In modern electronic systems, USB interfaces are found almost everywhere. From consumer electronics to industrial automation, from embedded platforms to in-vehicle infotainment, USB 2.0 remains a widely used standard. It delivers stable high-speed communication. It also provides backward compatibility and broad device support. These make it an ideal bridge between host controllers and peripherals.
To ensure stable USB 2.0 performance, a reliable physical layer (PHY) chip is essential. The USB3320C-EZK-TR from Microchip is a compact, industrial-grade USB 2.0 PHY. It offers a stable and flexible high-speed interface across various platforms.
1. Device Overview
The USB3320C-EZK-TR supports USB 2.0 High-Speed (480 Mbps) and Full-Speed (12 Mbps) modes. It works with EHCI and OHCI controller standards. Communication is based on ULPI (UTMI+ Low Pin Interface), which uses fewer pins than traditional UTMI. This improves routing, reduces pin usage, and is ideal for space-constrained embedded designs.
The chip comes in a small QFN-32 (5×5 mm) package. It is RoHS-compliant and suitable for automated assembly. Originally developed by SMSC, the device is now part of Microchip’s portfolio. It is still in active production and widely used in consumer, industrial, and automotive products.
2. Key Advantages: Why Choose USB3320C-EZK-TR?
1) High-Speed Performance and Multi-Mode Support
The chip supports USB 2.0 High-Speed mode at 480 Mbps. This is suitable for video, audio, firmware updates, and large data transfers. It also includes logic for Device, Host, and OTG modes. When paired with an OTG-capable controller, it allows easy role switching.
2) ULPI Interface for Easier Integration
ULPI reduces pin count from 16+ (UTMI) to 12. It uses a serialized bus for commands and data. This saves I/O resources and lowers PCB complexity. It also helps reduce cost.
ULPI is open and well-supported. It works with many SoCs such as TI AM335x, NXP i.MX6, STM32MP1, and Allwinner A64. Designers can integrate USB3320C early in the development cycle.
3) Flexible Power Supply Options
The chip supports I/O voltages of 1.8V, 2.5V, and 3.3V. A built-in regulator enables operation from a single 3.3V source. This eliminates external LDOs and simplifies the power design. It also avoids level-shifting between host and PHY.
4) Industrial-Grade Reliability
USB3320C-EZK-TR works over –40°C to +85°C. It tolerates harsh environments such as cold climates or high-vibration systems. Built-in ESD protection (±2kV–±4kV HBM) ensures stability. EMI-optimized layout helps protect against interference and external noise.
3. Package, Electrical Specs & Design Tips
This device uses a QFN-32 package with a thermal pad and solid GND ring. It ensures good thermal dissipation and clean signal return paths.
Key Electrical Specs:
- I/O Voltage: 1.8V / 2.5V / 3.3V; Core voltage: 3.3V
- Data Interface: ULPI compliant; up to 60 MHz clock
- USB Modes: Supports Host, Device, OTG; with VBUS and ID detection
- Power Control: Includes suspend/resume logic for low power modes
- Protection: ESD protection on D+/D− lines for signal integrity
Layout Guidelines:
Route USB D+/D− with 90Ω ±10% differential impedance. Keep the pair length-matched.
Use 0402 filters on VBUS and ID lines to block voltage spikes.
Ensure the thermal pad is fully soldered for better heat transfer and grounding.
4. Application Examples
a) Embedded Systems
In Linux or RTOS-based designs, USB3320C provides USB Host or OTG functions. For example, with STM32MP1, it connects to the ULPI port and supports USB-A connectors. Devices like printers, Wi-Fi modules, or webcams can then connect easily.
b) Industrial Devices
For industrial terminals, gateways, and HMI systems, USB3320C offers reliable USB links. Its strong EMI immunity and wide temperature range ensure stable performance.
c) Consumer Electronics
This chip is used in multimedia players, set-top boxes, and storage devices. It enables high-speed data transfer, system updates, and external peripheral support.
d) Automotive Systems
In infotainment systems, USB3320C serves as a bridge between head units and passenger ports. It supports fast USB charging and data access. It also complies with automotive power and EMC standards.
USB3320C-EZK-TR combines high performance, compact size, and wide compatibility. It suits many system types—from evaluation boards to production products. It fits consumer, industrial, and automotive needs.
For engineers, it is an efficient, reliable design choice. For buyers and managers, it offers long-term supply, flexible sourcing, and competitive pricing.
For datasheets, schematics, or samples, contact WIN SOURCE—a trusted global component distributor. We help you build reliable, high-speed USB designs with confidence.
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