USB2517 datasheet(12/58 Pages) MICROCHIP

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USB2517/USB2517I

DS00001598B-page 12

 2013-2016 Microchip Technology Inc.

LED_B[2:1]_N/

BOOST[1:0]

I/O12

Enhanced Port [2:1] LED & PHY Boost strapping option

Enhanced Indicator LED for ports 1 & 2. Will be active low when

LED support is enabled via EEPROM or SMBus.

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

settings (see Table 5-2), 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 Section 7.2.1.26, "Register F6h: Boost_Up" and Section

7.2.1.28, "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.

OCS[7:1]_N

IPU

Over-current Sense

Input from external current monitor indicating an over-current con-

dition.

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

RBIAS

I-R

USB Transceiver Bias

A 12.0k

 (+/- 1%) resistor is attached from the ground to this pin

to set the transceiver’s internal bias settings.

TABLE 5-1:

USB2517/USB2517I PIN DESCRIPTIONS (CONTINUED)

Symbol

64 QFN

Buffer Type

Description

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