參數(shù)資料
型號(hào)： AT43310
廠商： Atmel Corp.
英文描述： USB Hub
中文描述： USB集線器
文件頁(yè)數(shù)： 7/25頁(yè)
文件大?。?/td> 247K
代理商： AT43310
AT43310
7
pins OSC1 and OSC2 are recommended. The values for
these capacitors depends on the crystal and the layout of
the board, but typically are 33 pF at OSC1 and 47 pF at
OSC2. If the crystal used cannot tolerate the drive levels of
the oscillator, a series resistor between OSC2 and the crys-
tal pin may be used.
Figure 2 shows how to properly connect the oscillator for
the AT43310. Ceramic resonators are not recommended
due to the frequency stability required by the USB specifi-
cation (0.25%).
If desired, the clock can be externally sourced. To clock
externally, connect the clock source to the OSC1 pin, while
leaving the OSC2 pin floating. The switching level at the
OSC1 pin can be as low as 0.47V (see electrical specifica-
tions). A CMOS device is required to drive this pin to main-
tain good noise margins at the low switching level.
For proper operation of the PLL, see Figure 2-Ocscillator
and PLL Connection.
To provide the best operating condition for the AT43310,
careful consideration of the power supply connections are
recommended. Use short, low impedance connections to
all power supply lines: V
CC5
, V
CC3
, V
CCA
, and V
SS
with 0.1
μ
F decoupling capacitors of high quality adjacent to the
device pins.
Descriptors
The Hub Controller supports the following standard USB
descriptors: Device, Configuration, Interface, and Endpoint
Descriptors, as well as the class specific Hub Descriptor.
All the required Standard Requests and Hub Class-Specific
Requests are supported by the AT43310’s Hub Controller.
Figure 2.
Oscillator and PLL Connection
相關(guān)PDF資料
PDF描述
AT43311 USB Hub
AT43312A-AC Self- and Bus-Bus-powered USB Hub Controller
AT43312A-AU Self- and Bus-Bus-powered USB Hub Controller
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AT43312A-SU Self- and Bus-Bus-powered USB Hub Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT433104AA 制造商:LINPAC STORAGE SYSTEMS 功能描述:BLUE CONTAINER 25L
AT43311 制造商:Atmel Corporation 功能描述:
AT43312 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Self- and Bus- Powered USB Hub Controller
AT43312(32DIP) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS CONTROLLER
AT43312(32SOIC) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS CONTROLLER
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