AT43312A-AC(2004) データシートの表示（PDF） - Atmel Corporation

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AT43312A-AC
(Rev.:2004)

Self- and Bus- powered USB Hub Controller

Atmel Corporation 

Bus Powered Mode

In the bus powered mode, all the power for the hub itself as well as the downstream

ports is supplied by the root hub or upstream hub through the USB. Only 100 mA is

available for each of the hub’s downstream devices and therefore only low power

devices are supported.

The power switch and overcurrent protection works exactly like the self-powered mode,

except that the allowable switch resistance is higher: 700 mΩ or less under the worst

case condition.

The diagrams of Figure 2 and Figure 3 show examples of the power supply and man-

agement connections for a typical AT43312A port in the self-powered mode and bus

powered mode.

Figure 2. Self-powered Hub Power Supply

BUS_POWER

GND

U1

PS5

POWER SUPPLY

5V OUTPUT

GND

AT43312A

LPSTAT

R1

47K

U2

PORT_POWER

IN

OUT

To

SWITCH

GND

Downstream

Device

8 AT43312A

1255F–USB–3/04

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