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參數(shù)資料
| 型號： | μPD72012 |
| 廠商： | NEC Corp. |
| 英文描述： | Hub Controller For USB(集線器控制器) |
| 中文描述： | 集線器控制器的USB（集線器控制器） |
| 文件頁數(shù)： | 15/40頁 |
| 文件大?。?/td> | 342K |
| 代理商： | ΜPD72012 |
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Preliminary Data Sheet S13918EJ2V0DS00
15
μ
PD72012
(2/2)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
User ROM
code
product
8
MaxPower
1
Shows the maximum current the HUB consumes in
normal operation in hexadecimal notation using
units of 2 mA.
Since it provides 1 UnitLoad (= 100 mA) to each
port downstream, this is not included in MaxPower.
However, if a non-removable device is connected
downstream, this is included (for details inquire in
the USB-IF).
Switching the input level of the PSSEL pin changes
the value that is returned. In short, two-way setting
of the
μ
PD72012 is possible for “self-power” and
“bus power”.
For a User ROM code product, if only one value is
set in this field, it returns the same value regardless
of the PSSEL pin. When performing 2-way setting,
give the PSSEL input level with each setting.
For a “bus power” setting (PSSEL=“H”), normally set
this to 0x32 (100 mA). However, when making a
subordinate port a non-removable port, add the
current consumed by the device connected to that
port when you set the MaxPower value.
For a “self-power” setting (PSSEL=“L”), 0x32 (100
mA) is fixed.
0x32
(PSSEL=“L”)
or
0x32
(PSSEL=“H”)
0x32
(PSSEL=“L”)
or
0x32
(PSSEL=“H”)
0x32
(PSSEL=“L”)
or
0x32
(PSSEL=“H”)
(recommen-
ded value)
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