USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 42

• Manufacturer Part Number: USB2640I
• Description: Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
• Manufacturer: Standard Microsystems Corp.

Revision 2.0 (10-03-08)
7.3.3.25
7.3.3.26
7.3.3.27
NUMBER
NUMBER
NUMBER
BIT
BIT
BIT
7:0
7:0
7:0
ECh: Hub Controller Max Current For Self-Powered Operation
EDh: Hub Controller Max Current For Bus-Powered Operation
EEh: Power-On Time
POWER_ON_TIME
HC_MAX_C_SP
HC_MAX_C_BP
BYTE NAME
BYTE NAME
BYTE NAME
Hub Controller Max Current Self-Powered: Value in 2 mA increments that the
Hub Controller Max Current Bus-Powered: Value in 2 mA 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 does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note:
A value of 50 (decimal) indicates 100 mA, which is the default value.
hub consumes from an upstream port (VBUS) when operating as a bus-
powered hub. This value will include the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value will NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) would indicate 100 mA, which is the default value.
Power-On Time: The length of time that it takes (in 2 ms intervals) from the
time the host initiated power-on sequence begins on a port until power is
adequate on that port. System software uses this value to determine how
long to wait before accessing a powered-on port.
The USB 2.0 Specification does not permit this value to exceed 100
mA.
Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
DATASHEET
42
DESCRIPTION
DESCRIPTION
DESCRIPTION
SMSC USB2640i/USB2641i