USB2517 datasheet(14/58 Pages) MICROCHIP

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USB2517/USB2517I

DS00001598B-page 14

 2013-2016 Microchip Technology Inc.

MISC

XTAL1/

CLKIN

ICLKx

Crystal Input/External Clock Input

24MHz crystal or external clock input.

This pin connects to either one terminal of the crystal or to an

external 24MHz clock when a crystal is not used.

XTAL2

OCLKx

Crystal Output

24MHz Crystal

This is the other terminal of the crystal. It can be treated as a no

connect when an external clock source is used to drive XTAL1/

CLKIN. This output must not be used to drive any external circuitry

other than the crystal circuit.

RESET_N

RESET Input

The system can reset the chip by driving this input low. The mini-

mum active low pulse is 1

s.

When the RESET_N pin is pulled to VDD33, the internal POR

(Power on Reset) is enabled and no external reset circuitry is

required. The internal POR holds the internal logic in reset until the

power supplies are stable.

SUSP_IND/

LOCAL_PWR/

NON_REM0

I/O12

Active/Suspend status LED or Local-Power & Non-Removable

Strap Option

Suspend Indicator: Indicates the USB state of the hub.

‘negated’ = Unconfigured or configured and in USB suspend

‘asserted’ = Hub is configured, and is active (i.e., not in suspend)

Local Power: Detects availability of local self-power source.

Low = Self/local power source is NOT available (i.e., Hub gets all

power from the upstream USB VBus).

High = Self/local power source is available.

NON_REM0 Strap Option:

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

Table 5-2, "USB2517I SMBUS or EEPROM Interface Behavior"),

this pin will be sampled (in conjunction with NON_REM1) at

RESET_N negation to determine if ports [3:1] contain permanently

attached (non-removable) devices. Also, the active state of the

LED will be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable, and the LED is

active high

NON_REM[1:0] = ‘01’, Port 1 is non-removable, and the LED is

active low

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the

LED is active high

NON_REM[1:0] = ‘11’, Ports 1, 2 & 3 are non-removable, and the

LED is active low

TABLE 5-1:

USB2517/USB2517I PIN DESCRIPTIONS (CONTINUED)

Symbol

64 QFN

Buffer Type

Description

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