基于MLX90129的13.56MHz RFID設計方案

MLX90129是Melexis公司的13.56MHz 傳感器標簽/數據采集IC,它把用于外部電阻傳感器的精密數據采集和廣泛外設組合在一起,存取和控制通過ISO15693 RFID前端或主/從SPI端口進行,除了13.56MHz調諧天線外不需要其它元件. MLX90129具有帶存取保護的4kb EEPROM,以及單獨使用的數據采集模式,主要用在冷鏈監視,財產管理和監視,建筑物自動化以及工業,醫療和住宅區控制與監視.本文介紹MLX90129主要特性,方框圖,應用方框圖,以及多種應用框圖和MLX90129 評估板框圖,電路圖和材料清單(BOM).

MLX90129: 13.56MHZ SENSOR TAG / DATALOGGER IC

The MLX90129 combines a precise acquisition chain for external resistive sensors, with a wide range of interface possibilities. It can be accessed and controlled through its ISO15693 RFID front-end or via its SPI port.Without any other component than a 13,56MHz tuned antenna, it becomes a RFID thermometer.

For measuring others physical quantities, one or two resistive sensors can be connected to make batteryless sensing point. In this tag mode, the chip can supply a regulated voltage to the other components of the application.

Adding a battery will enable the use of the standalone data logging mode. The sensor output data is stored in the internal 3.5kbits user memory. One can extend the storage capacity by connecting an external E2PROM to the SPI port.

The SPI port can also connect the MLX90129 to a microcontroller which allows more specific applications, like adding actuating capability or RF transmission.

The MLX90129 has been optimized for low power, low voltage battery and battery-less applications.

MLX90129主要特性和優勢:

Versatile A/D interface for resistive sensors

ISO-15693 13.56MHz transponder

Slave / Master SPI interface

4 k-bit EEPROM with access protection

Standalone data-logging mode

Ultra low power

Battery or battery-less applications

Low cost and compact design

MLX90129應用:

Cold chain monitoring

Asset management and monitoring (security and integrity)

Building automation

Industrial, medical and residential control and monitoring


圖1.MLX90129方框圖

圖2.MLX90129應用方框圖

圖3.MLX90129 RFID多傳感器標簽框圖

圖4.MLX90129數據采集框圖

圖5.MLX90129基于MCU的應用框圖

MLX90129 評估板

The EVB90129 is an assembled printed circuit board that simplifies evaluation of the MLX90129 sensor tag IC and to facilitate the development of wireless sensor applications based on the MLX90129.

The EVB90129 was developed to demonstrate a wide range of applications, from fully passive sensor tag operation to complex data logging. Each of its elements can be reconfigured by means of jumpers.

The board can be powered either by an external voltage supply, the on-board battery or the electromagnetic field from a RFID reader.In addition to the internal temperature sensor of the MLX90129, the EVB90129 embeds 3 external sensors, light, temperature and potentiometer to demonstrate the flexibility for measurement of a variety of physical quantities. The custom prototyping area allows users to integrate their own sensor or circuit into this evaluation board.

The EVB90129 is capable of storing 128 Kbytes of datas in the SPI EEPROM memory connected to the MLX90129. The EVB90129 can be accessed and controlled through a contactless (RFID) or a contact (SPI) interface. The RFID access to the MLX90129 and the related commands are compliant with the ISO15693 standard. The SPI and other digital inputs/outputs from the MLX90129 are connected to an 8-pin connector of the EVB90129. This allows easy connection to a microcontroller.

圖6.MLX90129 評估板外形圖

圖7.MLX90129 評估板框圖

圖8.MLX90129 評估板電路圖

MLX90129評估板材料清單(BOM):