MLX90129 View Datasheet(PDF) - Melexis Microelectronic Systems
Part Name
Description
Manufacturer
MLX90129 Datasheet PDF : 60 Pages
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MLX90129
13.56MHZ SENSOR TAG / DATALOGGER IC
RFID interrupt & status word (Devices address domain, address #01, read-only)
Bits Name
#01 – RFID interrupt & status word
15:13 (reserved)
12 Irq_ExternalEvent
11:8 (reserved)
7
Irq_Sensor_Threshold
6
Irq_Timer_WakeUp
5
Irq_DMA_ready
4
Irq_EEPROM_Full
3
(unused)
2
Transaction_Error_Flag
1
Last_Transaction_Status
0
Core_Main_Status
Description (if bit=1)
The pin AT has been disconnected from the GND.
The output data from the sensor has crossed the defined threshold level
or window
The count-down of the wake-up is over
The DMA transaction has been completed (in the non-loop mode)
The allocated memory for a datalogging with loop enable is full. The
datalogger starts to overwrite the first data.
One of the previously executed commands has failed (delay not fulfilled,
denied access, data not processed …). This bit is automatically cleared
after power-on or after read of the RFID interrupt & status word.
This bit indicates whether the last request has been processed (‘0’) or not
(‘1’). In this latter case, the MLX90129 ignores any new request.
The system is busy with an internal operation and the request from RFID
cannot be processed.
The following table summarizes the information about the interrupts which can be used with a RFID communication. The RFID
interrupt & status word in the Internal Device domain at the address 0x01 gives the status of the interruptions. It is read only. It
can be accessed with the command Read Internal Device.
For each bit of the RFID interrupt & status word, the condition to assert high or low the status flag is described.
Interrupt description
Irq_ExternalEvent
IRQ enable conditions
Status flag is set to ‘1’ when
Reset condition
Set to ‘1’ the bits 9 and 11 of the register #12
Pin AT is not connected to GND
Pin AT is connected to GND
Irq_Sensor_Threshold
IRQ enable conditions
Status flag is set to ‘1’ when
Reset condition
Set to ‘1’ the bits 8,9,10 of the registers #15, #1B, #21
The last ADC output code crosses the defined threshold level or window
The chip is requested to read a new value of the sensor
Irq_Timer_WakeUp
IRQ enable conditions
Status flag is set to ‘1’ when
Reset condition
Set to ‘1’ the bit 0 of the register #10
The timer has completed its counting phase
The timer is requested to start a new counting phase (during the automatic
logging mode)
Irq_DMA_ready
IRQ enable conditions
Status flag is set to ‘1’ when
Reset condition
Set to ‘1’ the bit 2 of the register #09
The DMA unit has completed the last requested transaction
Read the RFID interrupt & status word
REVISION 011 - JUNE 13, 2017
3901090129
Page 30 of 60
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