Features: 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
Level Translators and VL Input Allow Independent System Interface Voltage
Internal Comparator Detects VBUS for Self-Powered Applications
ESD Protection on D+, D-, and VBCOMP
Interrupt Output Pin (Level or Programmable Edge) Allows Polled or Interrupt-Driven SPI Interface
Intelligent USB Serial Interface Engine (SIE) Automatically Handles USB Flow Control and Double Buffering Handles Low-Level USB Signaling Details Contains Timers for USB Time-Sensitive Operations So SPI Master Does Not Need to Time Events
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)
Double-Buffered Data Endpoints Increase Throughput by Allowing the SPI Master to Transfer Data Concurrently with USB Transfers Over the Same Endpoint
SETUP Data Has Its Own 8-Byte FIFO, Simplifying Firmware
Four General-Purpose Inputs and Four General- Purpose Outputs
Space-Saving TQFP and TQFN Packages
ApplicationCell Phones PLCs
PC Peripherals Set-Top Boxes
Microprocessors and PDAs
DSPs MP3 Players
Custom USB Devices Instrumentation
Cameras
Desktop Routers
Pinout
Specifications(All voltages referenced to GND, unless otherwise noted.)
VCC ......................................................................... -0.3V to +4V
VL .............................................................................-0.3V to +4V
VBCOMP ...................................................................-0.3V to +6V
D+, D-, XI, XO .............................................-0.3V to (VCC + 0.3V)
SCLK, MOSI, MISO,SS, RES, GPOUT3GPOUT0,
GPIN3GPIN0, GPX, INT ...............................-0.3V to (VL + 0.3V)
Continuous Power Dissipation (TA = +70°C)
24-Pin TQFN (derate 20.8mW/°C above +70°C) .........1667mW
32-Pin TQFP (derate 20.7mW/°C above +70°C)..........1653mW
Operating Temperature Range ........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range .........................-65°C to +150°C
Lead Temperature (soldering, 10s) ...............................+300°CDescriptionThe 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 SIE (serial-interface engine) 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 TQFP package (7mm x 7mm) and a space-saving 24- pin TQFN package (4mm x 4mm).
MAX3420E Data Sheet
