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
9.4. Security
9.4.1. Communication security
The Device Security Register is stored in the EEPROM. It contains the access rights to the different memories by the RFID
interface. It allows a partial or complete disabling of the RFID interface. In addition, it controls the functionality of the SPI by
making it master or slave.
Device security map configuration register (EEPROM & Register, address #05, Read/Write)
Bits Name
#05 - Device security map
15:14 -
Description (when bit = 1)
Reserved (must be 00)
13
Rfid_Page0Read Allow read access to Register file page 0 for RFID.
12
Rfid_Page0Write Allow write access to Register file page 0 for RFID.*
11
Rfid_EEpViaDma Allows RFID access to internal EEPROM via DMA.
10
Rfid_Adc_Access Allow access to ADC buffer for RFID
9
Rfid_ Int_Read
Allow a read access to the external memory by RFID
8
Rfid_ Int_Write
Allow a read & write access to the external memory by RFID *
7
Rfid_EEl_Read
Allow a read access to EE-Latches by RFID
6
Rfid_EEl_Write
Allow a read & write access to EE-Latches by RFID *
5
Rfid_Reg_Read
Allow a read access to the Register file page 1by RFID
4
Rfid_Reg_Write Allow a read & write access to the Register file page 1 by RFID *
3
Rfid_Lock_Dis
Disable the RFID Core-lock access function
2
Rfid_LockUn_En Disable RFID lock device / unlock device functionality**
1
Rfid_Dis
Disable the RFID communication media
0
Spi_Master
SPI slave disable. Disable SPI-slave and enable activity of SPI-master.
*note: if the write-access is allowed, the read-access is also allowed, independently of the value of the read access bit
** when disabled the MLX90129 does not answer to the command “LOCK DEVICE”
9.4.2. EEPROM Access security
The access to the EEPROM words is protected depending on their content. Three security levels have been defined and can be
chosen for any EEPROM page. If any external device tries to access via SPI a memory location without permission, it obtains value
0xFFFF as result. Via RFID, the error response is defined by the standard ISO15693.
Definition of the different security levels
Security
level
L0
L1
L2
L3
Code Write access
00
SPI, DMA
01
SPI, DMA
10
SPI, RFID, DMA
11
Reserved
Read access
SPI, DMA
SPI, RFID, DMA
SPI, RFID, DMA
Reserved
Typical application
UID and security configuration
Register file initial configuration, data logging
Customer ID, Unlocked User Data
REVISION 011 - JUNE 13, 2017
3901090129
Page 54 of 60
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