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USB2240II-AEZG Datasheet(PDF) 22 Page - Microchip Technology |
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USB2240II-AEZG Datasheet(HTML) 22 Page - Microchip Technology |
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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 1 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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