USB2240 datasheet(22/43 Pages) MICROCHIP

22 / 43 page

USB224X

DS00001979A-page 22

 2010 - 2015 Microchip Technology Inc.

7.2.3.15

5Fh: USB Product String Descriptor Type

7.2.3.16

60h-99h: USB Product String Option

7.2.3.17

9Ah: USB BmAttribute (1 byte)

7.2.3.18

9Bh: USB MaxPower (1 byte)

Byte

Name

Description

USB_PRD_STR

_TYP

USB product string descriptor type as defined by Section 9.6.7 “String” of the

USB 2.0 Specification (Revision 2.0, 2000). This field is the “bDescriptorType”

which is a constant value associated with a string descriptor type.

Byte

Name

Description

59:2

USB_PRD_STR

This string will be used during the USB enumeration process in the Windows®

operating system. Maximum string length is 29 characters.

Bit

Name

Description

7:0

USB_BM_ATT

Self- or Bus-Power: Selects between self- and bus-powered operation.

The hub is either self-powered (draws less than 2 mA of upstream bus power)

or bus-powered (limited to a 100 mA maximum of upstream power prior to

being configured by the host controller).

When configured as a bus-powered device, the Microchip device consumes

less than 100 mA of current prior to being configured. After configuration, the

bus-powered Microchip device (along with all associated device circuitry, any

embedded devices if part of a compound device, and 100 mA per externally

available downstream port) must consume no more than 500 mA of upstream

VBUS current. The current consumption is system dependent, and the OEM

must ensure that the USB 2.0 Specification is not violated.

When configured as a self-powered device, <1 mA of upstream VBUS current

is consumed and all ports are available, with each port being capable of

sourcing 500 mA of current.

80 = Bus-powered operation (default)

C0 = Self-powered operation

A0 = Bus-powered operation with remote wake-up

E0 = Self-powered operation with remote wake-up

Bit

Name

Description

7:0

USB_MAX_PWR

USB Max Power per the USB 2.0 Specification. Do NOT set this value greater

than 100 mA.

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