Designing a board compatible with both devices

AN3355

6/11

Doc ID 018544 Rev 2

2

Designing a board compatible with both devices

The purpose of this application note is to design an application board that accepts either the

standard M24LRxx-R (dual-interface) or the M24LRxxE-R (energy-harvesting) devices.

Let’s see how pin1 and pin7 are used in a typical application based on M24LRxxE-R.

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Pin1: M24LRxxE-R Vout pin, providing a power supply to the application.

This pin is actually connected to the input of the application power supply management

block.

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Pin7: M24LRxxE-R WIP/Busy output.

This pin is connected to one input of the application controller.

Figure 2.

Typical schematic of an application powered from M24LRxxE-R

If we substitute the M24LRxxE-R (offering the Energy harvesting function) with an

M24LRxx-R (without energy-harvesting output), we have to check that the two pins 1 and 7

do not induce malfunction or stress in the application.

Conditions applying to pin1:

The M24LRxx-R pin1 is the E0 input. Its logical value is internally read as:

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or E0=0 when left unconnected (HiZ).