CYUSB306X datasheet(6/37 Pages) CYPRESS

6 / 37 page

CYUSB306X

Document Number: 001-87516 Rev. *L

Page 6 of 37

USB Interface

CX3 complies with the following specifications and supports the

following features:

■ Supports USB peripheral functionality compliant with USB 3.0

Specification, Revision 1.0, and is also backward compatible

with the USB 2.0 Specification.

■ As a peripheral, CX3 is capable of SuperSpeed, High-Speed,

and Full-Speed.

■ Supports up to 16 IN and 16 OUT endpoints

■ Supports the USB 3.0 Streams feature

■ As a USB peripheral, CX3 supports USB-attached storage

(UAS), USB Video Class (UVC), and Media Transfer Protocol

(MTP) USB peripheral classes. As a USB peripheral, all other

device classes are supported only in pass-through mode when

handled entirely by a host processor external to the device.

Figure 2. USB Interface Signals

ReNumeration

Because of CX3’s soft configuration, one chip can take on the

identities of multiple distinct USB devices.

When first plugged into USB, CX3 enumerates automatically

with the Cypress Vendor ID (0x04B4) and downloads the

firmware and USB descriptors over the USB interface. The

downloaded firmware executes an electrical disconnect and

connect. CX3 enumerates again, this time as a device defined

by the downloaded information. This patented two-step process,

called ReNumeration, happens instantly when the device is

plugged in.

VBUS Overvoltage Protection

The maximum input voltage on CX3's VUSB pin is 6 V. A charger

can supply up to 9 V on VUSB. In this case, an external

overvoltage protection (OVP) device is required to protect CX3

from damage on VUSB. Figure 3 shows the system application

diagram with an OVP device connected on VUSB. Refer to DC

Specifications on page 17 for the operating range of VUSB.

Note: The VBUS pin of the USB connector should be connected

to the VUSB pin of CX3.

Figure 3. System Diagram with OVP Device For VUSB

EZ-USB CX3

VUSB

SSRX-

SSRX+

SSTX-

SSTX+

D-

D+

POWER SUBSYSTEM

EZ-USB CX3

VUSB

GND

SSRX-

SSRX+

SSTX-

SSTX+

D-

D+

OVP device

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