USB2517 datasheet(28/58 Pages) MICROCHIP

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USB2517/USB2517I

DS00001598B-page 28

 2013-2016 Microchip Technology Inc.

7.2.1.14

7.2.1.15

7.2.1.16

7.2.1.17

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

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.

Bit

Number

Bit Name

Description

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-pow-

ered 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 periph-

eral 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.

Bit

Number

Bit Name

Description

7:0

HC_MAX_C_BP

Hub Controller Max Current Bus-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a bus-pow-

ered 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 100mA, which is the default value.

Bit

Number

Bit Name

Description

7:0

POWER_ON_TIME

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 sta-

ble on that port.

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