USB Host and Peripheral Controller Has 26MHz SPI Interface
SUNNYVALE, CA-February 21, 2006-Maxim Integrated
Products (NASDAQ: MXIM) introduces the MAX3421E,
an USB host and peripheral controller with an
SPI™ interface. This device integrates digital
logic and analog circuitry to implement a
full-speed (12Mbps) USB host or peripheral
control compliant to the USB specification 2.0.
The MAX3421E makes it easy to add USB host
capabilities to any microprocessor. Embedded
systems with USB host capability can interface to
inexpensive USB keyboards and mice, upload
firmware from USB FLASH drives, or take advantage
of the capabilities of the large number of USB
devices available. The MAX3421E can also operate
in the USB peripheral mode, and is software
compatible with the Company's MAX3420E USB
peripheral controller with SPI interface.
The MAX3421E integrates a ±15kV ESD-protected USB
transceiver, an USB serial interface engine
(SIE), double-buffered endpoint memories, an SPI
slave interface, and software-controlled USB
pullup and pulldown resistors. The integrated USB
transceiver supports full-speed (12Mbps) and
low-speed (1.5Mbps) USB in the host mode and
full-speed USB as a peripheral. The SIE handles
low-level USB protocol details such as automatic
NAK until ready, bit stuffing, CRC
generation/checking, bus retries, automatic
SOF/keep-alive generation, and USB hub support in
the host mode.
The MAX3421E operates using a register set
accessed by the SPI interface, which operates up
to 26MHz. Any SPI master (microprocessor, ASIC,
DSP, etc.) can add USB functionality using the
simple 3- or 4-wire interface. A programmable
interrupt output can be used to reduce or
eliminate microprocessor polling. Integrated
logic-level translators allow the SPI interface
to operate at a system voltage between 1.4V and
3.6V. Additionally, eight general-purpose inputs
and outputs allow any microprocessor that uses
I/O pins to implement the SPI interface to
reclaim those pins and gain additional ones. For
time-critical operations such as OTG signaling, a
second interrupt pin can be dedicated to the
eight general-purpose inputs, each of which can
cause an interrupt.
The MAX3421E operates over the extended
temperature range (-40 degrees Celsius to +85
degrees Celsius). This device is available in 5mm
x 5mm, 32-pin TQFP and 5mm x 5mm, 32-pin TQFN*
packages. Prices start at $3.47 (1000-up, FOB
USA).
SPI is a trademark of Motorola, Inc.
* Future product-contact factory for availability.
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