參數(shù)資料
型號(hào)： UPD720012
廠(chǎng)商： NEC Corp.
英文描述： HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
中文描述： 集線(xiàn)器控制器通用串行總線(xiàn)
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 414K
代理商： UPD720012
Data Sheet S13918EJ3V0DS
15
μ
PD72012
(2/2)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
Mask 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”.
Mask ROM code product
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. On the
other hand, 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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