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参数资料
| 型号： | FT245BM |
| 厂商： | Future Technology Devices International Ltd |
| 元件分类： | 微控制器/微处理器 |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, LQFP-32 |
| 文件页数： | 9/24页 |
| 文件大小： | 995K |
| 代理商： | FT245BM |
DS245B Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 17 of 24
FT245BM USB FIFO ( USB - Parallel ) I.C.
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT245BM
USB DP
7
5
V
C
V
C
V
C
I
O
3
26
13
1
2
3
4
Ferrite Bead
1k5
33nF
3v3OUT
6
470R
A
V
C
30
0.1uF
G
N
D
G
N
D
A
G
N
D
9
17
29
10nF
VCC
RESET#
4
Decoupling Capacitors
10uF
VCC
0.1uF
+
7.3 USB Bus Powered and Self Powered Conguration
Figure 7
USB Bus Powered Conguration
Figure 7 illustrates a typical USB bus powered conguration. A USB Bus Powered device gets its power from the USB
bus. Basic rules for USB Bus power devices are as follows –
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500uA.
c) A Bus Powered High Power Device (one that draws more than 100mA) should use the PWREN# pin to keep the
current below 100mA on plug-in and 500uA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub
e) No device can draw more that 500mA from the USB Bus.
The power descriptor in the EEPROM should be programmed to match the current draw of the device.
A Ferrite Bead is connected in series with USB power to prevent noise from the device and associated circuitry (EMI)
being radiated down the USB cable to the Host. The value of the Ferrite Bead depends on the total current required by
the circuit – a suitable range of Ferrite Beads is available from Steward (www.steward.com) for example Steward Part
#
MI0805K400R-00 also available as DigiKey Part # 240-1035-1.
OBSOLETE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FT245BM-TRAY | 功能描述:USB 接口集成电路 Obsolete See FT245RL RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT245BQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FT245BQ USB FIFO ( USB - Parallel ) I.C. |
| FT245BQ-REEL | 功能描述:USB 接口集成电路 USB to Parallel FIFO IC QFN-32 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT245R | 制造商:FTDI 制造商全称:FTDI 功能描述:USB FIFO I.C. Incorporating FTDIChip-ID⑩ Security Dongle |
| FT245R_10 | 制造商:FTDI 制造商全称:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface |
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