MLX90129 datasheet(13/60 Pages) MELEXIS

13 / 60 page

MLX90129

13.56MHZ SENSOR TAG / DATALOGGER IC

3901090129

Page 13 of 60

Data Sheet

Rev 009

Jun/12

7.3 Internal Devices

The term Internal Devices designates the registers used to configure the main “non-memory” digital units:

sensor interface, SPI / RFID interfaces, DMA … All these registers are part of the Internal Device Address

Domain

The registers linked to the SPI and RFID interfaces, called SPI/RFID core control word and SPI/RFID core

interrupt/status word

have the same definition, but are physically different and may contain some different

data. The content of these registers are explained in the following chapters (SPI, RFID). Some of these bits

may be used to avoid conflicts for the memories access, when communicating with SPI and RFID at the

same time. For that, they can be accessed at any time via SPI or RFID.

The SPI / RFID local buffers store the result data of the last transaction. They are useful for example when

the A/D conversion time is too long and does not fit the timing requirements of the RFID protocol.

The EE-Latches contain some non-volatile data, immediately available (no delay, no supply), used for the

options of the clock and power management.

The registers of the DMA unit called Current destination address are used to give a status of the process (the

number of words that have been registered).

The ADC buffer sensor 0, sensor 1 and sensor 2 allow to start a sensor conversion according to the sensor

configuration saved in EEPROM in the sensor 0, 1 and 2 configuration are. The conversion starts with the

reading of the buffer. The output of the conversion is available in the SPI / RFID local buffer.

Map of the Internal Device Address Domain

Addr

From SPI side

From RFID side

Link

SPI / RFID

0x00

SPI core control word

RFID core control word

Page 33 / 29

0x01

SPI core interrupt/status word (read only)

RFID core interrupt/status word (read only)

Page 33 / 29

0x02

SPI local buffer (read only)

RFID local buffer (read only)

Page 33 / 29

Addr

Access by SPI and RFID

Link

Non-volatile memory

0x03

EE-Latches word 0

Page 14 / 53

0x04

EE-Latches word 1

Page 14 / 52

Direct Memory Access (DMA)

0x05

Current destination address (read only)

Page 40

Sensors

0x06

ADC buffer sensor 0

Page 15

0x07

ADC buffer sensor 1

Page 15

0x08

ADC buffer sensor 2

Page 15

Contactless-tuning capacitance (CTC)

0x09

CTC code

Page 14

Note:

The internal devices having the addresses 0x00, 0x01, 0x02, 0x05 are registers. Those having the addresses 0x03, 0x04,

0x09 are EE-Latches, and those whose addresses are 0x06, 0x07, and 0x08 refer to the ADC output buffers. The read /

write delays are specified for all kind of internal devices, when accessing them via SPI.

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