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July 2010Doc ID 17761 Rev 11/16
AN3250
Application note
M24LR64-R
Multi-bank reference design description and settings
1 Introduction
The M24LR64-R multi-bank reference design has been created to help users increase the memory density of their Dual Interface EEPROM, and has been designed in a way that will minimize the antenna size and the I²C interface footprint on the PCB.STMicroelectronics has prepared two reference designs:
●ANT4-M24LR-A is a 2-bank reference design with a 128-Kbit EEPROM user memory ●
ANT5-M24LR-A is a 4-bank reference design with a 256-Kbit EEPROM user memory
The basic principle is to connect several M24LR64-R devices in parallel on the same I²C bus (in compliance with I²C specifications) and for them to share one single antenna.This application note describes how the M24LR64-R Multi-Bank reference design works from the schematics and design perspective, and explains how to configure and use it.
Figure 3.
Design overview
Figure 1.
ANT4-M24LR-A design
Figure 2.
ANT5-M24LR-A design
Contents AN3250
Contents
1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2Designing an M24LR64-R multi-bank application . . . . . . . . . . . . . . . . . 3
2.1Accessing several EEPROMs on the same I2C bus . . . . . . . . . . . . . . . . . 3
2.2Connecting several M24LR64-R devices on the same inductive antenna . 5
3Setting up a Multi-Bank application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1Basic principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.1Microcontroller's perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.2RF reader's perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.3Overall perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2Setting up the Multi-Bank design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2.1Microcontroller only is available during setup . . . . . . . . . . . . . . . . . . . . 12
3.2.2RFID reader only is available during setup . . . . . . . . . . . . . . . . . . . . . . 13
3.2.3Both Microcontroller and RFID reader are available during setup . . . . . 14 4Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16Doc ID 17761 Rev 1