UPD72012 Ver la hoja de datos (PDF) - NEC => Renesas Technology

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UPD72012

HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

NEC => Renesas Technology 

No.

Field

8 MaxPower

µPD72012

Size

(Bytes)

Contents

Value

Standard ROM code

product

003

004

(2/2)

Mask ROM

code

product

1 Shows the maximum current the HUB consumes in

0x32

0x32

0x32

normal operation in hexadecimal notation using

(PSSEL=“L”) (PSSEL=“L”) (PSSEL=“L”)

units of 2 mA.

or

or

or

Since it provides 1 UnitLoad (= 100 mA) to each

0x32

0x32

0x32

port downstream, this is not included in MaxPower. (PSSEL=“H”) (PSSEL=“H”) (PSSEL=“H”)

However, if a non-removable device is connected

(recommen-

downstream, this is included (for details inquire in

ded value)

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.

Data Sheet S13918EJ3V0DS

15

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