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參數資料
| 型號： | 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 |
| 文件頁數： | 23/24頁 |
| 文件大?。?/td> | 812K |
| 代理商： | FT232BM |
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 23 of 24
FT232BM USB UART ( USB - Serial) I.C.
7.7 Power Switching
Figure 16
Bus Powered Circuit ( <= 100mA ) with Power Control
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
PWREN#
15
0.1uF
Switched 5v Power to
External Logic
P-Channel Power
MOSFET
s
g
d
USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet the <= 500uA total
suspend current requirement ( including external logic ). Some external logic can power itself down into a low current
state by monitoring the POWEREN# pin. For external logic that cannot power itself down in that way, the FT232BM
provides a simple but effective way of turning off power to external circuitry during USB suspend.
Figure 16 shows how to use a discrete P-Channel Logic Level MOSFET to control the power to external logic circuits.
A suitable device could be a Fairchild NDT456P or equivalent. This configuration is suitable for powering external logic
where the normal supply current is <= 100mA and the logic to be controlled does not generate an appreciable current
surge at power-up. For power switching external logic that takes over 100mA or generates a current surge on power-
up we recommend that a dedicated power switch i.c with inbuilt “soft-start” is used instead of a MOSFET. A suitable
power switch i.c. for such an application would be a Micrel (
www.micrel.com
) MIC2025-2BM or equivalent.
Please note the following points in connection with power controlled designs –
a) The logic to be controlled must have it’s own reset circuitry so that it will automatically reset itself when power is
re-applied on coming out of suspend.
b) Set the soft pull-down option bit in the FT232BM EEPROM.
c) For 3.3v power controlled circuits VCCIO must not be powered down with the external circuitry ( PWREN# gets
it’s VCC supply from VCCIO ). Either connect the power switch between the output of the 3.3v regulator and the
external 3.3v logic OR if appropriate power VCCIO from the 3v3OUT pin of the FT232BM.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| 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 |
| 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 |
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