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參數(shù)資料
| 型號(hào)： | AT43312A-SC |
| 廠商： | ATMEL CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 211K |
| 代理商： | AT43312A-SC |
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7
AT43312A
1255G–USB–05/06
Power Management
A hub is a high-powered device and is allowed to draw up to 500 mA of current from the
host or upstream hub. The AT43312A chip itself and its external hub circuitry consume
much less than 100 mA. The AT43312A’s power management logic works with external
devices to detect overcurrent and control power to the ports.
Overcurrent sensing is on a per-port basis and is achieved through the OVCx pins.
Whenever the voltage at OVCx is asserted, the AT43312A treats it as an overcurrent
condition. This could be caused by an overload, or even a short circuit and could cause
the AT43312A to set the port’s PORT_OVER_CURRENT status bit and its
C_PORT_OVER_CURRENT status change bit. At the same time, power to the offend-
ing port is shut off and its STATx generates a square wave with a frequency of about 1
second.
An external device is needed to monitor the overcurrent condition and perform the
actual switching of the ports’ power under control of the AT43312A. Any type of suitable
switch or device is acceptable. However, it should have a low-voltage drop across it
even when the port absorbs full-power. In its simplest form this switch can be a P-chan-
nel MOSFET. One advantage of using a MOSFET switch is its very low-voltage drop
and low-cost.
Each one of the AT43312A’s port has its own power control pin which is asserted only
when a SetPortFeature[PORT-POWER] request is received from the host. PWRx is de-
asserted under the following conditions:
1.
Power-up
2.
Reset and initialization
3.
Overcurrent condition
4.
Requested by the host through a ClearPortFeature [PORT_POWER] for ALL the
ports
Self-powered Mode
In the self-powered mode, power to the downstream ports must be supplied by an exter-
nal power supply. This power supply must be capable of supplying 500 mA per port for a
total of 2A.
The USB specifications require that the voltage drop at the power switch and board
traces be no more than 100 mV. A good conservative maximum drop at the power
switch itself should be no more than 75 mV. Careful design and selection of the power
switch and PC board layout is required to meet the specifications. When using a MOS-
FET switch, its resistance must be 140 m
or less under worst case conditions. A
suitable MOSFET switch for an AT43312A based hub is an integrated high side dual
MOSFET switch such as the Micrel MIC2526.
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) |
| AT43312 | Self- and Bus- Powered USB Hub Controller |
| 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:ATMEL Corporation 功能描述:Self- and Bus-Bus-powered USB Hub Controller |
| AT43320 | 制造商:ATMEL 制造商全稱: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 安裝類型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱:Q6396337A |
| AT433A | 功能描述:旋鈕和轉(zhuǎn)盤 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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