MLX90132 Datasheet, PDF (29/44 Pages) Melexis Microelectronic Systems – 13.56MHz RFID / NFC Transceiver

MLX90132
13.56MHz RFID / NFC Transceiver
6.12 AcFilter command (0x0D)
This command is used with the MLX90132 in TAG emulation, ISO/IEC14443-A. If activated, it autonomously
handles the anti-collision algorithm. If not activated, all received commands will be sent to the application.
If the filter is activated, the MLX90132 will interpret the ISO/IEC14443-A commands sent by the reader and
performs the anti-collision procedure. In this case, data will be sent to the external microcontroller only when
the anti-collision procedure is finished.
Activate/deactivate anti-collision filter 0x0D
Direction
Data
Comments
0D
Command code
<Len>
Length of data
<ATQA>
(2bytes, LSByte 1st)
Coding of ATQA, answer to
REQA command (refer to
ISO/IEC14443A standard)
Coding of SAK, select
<SAK>
acknowledgement (refer to
MCU – device _{<UID part 1>}
ISO/IEC14443A standard)
UID for cascade level 1
(4bytes, LSByte 1st) (Mandatory)
<UID part 2>
UID for cascade level 2
(4bytes, LSByte 1st) (Optional)
<UID part 3>
UID for cascade level 3
(4bytes, LSByte 1st) (Optional)
00
Device - MCU
00
Result code
Length of data = 0
Example
0D0B4400AA8804485BA1120000 -
Activate filter for 2-cascade anti-collision
Note that length can be
7 – for 1-cascade level filter
11 – for 2-cascade levels filter
15 – for 3-cascade levels filter
All other values will cause ‘Invalid command
length’ error.
0D00 – Return AC state and deactivate AC
filter
0D01XX – Force AC state to XX value
0D020000 – Returns AC state without
deactivating filter
0000 - Filter is successfully
activated/deactivated
82
Device - MCU
00
83
Device - MCU
00
Error code
Length of data
Error code
Length of data
8200 - Invalid command length
8300 - Invalid protocol
Table 28: “AcFilter” command description
The MLX90132 is able to interpret and respond to the following commands:
Anti-collision commands supported by the MLX90132
Command
REQA
WUPA
ANTICOLL
SELECT
Code
26 (7-bit)
52 (7-bit)
93, 95, 97
9370, 9570, 9770
Definition
Sense request
WU all request
Single device detection request
Select request
Table 29: ISO/IEC14443-A anti-collision commands supported by the MLX90132
Notes:
 The current anti-collision state can be forced using the command 0x0D01XX, with XX selected according
to Table 30 below.
 Command 0x0D020000 can be used to return the current anti-collision state without deactivating the anti-
collision filter. Please refer to Table 30 below for the anti-collision state.
 The command 0x0D00 will be used to return the current anti-collision state and deactivate the anti-
collision filter.
 UID part 2 and 3 are optional and may not be included in the command. The UID size, as defined in the
ISO/IEC14443A standard (part of the ATQA), will be updated automatically by the MLX90132 according
to the UID length.
3901090132
Rev. 009
Page 29 of 44
Jan-2014