- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381451 > AT43USB325E-AU (ATMEL CORP) Multimedia USB Keyboard Controller with Embedded Hub PDF資料下載
參數(shù)資料
| 型號： | AT43USB325E-AU |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64 |
| 封裝： | 1.40 MM HEIGHT, GREEN, PLASTIC, MS-026ACB, LQFP-64 |
| 文件頁數(shù)： | 90/109頁 |
| 文件大?。?/td> | 643K |
| 代理商： | AT43USB325E-AU |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁當(dāng)前第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁
90
3355C–USB–4/05
AT43USB325
8.4.5
Hub and Port Power Management
Overcurrent protection and power switching are required for the external downstream ports only.
In the AT43USB325, these tasks are completely programmable. This means that any type of
hub is achievable with the AT43USB325: self-powered or bus-powered hubs, per port or global
overcurrent protection, individual or ganged port power switching.
The use of the MCU's GPIO pins are required to interface to the external power supply monitor-
ing and switching. The on-chip hardware of the AT43USB325 contains the circuitry to handle all
the possible combinations of port power management tasks. The firmware defines the exact
configuration.
8.4.6
Overcurrent Sensing
The AT43USB325 is capable of detecting overcurrent during active operation only, or during any
condition even when the hub is in the suspended state. When overcurrent in the active state only
is desired, any GPIO pin of the AT43USB325 can be used to sense and the overcurrent condi-
tion. Control of the condition must be performed by the firmware. If overcurrent detection under
any condition is desired, then specific GPIO pins must be used to sense the overcurrent and the
proper bit(s) of UOVCER set. In Global Overcurrent Protection mode, overcurrent sensing must
be routed to GPIO PD0. In Individual Port Overcurrent Protection mode Port2 and Port 3 over-
current sensing must be assigned to GPIO PD0 and PD1. In the following description, it is
assumed that overcurrent protection is required under any condition.
1.
Global Overcurrent Protection
– In this mode, the Port Overcurrent Indicator and Port
Overcurrent Indicator Change should be set to 0's. For the AT43USB325 an external
solid state switch, such as the Micrel MIC2025-2, is required to switch power to the
external USB ports. The FLG output of the switch should be connected to PD0. When
an overcurrent occurs, FLG is asserted and the firmware should set the Hub Overcur-
rent Indicator and Hub Overcurrent Indicator Change and switch off power to all
external downstream ports. The hub status change is reported on the next IN token
through the hub's interrupt endpoint, Endpoint1.
Individual Port Overcurrent Protection
– The Hub Overcurrent Indicator and Hub
Overcurrent Indicator Change bits should be set to 0's. One MIC2026-2 is required for
the two USB ports. The FLG output of the MIC2026-2 associated with Port2 should be
connected to GPIO PD0 and the other FLG output to PD1. An overcurrent is indicated
by assertion of FLG. The firmware sets the corresponding port's Overcurrent Indicator
and the Overcurrent Indicator Change bits and switches off power to the port. At the
next IN token from the Host, the AT43USB325 reports the port status change through
the hub's Endpoint1.
2.
8.4.7
Port Power Switching
1.
Gang Power Switching
– One of the microcontroller GPIO pins, PWRN, must be pro-
grammed as an output to control the external switch such as the MIC2025-2. Switch
ON is requested by the USB Host through the SetPortFeature(PORT_POWER)
request. Switch OFF is executed upon receipt of a ClearPortFeature(PORT_POWER)
or upon detecting an overcurrent condition. The firmware clears the Power Control Bit.
Only if all of the Power Control Bits of ports 2 and 3 are cleared should the firmware de-
assert the PWRN pin.
Individual Power Switching
– Two microcontroller GPIO pins, PWR2N and PWR3N,
must be assigned for each USB port to control the external switch such as the
MIC2026-2. Each of the Power Control Bits controls one PWRxN.
Multiple Ganged Overcurrent Protection
– Overcurrent sensing is grouped physi-
cally into one or more gangs, but reported individually.
2.
3.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT43USB326-AC | Multimedia USB Keyboard Controller with Embedded Hub |
| AT43USB326-AU | Multimedia USB Keyboard Controller with Embedded Hub |
| AT43USB351M-AC | Full-speed/Low-speed USB Microcontroller with ADC and PWM |
| AT43USB353M-AC | Low Cost Full-speed USB Microcontroller with Embedded Hub, ADC and PWM |
| AT43USB355E-AC | Full-speed USB Microcontroller with Embedded Hub, ADC and PWM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT43USB326 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB326_06 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Multimedia USB Keyboard Controller with Embedded Hub |
| AT43USB326-AC | 功能描述:USB 接口集成電路 USB KEYBOARD F/LOGI- TECH - COM TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型: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 |
| AT43USB326-AU | 功能描述:USB 接口集成電路 USB KEYBOARD FOR LOGITECH - IND TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型: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 |
| AT43USB351M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。