WM71004 datasheet, PDF - EEWORLD Datasheet

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WM71004: Description4/8/16Kbit Secure F-RAM Memory with Gen-2 RFID Access; File Size378KB，24 Pages; ManufacturerRamtron International Corporation (Cypress Semiconductor Corporation); Websitehttp://www.cypress.com/

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WM71004 Overview

4/8/16Kbit Secure F-RAM Memory with Gen-2 RFID Access

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Preliminary

WM71004 / WM71008 / WM71016

4/8/16Kbit Secure F-RAM Memory with

Gen-2 RFID Access

DESCRIPTION

The WM710xx is a RFID transponder IC with

nonvolatile memory employing an advanced

ferroelectric process. A ferroelectric random access

memory, or F-RAM, is nonvolatile and performs

reads and writes like a RAM. It provides reliable data

retention for 20 years while eliminating the

complexities, overhead, and system level reliability

problems caused by EEPROM and other nonvolatile

memories.

Unlike EEPROM‟s, the WM710xx write operations

are zero power – there is no power or speed premium

paid for executing writes into the WM710xx as

compared to read power and speed. Operation of the

memory is fully symmetric: it has an equivalent read

and write range.

The WM710xx‟s RFID interface is compatible with

the EPC Class-1 Generation-2 UHF RFID Protocol

for Communications at 860 MHz – 960 MHz,

Version 1.2.0 Specification for RFID Air Interface.

The WM710xx is a two chip configuration offered in

various forms: standard IC package or wafers. All

specifications discussed herein are applicable to the

combined chipset operation.

FEATURES

4/8/16 Kbit Ferroelectric Nonvolatile RAM



Organized as 256/512/1024 x 16 bits



Very High Read/Write Endurance (> 10

)



20-Year Data Retention



Gamma Stability Demonstrated to > 30 kGy



Symmetric Read/Write Operation



Advanced High-Reliability Ferroelectric Process

Interface and Security Features



EPC Class 1 Gen2 (ISO18000-6C) RFID

Compatible Interface (revision 1.2.0)



192-Bit Memory: 96-Bit Electronic Product

Code™ (EPC), 32-Bit Access Password, 32-Bit

KILL Password, 64-Bit TID Memory (Factory

Programmed and Locked)



Inventory, Read, Write and Erase features



Kill Command



Block Permalock Command



Access Command



UHF carrier frequencies from 860 MHz to 960

MHz ISM band, ASK demodulation



Tag-to-reader link frequencies up to 640Kbps



Reader-to-tag asymptotical transmission rates up

to 128Kbps



Supports FM0 and MMS data encoding formats

Custom Features



Stored Address Pointer to Improve Data Write

Speed



Stored Address Pointer Lock



Block Write Command



Variable USER Memory Block Size Support

Ultra Low Power Operation



Memory Read/Write Sensitivity: < -6 dBm (typ.)

Industry Standard Configurations



Industrial Temperature -40 C to +85 C



Bumped Wafers



8-pin UDFN

WM71016

RFID Tag

with F-RAM

RFID

Reader

(Class-1

Gen-2)

Figure 1. System Block Diagram

This is a product that has fixed target specifications but are

subject to change pending characterization results.

Rev. 1.4

May 2011

Ramtron International Corporation

1850 Ramtron Drive, Colorado Springs, CO 80921

(800) 545-FRAM, (719) 481-7000

http://www.ramtron.com

Page 1 of 24

WM710xx – Secure F-RAM with Gen-2 RFID

FUNCTIONAL DESCRIPTION

The WM710xx is a non-volatile memory device with an industry standard UHF RFID interface that enables

processing data in and out of memory as a generic passive RFID transponder. Unlike other transponder ICs,

the WM710xx transponder IC contains high density symmetric read/write F-RAM memory that enables unique

applications of an RFID solution.

When combined with an appropriate antenna design, WM710xx will power up with energy harvested directly

from the RF field. Following an internally generated reset state, the IC configures itself according to pre-

programmed configuration settings that were stored in F-RAM non-volatile memory at wafer probe, packaged

parts test, or end unit transponder personalization at end-user depot. Configuration settings are read out of

memory and applied prior to enabling data transmission in or out of memory.

As specified in the Gen2 standard, the chip receives and processes commands transmitted by the RFID

interrogator (reader). All required and most optional commands are supported. In addition to these,

WM710xx supports a number of custom commands that take advantage of F-RAM‟s unique ultra low power

and symmetrical characteristics.

Referring to Figure 2, the transponder IC‟s consist of an RFID interface, control and authentication logic, F-

RAM memory, and power management unit. The external antenna is connected directly to the RFID interface

where the RF signal is rectified with high efficiency Schottky diode based rectifier. The rectified voltage is

multiplied up within the Schottky array and then regulated to supply power to on-chip resources.

Also included in the RFID Interface is a modulator/demodulator that detects incoming signals and modulates

the input impedance to enable backscattering of returned signals. The control and authentication logic

processes commands to enable access in and out of F-RAM memory.

RFID

Interface

Control and

Authentication

Logic

Power

Management

F-RAM Array

(16Kb)

External

MCU

(Optional)

Figure 2. Block Diagram

Rev. 1.4

May 2011

Page 3 of 24

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