UPD72012 Ver la hoja de datos (PDF) - NEC => Renesas Technology
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UPD72012 Datasheet PDF : 36 Pages
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µPD72012
No.
Field
3 wHubCharacteristics
Size
(Bytes)
Contents
2
“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”.
Value
Standard ROM code
product
003
004
0x0009 0x0000
(3/4)
Mask
ROM code
product
0x00XX
5 bPowerOn2PwrGood
6 bHubContrCurrent
Caution Be sure to set the values in bits 3 and 0
the same in Mask ROM code product
settings.
1 Shows the time from detecting a device at a port and 0x32
starting the power-on sequence until the power
supply stabilizes.
Two milliseconds are taken as one unit. This is 100
ms for the µPD72012.
1 Shows the maximum current consumption of the
0x50
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.
0x32
0x50
0x32
0xXX
Data Sheet S13918EJ3V0DS
19
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