STMicroelectronics AN4125 M24LRxxE-R Dual Interface EEPROM Application Note

The M24LRxxE_R is an EEPROM device designed to be accessed via two different interfaces: a wired I²C interface and a standard contactless ISO 15693 RFID interface. The document explains the application and operation principles of M24LRxxE_R, and describes how to manage simultaneous I²C and RF data transfers.

Brand: STMicroelectronics
Category: Memory
Document type: Application Note
Language: English
Pages: 15
File format: PDF
File size: 392 KB
Published: 06 August, 2012
Updated: 29 September, 2023
MD5 checksum: 6F6038D914A0B6634C51104F07E15B7C
PDF: STMicroelectronics AN4125 M24LRxxE-R Dual Interface EEPROM Application Note PDF

About this manual

The document describes the M24LRxxE-R, an EEPROM device accessible via both a wired I2C interface and a contactless ISO 15693 RFID interface. Because these two host controllers are not synchronized, concurrent access attempts can occur. The device includes specific circuitry to handle these potential conflicts.

What's inside

RF - IC arbitration mechanism description
Communications and power supply conditions
Communication arbitration when both channels active
I2C busy states
RF busy states
Arbitration logic
Recommendations for application software

Specifications

Applicable Products	M24LRO4E-R, M24LR16E-R, M24LR64E-R

Frequently asked questions

What happens if an I2C command is transmitted while the device is busy with an RF command?

The I2C command is not decoded by the device.

What happens to the M24LRxxE-R when Vcc is off or not connected?

The device is reset.

What action does the device take if an RF command is transmitted while it is in the I2C busy state?

The RF command is not decoded.

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