描述 Description

The USB82514 brings consumer electronics connectivity to cars.?With its automotive-grade quality this Hi-Speed 4-Port Hub has the advantages of: High-performance Low-power Small-footprint solution Fully compatible with USB 2.0 Specification Applications Automotive integrated head unit Automotive consumer connectivity ports Automotive breakout box designs Portable device charging via USB DescriptionThe USB82514 is a versatile, cost-effective and energy-efficient USB 2.0 hub controller. Leveraging Microchip's MultiTRAK technology that delivers industry-leading data throughput in mixed-speed USB environments, the USB82514 is designed for applications that demand low power and a small footprint without compromising performance. The USB82514 has been specifically designed to meet the stringent requirements of the automotive?industry.? Over 30 programmable features, including Microchip's unique PortMap, PortSwap and PHYBoost are designed to aid system designers in simplifying PCB layout and optimizing bill-of-material cost. MultiTRAK technology utilizes a dedicated TT per port to maintain consistent Full-Speed data throughput regardless of the number of active downstream connections. MultiTRAK outperforms conventional USB 2.0 hubs with a single TT in USB Full-Speed data transfers by up to 100%, effectively doubling the amount of data throughput for every downstream port. PortMap provides flexible port mapping and disable sequences. The downstream ports of a USB82514 hub can be reordered or disabled in any sequence to support multiple platforms with a single design. For any port that is disabled, the USB82514 automatically reorders the remaining ports to match the USB host controller’s port numbering scheme. PortSwap adds per-port programmability to USB differential-pair pin locations. PortSwap allows direct alignment of USB signals (D+/D-) to connectors avoiding uneven trace length or crossing of the USB differential signals on the PCB. PHYBoost enables programmable four-level USB signal drive strengths in downstream port transceivers. PHYBoost attempts to restore USB signal integrity that has been compromised by system level variables such as poor PCB layout, long cables, etc. The graphics at the right show an example of Hi-Speed USB eye diagrams before (PHYBoost at 0%) and after (PHYBoost at 12%) signal integrity restoration in a compromised system environment.

特性 Features

High-performance, low-power, small footprint hub controller IC with 4 downstream ports
Specifically designed, fabricated, tested, characterized and qualified for automotive applications
Fully-compatible with the USB 2.0 specification
MultiTRAK? technology: Dedicated Transaction Translator (TT) for every downstream port provides best-in-class performance
PortMap: Flexible port mapping and port disable sequence supports multiple platform designs
PortSwap: Programmable USB differential-pair pin locations ease PCB design by aligning USB signal traces directly to connectors
PHYBoost: Programmable USB transceiver drive strength for recovering signal integrity due to compromised system environment
Enhanced OEM configuration options available through either a single serial I2C EEPROM or SMBus slave port
Customizable Vendor ID, Product ID and Device ID
Easily configurable as 2, 3 or 4 port hub in common PCB layout
Over 30 port configuration options
On-chip Power-on Reset saves bill of materials cost
Integrated 3.3 V to 1.8 V regulator
Enhanced ESD protection performance
36-pin (6 x 6 mm2) QFN lead-free, RoHS-compliant package
Temperature range: -40 °C to +85 °C

應(yīng)用 Application

·Automotive integrated head unit
·Automotive consumer connectivity ports
·Automotive breakout box designs
·Portable device charging via USB