USB2517 datasheet(11/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 11

USB2517/USB2517I

LED_A[7:1]_N/

PRT_SWP[7:1]

I/O12

Port LED Indicators & Port Swap strapping option

Indicator LED for ports 1-7. Will be active low when LED support is

enabled via EEPROM or SMBus.

If this strap is enabled by package and configuration settings (see

Table 5-2), this pin will be sampled at RESET_N negation to deter-

mine the electrical connection polarity of the downstream USB

Port pins (USB_DP and USB_DM).

Also, the active state of the LED will be determined as follows:

‘0’ = Port Polarity is normal, LED is active high.

‘1’ = Port Polarity (USB_DP and USB_DM) is swapped, LED is

active low.

LED_B[7:4]_N

I/O12

Enhanced Indicator Port 4-7 LED

Enhanced Indicator LED for ports 4-7. Will be active low when LED

support is enabled via EEPROM or SMBus.

LED_B3_N/

GANG_EN

I/O12

Enhanced Port 3 LED, Gang Power, and Over-current Strap

Option

Enhanced Indicator LED for port 3. Will be active low when LED

support is enabled via EEPROM or SMBus.

GANG_EN: Selects between Gang or Individual Port power and

Over-current sensing.

If this strap is enabled by package and configuration settings (see

Table 5-2), this pin will be sampled at RESET_N negation to deter-

mine the mode as follows:

‘0’ = Individual sensing & switching, and LED_B3_N is active high.

‘1’ = Ganged sensing & switching, and LED_B3_N is active low.

TABLE 5-1:

USB2517/USB2517I PIN DESCRIPTIONS (CONTINUED)

Symbol

64 QFN

Buffer Type

Description

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