ST AN3355 APPLICATION NOTE

AN3355

Application note

Designing an application board compatible with either

standard M24LRxx-R or energy-harvesting M24LRxxE-R devices

Introduction

The goal of this application note is to describe how to design application boards accepting
either standard M24LRxx-R or energy-harvesting M24LRxxE-R devices.

May 2011 Doc ID 018544 Rev 2 1/11

www.st.com

Contents AN3355

Contents

1 M24LRxx-R and M24LRxxE-R pin-out comparison . . . . . . . . . . . . . . . . 5

2 Designing a board compatible with both devices . . . . . . . . . . . . . . . . . 6

3 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2/11 Doc ID 018544 Rev 2

AN3355 List of tables

List of tables

Table 1. Compatibility overview (Pin1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2. Compatibility overview (Pin7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3. M24LRxx-R Device Select byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 4. M24LRxxE-R Device Select byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Doc ID 018544 Rev 2 3/11

List of figures AN3355

List of figures

Figure 1. Two families, two pin-outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Typical schematic of an application powered from M24LRxxE-R. . . . . . . . . . . . . . . . . . . . . 6

4/11 Doc ID 018544 Rev 2