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The USB3300-EZK is a Hi-Speed USB 2.0 ULPI Transceiver manufactured by Microchip Technology.

Specifications:

• Interface: ULPI (UTMI+ Low Pin Interface)
• USB Compliance: USB 2.0 Hi-Speed (480 Mbps), Full-Speed (12 Mbps), and Low-Speed (1.5 Mbps)
• Operating Voltage: 1.8V (core) and 3.3V (I/O)
• Package: 32-pin QFN (5x5 mm)
• Operating Temperature Range: -40°C to +85°C
• Low Power Consumption: Supports suspend/resume modes
• Integrated Termination Resistors: Reduces external component count
• Clock Input: 24 MHz or 60 MHz reference clock
• Compliance: USB-IF certified

Descriptions:

The USB3300-EZK is a highly integrated USB 2.0 transceiver designed for embedded applications requiring a ULPI interface. It provides a low-pin-count connection to USB host or peripheral controllers, supporting all USB 2.0 data rates.

Features:

• ULPI Interface: Reduces pin count compared to UTMI+
• Flexible Clocking: Supports 24 MHz or 60 MHz reference clock
• Integrated USB Termination: Simplifies PCB design
• Low Power Modes: Supports USB suspend/resume
• Industrial Temperature Range: Suitable for harsh environments
• USB-IF Certified: Ensures compliance with USB standards

The USB3300-EZK is commonly used in embedded systems, industrial applications, and consumer electronics requiring USB connectivity.

# USB3300-EZK: Practical Applications, Design Considerations, and Implementation

## Practical Application Scenarios

The USB3300-EZK from Microchip is a high-performance USB 2.0 Hi-Speed (480 Mbps) ULPI transceiver designed for embedded systems requiring robust USB connectivity. Its primary applications include:

1. Embedded Host/Peripheral Devices – The USB3300-EZK is widely used in industrial controllers, medical devices, and consumer electronics where USB host or peripheral functionality is required. Its ULPI (UTMI+ Low Pin Interface) compatibility allows seamless integration with USB-capable microcontrollers and ASICs.

2. USB Hubs and Multi-Port Systems – Due to its low-power operation and support for high-speed data transfer, the IC is ideal for USB hub designs, enabling multiple downstream connections without signal degradation.

3. Automotive Infotainment Systems – The component meets stringent EMI/EMC requirements, making it suitable for automotive applications where reliable USB communication is critical for media transfer and device charging.

4. IoT Gateways and Edge Devices – The USB3300-EZK facilitates high-speed data exchange in IoT applications, supporting firmware updates, sensor data logging, and peripheral connectivity.

## Common Design-Phase Pitfalls and Avoidance Strategies

1. Improper ULPI Interface Configuration – Misalignment between the USB3300-EZK and the host controller’s ULPI timing parameters can lead to communication failures.

• Solution: Verify signal integrity using oscilloscope measurements and adhere to the ULPI specification for setup/hold times.

2. Power Supply Noise Issues – Switching noise from DC-DC converters can degrade USB signal quality.

• Solution: Use low-ESR capacitors near the power pins and implement proper grounding techniques, including a solid ground plane.

3. ESD and Overvoltage Risks – USB ports are exposed to electrostatic discharge (ESD) and voltage transients.

• Solution: Integrate ESD protection diodes (e.g., USBLC6-2SC6) close to the USB connector.

4. Incorrect PCB Layout Practices – Poor routing of USB differential pairs (D+ and D-) can cause signal integrity issues.

• Solution: Maintain 90-ohm differential impedance, minimize trace length mismatches, and avoid sharp bends.

## Key Technical Considerations for Implementation

1. Clock Requirements – The USB3300-EZK requires a 60 MHz reference clock (typically sourced from an external crystal or oscillator). Ensure low-jitter clock signals to prevent USB synchronization errors.

2. Power Sequencing – The IC supports 1.8V and 3.3V operation. Follow the recommended power-up sequence to avoid latch-up conditions.

3. ULPI Signal Termination – Proper termination resistors (22Ω in series with data lines) are essential to minimize reflections in high-speed signaling.

4. Software Driver Compatibility – Confirm that the host controller’s driver stack supports ULPI mode to avoid enumeration failures.

By addressing these factors, designers can maximize the reliability and performance of the USB3300-EZK in their applications.