AT43312A-SC SL383 Atmel, AT43312A-SC SL383 Datasheet - Page 8

• Manufacturer Part Number: AT43312A-SC SL383
• Manufacturer: Atmel

Specifications of AT43312A-SC SL383

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Package Type: SOIC
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / RoHS Status: Not Compliant

Bus Powered Mode
8
AT43312A
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
PS5
POWER SUPPLY
5V OUTPUT
GND
U1
R1
47K
U2
LPSTAT
IN
SWITCH
AT43312A
OUT
PORT_POWER
GND
1255G–USB–05/06
To
Downstream
Device