CYUSB3014 datasheet(13/38 Pages) CYPRESS

13 / 38 page

PRELIMINARY

CYUSB3014

Document Number 001-52136 Rev. *H

Page 13 of 38

Configuration Options

Configuration options are available for specific usage models.

Contact Cypress Applications/Marketing for details.

Digital I/Os

EZ-USB FX3 provides firmware controlled pull up or pull down

resistors internally on all digital I/O pins. The pins can be pulled

high through an internal 50 k

Ω resistor or can be pulled low

through an internal 10 k

Ω resistor to prevent the pins from

floating. The I/O pins may have the following states:

■ Tristated (High-Z)

■ Weak Pull up (via internal 50 kΩ)

■ Pull down (via internal 10 kΩ)

■ Hold (I/O hold its value) when in low power modes

■ The JTAG signals TDI, TMC, TRST# signals have fixed 50 kΩ

internal pull-ups & the TCK signal has a fixed 10 k

Ω pull down

resistor.

GPIOs

EZ-USB allows for a flexible pin configuration both on the GPIF

II and the serial peripheral interfaces. Any unused control pins

on the GPIF II interface may be used as GPIOs. Similarly, any

unused pins on the serial peripheral interfaces may be

configured as GPIOs. Please refer to the Pin List for pin config-

uration options.

All GPIF II and GPIO pins support an external load of up to 16pF

per pin.

EMI

EZ-USB FX3 meets EMI requirements outlined by FCC 15B

(USA) and EN55022 (Europe) for consumer electronics.

EZ-USB FX3 can tolerate reasonable EMI conducted by

aggressor outlined by these specifications and continue to

function as expected.

System Level ESD

EZ-USB FX3 has built-in ESD protection on the D+, D-, GND

pins on the USB interface. The ESD protection levels provided

on these ports are:

■ ± 2.2 KV Human Body Model (HBM) based on JESD22-A114

Specification

■ ± 6 KV Contact Discharge and ± 8 KV Air Gap Discharge based

on IEC61000-4-2 level 3A

■ ± 8 KV Contact Discharge and ± 15 KV Air Gap Discharge

based on IEC61000-4-2 level 4C.

This protection ensures the device will continue to function after

ESD events up to the levels stated.

The SSRX+, SSRX-, SSTX+, SSTX- pins only have up to +/-

2.2KV Human Body Model (HBM) internal ESD protection.

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