MLX90132 Datasheet, PDF (30/44 Pages) Melexis Microelectronic Systems – 13.56MHz RFID / NFC Transceiver

MLX90132
13.56MHz RFID / NFC Transceiver
Actual state returned by the MLX90132
Value
State
0x00
IDLE
0x01
READY_1
0x02
READY_2
0x03
READY_3
0x04
ACTIVE
0x80
HALT
0x81
READY*_1
0x82
READY*_2
0x83
READY*_3
0x84
ACTIVE*
Comment
IDLE state
READY state after 1^st part of UID is verified
READY state after 2^nd part of UID is verified
READY state after 3^rd part of UID is verified
ACTIVE state
HALT state
READY* state after 1^st part of UID is verified
READY* state after 2^ndpart of UID is verified
READY* state after 3^rdpart of UID is verified
ACTIVE* state
Table 30: Current state returned by the MLX90132 (as defined in ISO/IEC14443-A standard)
7 Modifying internal settings for optimal performances
7.1.1 Example: How to modify the ARC_B register
The internal registers of the MLX90132 are automatically set when the protocol is selected with the command
Protocol select command (0x02). To get optimal performance, the internal register ARC_B containing the
modulation index of the RFID request and the analog gain for the reception chain in reader mode can be
modified. The following example shows the specific commands to be sent to read/write the register ARC_B:
Use the “Protocol Select” command (0x02) to select the appropriate communication protocol.
 Send Protocol Select command (for example ISO/IEC14443A):
0x02020200
 MLX90132 reply:
0x0000
Read Analog Configuration register (ARC_B) value
 Write the ARC_B register index to 0x01:
0x0903680001
 MLX90132 reply:
0x0000
 Read the ARC_B register value:
 MLX90132 reply:
0x0803690100
0x01DF⁽¹⁾
Modify the value of Analog Register Configuration (ARC_B) to 0x23
 Write the ARC_B register:
0x090468010123
 MLX90132 reply:
0x0000
Read back the Analog Configuration register (ARC_B) value
 Write the ARC_B register index to 0x01:
0x0903680001
 MLX90132 reply:
0x0000
 Read the ARC_B register value:
0x0803690100
 MLX90132 reply:
0x0123
(1)_{In this example, the ARC_B register = 0xDF with ‘D’ = Modulation Index & ‘F’ = Rx amplifier gain.}
3901090132
Rev. 009
Page 30 of 44
Jan-2014