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USB82642 数据表(PDF) 27 Page - Microchip Technology

部件名 USB82642
功能描述  Automotive USB 2.0 Hub and Flash Media Card Controller Combo
PDF  64 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB82642 数据表(HTML) 27 Page - Microchip Technology

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 2012-2021 Microchip Technology Inc.
DS60001253F-page 27
USB82642
7.5.2.11
A4h-A5h: LUN 0 Power Configuration
The USB82642 has one internal FET which can be utilized for card power. The settings are stored in NVSTORE and
provide the following features:
1.
A card can be powered by an external FET or by an internal FET.
2.
The power limit is set to 200 mA default for the internal FET, but can be set to 100 mA.
Each media uses two bytes to store its LUN power configuration. Bit 3 selects between internal or external. For internal
FETs bits 0 through 2 are used for the power limit. Only 2 of the possible 8 values are currently specified.
7.5.2.12
A6h-BEh: Reserved
7.5.3
DEVICE ID STRINGS
7.5.3.1
BFh-C5h: Device 3 Identifier String
7.5.3.2
C6h-CDh: Inquiry Vendor String
TABLE 7-4:
FET CONFIGURATION
FET
Type
Bits
Bit Type
Description
0
FET Lo
Byte
3:0
Low Nibble
rsvd
1
7:4
High Nibble
2
FET Hi
Byte
3:0
Low Nibble
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
3
7:4
High Nibble
rsvd
Byte
Name
Description
25:0
rsvd
Byte
Name
Description
6:0
DEV3_ID_STR
These bytes are used to specify the LUN descriptor returned by the device.
These bytes are used in combination with the LUN to device mapping bytes
in applications where the OEM wishes to reorder and rename the LUNs. If
this device is configured to be part of a COMBO LUN then this string is
ignored for the appropriate CLUNx_ID_STR.
Byte
Name
Description
7:0
INQ_VEN_STR
If bit 4 of the 1st attribute byte is set, the device will use these strings in
response to a USB inquiry command, instead of the USB descriptor manufac-
turer and product ID strings.



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