MLX90129 Просмотр технического описания (PDF) - Melexis Microelectronic Systems
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MLX90129 Datasheet PDF : 60 Pages
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MLX90129
13.56MHZ SENSOR TAG / DATALOGGER IC
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
0x00
0x01
0x02
From SPI side
From RFID side
SPI / RFID
SPI core control word
RFID core control word
SPI core interrupt/status word (read RFID core interrupt/status word (read
only)
only)
SPI local buffer (read only)
RFID local buffer (read only)
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Addr
0x03
0x04
0x05
0x06
0x07
0x08
0x09
Access by SPI and RFID
Non-volatile memory
EE-Latches word 0
EE-Latches word 1
Direct Memory Access (DMA)
Current destination address (read only)
Sensors
ADC buffer sensor 0
ADC buffer sensor 1
ADC buffer sensor 2
Contactless-tuning capacitance (CTC)
CTC code
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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.
REVISION 011 - JUNE 13, 2017
3901090129
Page 15 of 60
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