UPD72012 datasheet(15/36 Pages) NEC

номер детали	UPD72012

подробное описание детали	HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

PDF	36 Pages

Scroll/Zoom	100%

производитель	NEC [NEC]

домашняя страница	http://www.nec.com/

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15 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

(2/2)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask ROM

code

product

MaxPower

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

µPD72012 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”)

0x32

(PSSEL=“H”)

0x32

(PSSEL=“L”)

0x32

(PSSEL=“H”)

0x32

(PSSEL=“L”)

0x32

(PSSEL=“H”)

(recommen-

ded value)

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