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General Description

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 builtin 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.

Benefits and Features

● Simplifies Adding USB to Any System

??? ? Microprocessor-Independent USB Solution

??? ? Complies with USB Specification Revision 2.0 (Full-Speed Operation)

??? ? Integrated Full-Speed USB Transceiver

??? ? Firmware/Hardware Control of an Internal D+ Pullup Resistor

??? ? Programmable 3 or 4-Wire 26MHz SPI Interface

??? ? Intelligent USB Serial-Interface Engine (SIE)

??? ? Automatically Handles USB Flow Control and Double Buffering

??? ? Handles Low-Level USB Signaling Details

??? ? Includes Timers for USB Time-Sensitive Operations, So SPI Master Does Not Need to Time Events

??? ? Four General-Purpose Inputs and Four GeneralPurpose Outputs

● Internal Comparator Detects VBUS for Self-Powered Applications

● Interrupt Output Pin (Level or Programmable Edge) Allows Polled or Interrupt-Driven SPI Interface

● Double-Buffered Data Endpoints Increase Throughput by Allowing the SPI Master to Transfer Data Concurrently with USB Transfers Over the Same Endpoint

??? ? Built-In Endpoint FIFOs

??? ? EP0: CONTROL (64 Bytes)

??? ? EP1: OUT, Bulk or Interrupt, 2 x 64 Bytes (Double-Buffered)

??? ? EP2: IN, Bulk or Interrupt, 2 x 64 Bytes (Double-Buffered)

??? ? EP3: IN, Bulk or Interrupt (64 Bytes)

● SETUP Data Has Its Own 8-Byte FIFO, Simplifying Firmware

● ESD Protection on D+, D-, and VBCOMP Improves System Reliability

Applications

● Cell Phones

● PC Peripherals

● Microprocessors and DSPs

● Custom USB Devices

● Cameras

● Desktop Routers

● PLCs

● Set-Top Boxes

● PDAs

● MP3 Players

● Instrumentation