參數(shù)資料
型號(hào)： AT43312A-SC
廠商： ATMEL CORP
元件分類(lèi)： 總線控制器
英文描述： Self- and Bus-Bus-powered USB Hub Controller
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PDSO32
封裝： 0.440 INCH, PLASTIC, SOIC-32
文件頁(yè)數(shù)： 6/28頁(yè)
文件大小： 211K
代理商： AT43312A-SC
6
AT43312A
1255G–USB–05/06
Functional
Description
Summary
The Atmel AT43312A is a USB hub controller for use in a standalone hub as well as an
add-on hub for an existing non-USB peripheral such a PC display monitor or keyboard.
In addition to supporting the standard USB hub functionality, the AT43312A has addi-
tional features to enhance the user friendliness of the hub.
USB Ports
The AT43312A’s upstream port, Port0, is a full-speed port. A 1.5 k
pull-up resistor to
the 3.3V regulator output, CEXT, is required for proper operation. The downstream ports
support both full-speed as well as low-speed devices. 15 k
pull-down resistors are
required at their inputs.
Full-speed signal requirements demand controlled rise/fall times and impedance match-
ing of the USB ports. To meet these requirements, 22
resistors must be inserted in
series between the USB data pins and the USB connectors.
Hub Repeater
The Hub Repeater is responsible for port connectivity setup and tear-down. It also sup-
ports exception handling such as bus fault detection and recovery, and
connect/disconnect detection. Port0 is the root port and is connected to the root hub or
an upstream hub. When a packet is received at Port0, the AT43312A propagates it to all
the enabled downstream ports. Conversely, a packet from a downstream port is trans-
mitted from Port0.
The AT43312A supports downstream port data signaling at both 1.5 Mb/s and 12 Mb/s.
Devices attached to the downstream ports are determined to be either full-speed or low-
speed depending which data line (DP or DM) is pulled high. If a port is enumerated as
low-speed, its output buffers operate at a slew rate of 75 - 300 ns, and the AT43312A
will not propagate any traffic to that port unless it is prefaced with a preamble PID. Low-
speed data following the preamble PID is propagated to both low- and full-speed
devices. The AT43312A will enable low-speed drivers within four full-speed bit times of
the last bit of a preamble PID, and will disable them at the end of an EOP. Packets out of
Port0 are always transmitted using the full-speed drivers.
All the AT43312A ports independently drive and monitor their DP and DM pins so that
they are able to detect and generate the “J”, “K”, and SE0 bus signaling states. Each
hub port has single-ended and differential receivers on its DP and DM lines. The port I/O
buffers comply with the voltage levels and drive requirements as specified in the USB
Specifications Rev 1.0.
The Hub Repeater implements a frame timer which is timed by the 12 MHz USB clock
and gets reset every time an SOF token is received from the Host.
Serial Interface Engine
The Serial Interface Engine handles the USB communication protocol. It performs the
USB clock/data separation, the NRZI data encoding/decoding, bit stuffing, CRC genera-
tion and checking, USB packet ID decoding and generation, and data serialization and
de-serialization. The on chip phase locked loop generates the high frequency clock for
the clock/data separation circuit.
相關(guān)PDF資料
PDF描述
AT43312A-SU Self- and Bus-Bus-powered USB Hub Controller
AT43312A Self- and Bus-powered USB Hub Controller(自供電和總線供電USB集線器控制器)
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AT43320 Full-speed USB Hub/Function Microcontroller
AT43DK301 Low-Cost USB Hub Development Kit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT43312A-SU 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:Self- and Bus-Bus-powered USB Hub Controller
AT43320 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:Full-speed USB Hub/Function Microcontroller
AT43320-AC 功能描述:IC USB HUB CTRLR TO AVR 100-LQFP RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:4,900 系列:- 控制器類(lèi)型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱(chēng):Q6396337A
AT433A 功能描述:旋鈕和轉(zhuǎn)盤(pán) BLK KNOB FOR MR RoHS:否 制造商:Davies Molding 材料:Phenolic 設(shè)計(jì):Set Screw 軸尺寸:0.25 in 直徑:3/4 in 顏色:Black 指示器型式:Line
AT433A-RO 制造商:NKK Switches 功能描述:KNOB Actuator For the DRA Series
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