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參數(shù)資料
| 型號(hào)： | AT43USB326-AU |
| 廠商： | Atmel Corp. |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 多媒體USB鍵盤控制器的嵌入式集線器 |
| 文件頁(yè)數(shù)： | 72/102頁(yè) |
| 文件大小： | 511K |
| 代理商： | AT43USB326-AU |
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AT43USB326
3313D–USB–04/06
Figure 12 shows a simplified diagram of a power management circuit of an AT43USB326
based hub design with global overcurrent protection and ganged power switching for the two
external downstream ports.
The over-current protection and port power switching for the AT43USB326 is best imple-
mented in the so-called multiple gang. The Hub Characteristic’s bits in the Hub Descriptor are
set as follows:
Logical Power Switching is Individual, D1D0 = 01
Overcurrent Protection is Individual, D4D3 = 01
When an over-current condition at one of the external ports is detected, the over-current bits of
both external ports are set. The host will switch off power to the external port, but the keyboard
will continue to operate. The external port power is switched on as soon as one port's power is
enabled, but switched off only when the power to both ports is disabled.
Figure 12.
Port Power Management
Suspend and
Resume
The AT43USB326 enters suspend only when requested by the USB host through bus inactiv-
ity for at least 3 ms. The USB hardware would detect this request, sets the GLB_SUSP bit of
SPRSR, Suspend/Resume Register, and interrupts the microcontroller if the interrupt is
enabled. The microcontroller should shut down any peripheral activity and enter the Power
Down mode by setting the SE and SM bits of MCUCR and then executes the SLEEP instruc-
tion. The USB hardware shuts off the oscillator and PLL.
CTL
FLG
IN
OUT
SWITCH
AT43USB326
GND
VCC
PWRN
OVCN
PORT2_POWER
PORT2_GND
PORT3_POWER
PORT3_GND
BUS_POWER
GND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT43USB351M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
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| AT43USB351M-AC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed/ Low-speed USB Microcontroller with ADC and PWM |
| AT43USB353M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB353M_03 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low Cost USB Microcontroller with Hub, ADC and PWM |
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