USB3300 datasheet(43/53 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001783B-page 43

USB3300

7.2

Multi-port Applications

To support multiple ports a single USB3300 host can be combined with one of Microchip’s many hub products to expand

the number of ports. Microchip has 2-port, 3-port, 4-port, and 7-port hub designs which can be used to expand the num-

ber of ports in a design.

Using a Microchip hub to expand the number of ports allows a single Link to run several USB devices without a separate

Link to support each USB port. Another advantage of using a Microchip hub is on products where the main board is not

located near the USB ports. The USB3300 can be placed on the main board with the Link ASIC and the hub can be

placed on a separate board next to the USB ports. The only data connection required between the boards is DP and DM.

The CPEN output of the USB3300 is optional and can be used to turn the Hub on or off to lower current when the USB

connection isn’t needed.

7.3

Evaluation Board

An evaluation board, EVB-USB3300, is available for building a prototype system with the USB3300. The evaluation

board provides an industry standard T&MT connector to interface a ULPI Link controller and a Mini-AB connector for

the USB cable. A 500mA fault protected 5V Vbus switch that is controlled by the USB3300 is also included.

7.4

ESD Performance

The USB3300 is protected from ESD strikes. By eliminating the requirement for external ESD protection devices, board

space is conserved, and the board manufacturer is enabled to reduce cost. The advanced ESD structures integrated

into the USB3300 protect the device whether or not it is powered up. When the USB3300 is not powered, the digital I/O

pins are loaded by the ESD structures, and must not be driven by external signals.

7.4.1

HUMAN BODY MODEL (HBM) PERFORMANCE

HBM testing verifies the ability to withstand the ESD strikes like those that occur during handling and manufacturing,

and is done without power applied to the IC. To pass the test, the device must have no change in operation or perfor-

mance due to the event. All pins on the USB3300 provide ±8kV HBM protection.

FIGURE 7-4:

EXPANDING DOWNSTREAM PORTS FOR USB3300 HOST APPLICATIONS

USB3300

CPEN

USBDP0

USBDM0

VBUS_DET

SOC w/

ULPI Link

USB Port 1

USBDP1

USBDN1

DIR

NXT

STP

DATA[7]

DATA[6]

DATA[5]

DATA[4]

DATA[3]

DATA[2]

DATA[1]

DATA[0]

CLOCK

DIR

NXT

STP

DATA[7]

DATA[6]

DATA[5]

DATA[4]

DATA[3]

DATA[2]

DATA[1]

DATA[0]

CLOCK

USB2502

USB Port 2

USBDP2

USBDN2

USB Port 3

USBDP3

USBDN3

USB Port 4

USBDP4

USBDN4

USB Ports 5-7

USBDP5-7

USBDN5-7

USB2507

USB2503

USB2504

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