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USB82640 数据表(PDF) 28 Page - Microchip Technology

部件名 USB82640
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

USB82640 数据表(HTML) 28 Page - Microchip Technology

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USB82640
DS60001312A-page 28
 2010-2015 Microchip Technology Inc.
7.3.2.11
A4h-A5h: LUN 0 Power Configuration
The USB82640 has one internal FET which can be utilized for card power. Please reference to Section 7.3.4.9, "14Ch-
17Bh: Reserved," on page 42 for information on the other internal FET. The settings are stored in NVSTORE and pro-
vide 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.
7.3.2.12
A6h-A7h: Reserved
7.3.2.13
A8h: LED Blink Interval (1 byte)
7.3.2.14
A9h: Blink Duration
TABLE 7-4:
FET CONFIGURATION
FET
Type
Bits
Bit Type
Description
0FET Lo
Byte
3:0
Low Nibble
rsvd
1
7:4
High Nibble
2FET 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
1:0
rsvd
Bit
Name
Description
7:0
LED_BLK_INT
The blink rate is programmable in 50 ms intervals. The high bit (7) indicates
an idle state:
0
: off
1
: on
The remaining bits (6:0) are used to determine the blink interval up to a max
of 128 x 50 ms.
Bit
Name
Description
7:0
LED_BLK_DUR
LED Blink After Access
This byte is used to designate the number of seconds that the GPIO 1 LED
will continue to blink after a drive access. Setting this byte to 05 will cause the
GPIO 1 LED to blink for 5 seconds after a drive access.



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