USB2502 SMSC Corporation, USB2502 Datasheet - Page 23
USB2502
Manufacturer Part Number
USB2502
Description
2-Port USB 2.0 Hub Controller
Manufacturer
SMSC Corporation
Datasheet
1.USB2502.pdf
(44 pages)
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2-Port USB 2.0 Hub Controller
Datasheet
SMSC USB2502
5.2.3.9
5.2.3.10
5.2.3.11
NUMBER
NUMBER
NUMBER
BIT
BIT
BIT
7:0
7:0
7:0
EEPROM Offset B(h) - Max Power For Self Powered Operation
EEPROM Offset C(h) - Max Power For Bus Powered Operation
EEPROM Offset D(h) - Hub Controller Max Current For Self Powered Operation
HC_MAX_C_SP
MAX_PWR_SP
MAX_PWR_BP
BIT NAME
BIT NAME
BIT NAME
Hub Controller Max Current Self-Powered: Value in 2mA increments that the
Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA.
Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
A value of 50 (decimal) indicates 100mA.
Hub consumes from an upstream port (VBUS) when operating as a self-
powered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
DATASHEET
23
DESCRIPTION
DESCRIPTION
DESCRIPTION
Revision 2.1 (12-06-06)