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USB2514I-HZH

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller

SMSC -> Microchip 

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Table 3.1 USB2514 Pin Descriptions (continued)

SYMBOL

PRTPWR_POL

OCS[4:1]_N

36 QFN 48 QFN

n/a

38

21

28

19

26

17

20

13

16

BUFFER

TYPE

DESCRIPTION

BOOST[1:0], If this strap is enabled by package and

configuration settings (see Table 3.2), this pin will be

sampled at RESET_N negation to determine if all PHY

ports (upstream and downstream) operate at a normal

or boosted electrical level. Also, the active state of the

LEDs will be determined as follows:

See for BOOST values: Section 4.3.1.26, "Register F6h:

Boost_Up" and Section 4.3.1.27, "Register F8h:

Boost_4:0".

BOOST[1:0] = BOOST_IOUT[1:0]

BOOST[1:0] = ‘00’,

LED_B2_N is active high,

LED_B1_N is active high.

BOOST[1:0] = ‘01’,

LED_B2_N is active high,

LED_B1_N is active low.

BOOST[1:0] = ‘10’,

LED_B2_N is active low,

LED_B1_N is active high.

BOOST[1:0] = ‘11’,

LED_B2_N is active low,

LED_B1_N is active low.

IPU

Port Power Polarity strapping

Port Power Polarity strapping determination for the

active signal polarity of the [4:1]PRTPWR pins.

While RESET_N is asserted, the logic state of this pin

will (through the use of internal combinatorial logic)

determine the active state of the [4:1]PRTPWR pins in

order to ensure that downstream port power is not

inadvertently enabled to inactive ports during a

hardware reset.

When RESET_N is negated, the logic value will be

latched internally, and will retain the active signal polarity

for the PRTPWR[4:1] pins.

‘1’ = PRTPWR[4:1]_P/N pins have an active ‘high’

polarity

‘0’ = PRTPWR[4:1]_P/N pins have an active ‘low’

polarity

Warning: Active Low port power controllers may glitch

the downstream port power when system power is first

applied. Care should be taken when designing with

active low components!

Note:

If PRTPWR_POL is not an available pin on the

package, the hub will support active high

power controllers only!

IPU

Over Current Sense

Input from external current monitor indicating an over-

current condition.

{Note: Contains internal pull-up to 3.3V supply}

SMSC USB2514i

11

DATASHEET

Revision 1.98 (11-19-07)

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