MLX90129 datasheet(13/60 Pages) MELEXIS

13 / 60 page

MLX90129

13.56MHZ SENSOR TAG / DATALOGGER IC

Page 13 of 60

REVISION 011 - JUNE 13, 2017

3901090129

7.2. Digital Controller and memory domains

7.2.1. Digital controller

The main features of the digital part of MLX90129, called

Digital Controller are:



Slave / Master SPI interface



RFID interface



DMA: Direct Memory Access



EEPROM controller



Sensor interface controller



Clock and Power management



Core: transactions arbiter and interrupt

manager

The digital controller manages the transactions between

the communication interfaces, the memories and the

sensor. It allows also a standalone mode with its DMA

unit. All these blocks are described in the next chapters.

The SPI and RFID communication ways can be used concurrently. The Core transaction arbiter handles the priorities and the

interrupts. It updates some status bits that may be used by the external microcontroller or the RFID base-station to optimize the

communication.

The Digital Controller of the MLX90129 allows the user to do the following tasks, via SPI or RFID:

_ Configure the sensor interface and the communication media.

_ Manage the power consumption, the interrupts, the security items,…

_ Run A/D conversions of the selected sensors.

_ Store (or read) data in the internal or in an external EEPROM.

_ Configure and start a standalone process (sleep – sense – interrupt or store – sleep - …)

_ Get the status of the current process.

All these tasks may be done by simply reading or writing the different memories: EEPROM, registers, ee-Latches, internal devices.

Thus, several address domains are defined to access them in an easy way.

7.2.2. Address domains

Four address domains have been defined to designate the memory and the non-memory devices that act during the requested

transactions:

- EEPROM address domain:

This domain addresses the non-volatile EEPROM. It is used to store the user-defined data and the image of the Register File that

can be automatically downloaded after a power-on. This memory block is energy independent and can store data even when the

MLX90129 is unpowered.

- Register File address domain:

This memory domain is used to store the current configuration information of all internal MLX90129 devices (Sensor interface,

Power management …). This memory is energy-dependent and must be updated each time the MLX90129 is turned-on.

- Internal Devices address domain:

This domain allows accessing the registers linked to the so-called internal devices like the ADC buffers, the status words of the

Core Transaction Arbiter and the EE-Latches. They may be accessed with the appropriate SPI / RFID commands including its

address. The difference with the Register File is the fact that they are not copied from the EEPROM at the start-up and they may

be used during the requested transaction.

SCLK

MISO

MOSI

SPI

RFID

interface

ISO15693

DMA

Direct

Memory

Access

CORE

Eeprom &

EeLatches

interface

Clock and Power

manager

Sensor & ADC

Controller

IRQ

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