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)： 17/24頁(yè)
文件大小： 812K
代理商： FT232BM
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 17 of 24
FT232BM USB UART ( USB - Serial) I.C.
Figure 9
USB Self Powered Configuration (2)
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT232BM
USB DP
7
5
V
C
C
V
C
C
V
C
C
I
O
3
26
13
1
2
3
4
1k5
33nF
3v3OUT
6
470R
A
V
C
C
30
0.1uF
POWERCTL
14
G
N
D
G
N
D
A
G
N
D
9
17
29
VCC
RESET#
4
10k
4k7
Decoupling Capacitors
10uF
VCC
0.1uF
0.1uF
+
Figure 9 illustrates a variant of the circuit shown in Figure 8. This time, the 1k5 pull-up resistor on USB DP is
connected to RSTOUT# as per the bus-power circuit. However, the USB Bus Power is used to control the RESET#
Pin of the FT232BM device. When the USB Host or Hub power is off, RESET# will go low and the device will be held
in reset. As RESET# is low, RSTOUT# will also be low, so no current will be forced down USB DP via the 1k5 pull-up
resistor.
Note : When the FT232B is in reset, the UART interface pins all go tri-state. These pins have internal 200k pull-up
resistors to VCC-IO so they will gently pull high unless driven by some external logic.
Which of the two configurations to use depends on the nature of the peripheral design. With the configuration of
Figure 8, the FT232BM is “l(fā)ive” – when power to the USB port is shut off, there will be no activity on the USB bus
and the device will enter low power sleep mode after a few milliseconds. In this configuration, the RESET# pin is still
available if required.
In the Figure 9 configuration, the FT232BM is held in reset when the USB power is off. In reset, the FT232BM 6MHz
oscillator will still be running and the device will not be in low power mode.
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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(chēng):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(lèi)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(chēng):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(lèi)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(lèi)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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