 3.3v without any other components being required. In this case, connect
VCCIO to the 3v3OUT pin of the FT232BM.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT232BQ 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART ( USB - Serial) I.C.
FT232BQ-REEL 功能描述:USB 接口集成電路 USB to Serial UART 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
FT232HL 制造商:FTDI 制造商全稱:FTDI 功能描述:FT232H Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC
FT232HL-REEL 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 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
FT232HL-TRAY 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 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
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