UPD72012 datasheet(19/36 Pages) NEC

19 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

(3/4)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

wHubCharacteristics

“0b01”: Monitor overcurrent for each port

individually.

Since this is the setting for a standard

ROM code product (003), a circuit that can

individually control overcurrent protection

functions externally is needed.

If this value is set for a Mask ROM code

when one of the pins CS1 to CS5 detect

overcurrent, Hub reports overcurrent on

per- port basis.

“0b1X”: Shows that there is no overcurrent

protection function. This setting is allowed

only for bus-powered hubs that do not

implement over-current protection.

If this value is set for a Mask ROM code

product, clamp all of the pins CS1 to CS5

to 3.3 V.

Bits 15-5: These bits are reserved in the USB

standard for future extended functions.

For a Mask ROM code product, be sure to

set these bits to “0”.

Caution Be sure to set the values in bits 3 and 0

the same in Mask ROM code product

settings.

0x0009

0x0000

0x00XX

bPowerOn2PwrGood

Shows the time from detecting a device at a port and

starting the power-on sequence until the power

supply stabilizes.

Two milliseconds are taken as one unit. This is 100

ms for the

µPD72012.

0x32

bHubContrCurrent

Shows the maximum current consumption of the

HUB in mA. Note that this value does not show the

rated current consumption value for the

µPD72012

itself.

For a standard ROM code product, “0x50” is applied

for compatibility with the

µPD72011. This value can

be defined for a Mask ROM code product. However,

this value should not be less than the current

consumption value of the

µPD72012 that is

described in 3. ELECTRICAL SPECIFICATIONS.

0x50

0xXX

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