USB82642 datasheet(4/64 Pages) MICROCHIP

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USB82642

DS60001253F-page 4

 2012-2021 Microchip Technology Inc.

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INTRODUCTION

Microchip’s USB82642 is designed, fabricated, tested, characterized and qualified for automotive applications.

The USB82642 is a USB 2.0 compliant, hi-speed hub and card reader combo solution. This fully-integrated, single

chip solution provides USB expansion and flash media reader/writer integration. The Microchip USB82642 provides

an ultra fast interface between a USB host and today’s popular flash media formats. The controller allows read/write

capability to flash media including the following:

• Secure DigitalTM (SD)

• SD High CapacityTM (SDHC)

• SD Extended CapacityTM (SDXC)

• MultiMediaCardTM (MMC)

• Embedded MultiMediaCard (eMMC)

The USB82642 offers a versatile, cost-effective and energy-efficient hi-speed hub controller with 2 downstream USB

2.0 ports and an SD/MMC flash media card interface. The dedicated flash media reader is internally attached to a 3rd

downstream port of the hub as a USB compound device. The flash media interface can support sustained transfer rates

exceeding 35 MB/s if the media and host support those rates.

Additionally the USB82642 provides an I2C over USB bridge and an SD over USB bridge. The I2C bridge allows for

control of any I2C device operating at 50 kHz serial clock, while the SD bridge supports the use of SDIO cards.

The USB82642 will attach to an upstream port as either a full-speed or full-/hi-speed hub. The hub supports low-speed,

full-speed, and hi-speed (if operating as a full-/hi-speed hub) downstream devices on all of the enabled downstream

ports.

All required resistors on the USB ports are integrated into the hub. This includes all series termination resistors on D+

and D- pins and all required pull-down and pull-up resistors. The over-current sense inputs for the downstream facing

ports have internal pull-up resistors.

AEC-Q100 compliance: The USB82642 is specifically tailored for use in automotive applications requiring automotive

grade robustness starting with the comprehension of proprietary design for reliability techniques within the silicon IC

itself as well as for the package design.

• Automotive qualified technologies and processes are used to fabricate the products with enhanced monitors to

continuously drive improvements in accordance with Microchip’s zero-dpm methodology.

• Product qualification is focused on customer expectations and exceeds many of the automotive reliability stan-

dards including AEC-Q100.

• Microchip automotive services are provided during the life of the product from a dedicated organization of opera-

tions, quality, and product support personnel specialized in meeting the requirements of the automotive customer.

The USB82642 includes programmable features such as:

PortMap which provides flexible port mapping and disable sequences. The down-

stream ports of a USB82642 hub can be reordered or disabled in any sequence to

support multiple platform designs with minimum effort. For any port that is disabled,

the USB82642 automatically reorders the remaining ports to match the USB host

controller’s port numbering scheme.

PortSwap which adds per-port programmability to USB differential-pair pin loca-

tions. PortSwap allows direct alignment of USB signals (D+/D-) to connectors avoid-

ing uneven trace length or crossing of the USB differential signals on the PCB.

PHYBoost which enables four programmable levels of USB signal drive strength in

downstream port transceivers. PHYBoost attempts to restore USB signal integrity.

The boost graphic shows an example of hi-speed USB eye diagrams before (PHY-

Boost at 0%) and after (PHYBoost at 12%) signal integrity restoration in a compro-

mised system environment.

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