The MAX3420E contains the digital logic and analog
circuitry necessary to implement a full-speed USB
peripheral compliant to USB specification rev 2.0. A
built-in full-speed transceiver features ±15kV ESD protection
and programmable USB connect and disconnect.
An internal serial-interface engine (SIE) handles
low-level USB protocol details such as error checking
and bus retries. The MAX3420E operates using a register
set accessed by an SPI™ interface that operates up
to 26MHz. Any SPI master (microprocessor, ASIC, DSP,
etc.) can add USB functionality using the simple 3- or
4-wire SPI interface.
Internal level translators allow the SPI interface to run at
a system voltage between 1.71V and 3.6V. USB timed
operations are done inside the MAX3420E with interrupts
provided at completion so an SPI master does not
need timers to meet USB timing requirements. The
MAX3420E includes four general-purpose inputs and
outputs so any microprocessor that uses I/O pins to
implement the SPI interface can reclaim the I/O pins
and gain additional ones.
The MAX3420E operates over the extended -40°C to
+85°C temperature range and is available in a 32-pin
LQFP package (7mm x 7mm) and a space-saving 24-pin TQFN package (4mm x 4mm).
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