MAX3421E Datasheet, PDF (1/29 Pages) Maxim Integrated Products – USB Peripheral/Host Controller with SPI Interface

19-3953; Rev 0; 2/06
USB Peripheral/Host Controller
with SPI Interface
General Description
The MAX3421E USB peripheral/host controller contains
the digital logic and analog circuitry necessary to
implement a full-speed USB peripheral or a full-/low-
speed host compliant to USB specification rev 2.0. A
built-in transceiver features ±15kV ESD protection and
programmable USB connect and disconnect. An inter-
nal serial interface engine (SIE) handles low-level USB
protocol details such as error checking and bus retries.
The MAX3421E 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 peripheral or host functionality using the simple 3-
or 4-wire SPI interface.
The MAX3421E makes the vast collection of USB
peripherals available to any microprocessor, ASIC, or
DSP when it operates as a USB host. For point-to-point
solutions, for example, a USB keyboard or mouse inter-
faced to an embedded system, the firmware that oper-
ates the MAX3421E can be simple since only a
targeted device is supported.
Internal level translators allow the SPI interface to run at
a system voltage between 1.4V and 3.6V. USB-timed
operations are done inside the MAX3421E with inter-
rupts provided at completion so an SPI master does not
need timers to meet USB timing requirements. The
MAX3421E includes eight 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 MAX3421E operates over the extended -40°C to
+85°C temperature range and is available in a 32-pin
TQFP package (5mm x 5mm) and a 32-pin TQFN pack-
age (5mm x 5mm).
Applications
Embedded Systems
Medical Devices
Microprocessors and
DSPs
Custom USB Devices
Cameras
Desktop Routers
PLCs
Set-Top Boxes
PDAs
MP3 Players
Instrumentation
Features
♦ Microprocessor-Independent USB Solution
♦ Software Compatible with the MAX3420E USB
Peripheral Controller with SPI Interface
♦ Complies with USB Specification Revision 2.0
(Full-Speed 12Mbps Peripheral, Full-/Low-Speed
12Mbps/1.5Mbps Host)
♦ Integrated USB Transceiver
♦ Firmware/Hardware Control of an Internal D+
Pullup Resistor (Peripheral Mode) and D+/D-
Pulldown Resistors (Host Mode)
♦ Programmable 3- or 4-Wire, 26MHz SPI Interface
♦ Level Translators and V_L Input Allow Independent
System Interface Voltage
♦ Internal Comparator Detects V_BUS for Self-
Powered Peripheral Applications
♦ ESD Protection on D+, D-, and VBCOMP
♦ Interrupt Output Pin (Level- or Programmable-
Edge) Allows Polled or Interrupt-Driven SPI
Interface
♦ Eight General-Purpose Inputs and Eight General-
Purpose Outputs
♦ Interrupt Signal for General-Purpose Input Pins,
Programmable Edge Polarity
♦ Intelligent USB 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
♦ Space-Saving Lead-Free TQFP and TQFN
Packages (5mm x 5mm)
Ordering Information
PART
TEMP RANGE ^PIN-
PACKAGE
PKG CODE
MAX3421EEHJ+ -40°C to +85°C 32 TQFP
H32-1
MAX3421EETG+* -40°C to +85°C 32 TQFN-EP** T3255-4
*Future product—contact factory for availability.
**EP = Exposed paddle, connected to ground.
SPI is a trademark of Motorola, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.