MLX90129RUC-CAA-000-WB(2012) Просмотр технического описания (PDF) - Melexis Microelectronic Systems
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MLX90129RUC-CAA-000-WB 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 only) RFID core interrupt/status word (read 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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Page 40
Page 15
Page 15
Page 15
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.
3901090129
Rev 009
Page 13 of 60
Data Sheet
Jun/12
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