mlx90121 Melexis Company, mlx90121 Datasheet - Page 15

• Manufacturer Part Number: mlx90121
• Description: 13.56mhz Rfid Transceiver
• Manufacturer: Melexis Company

11.3.2.b. Direct Reception
After analog processing, data reception can be either direct or pre-processed by hardware accelerators,
according to the configuration of the SelDOUT parameter in the DigitalConfig register.
Note
Direct reception is achieved with the following setup.
11.3.2.c. Reception with Majority Voting (MV)
Majority voting allows to:
At the beginning of the time slot (MVTime), an up / down counter is reset. When the input signal is
asserted high, it is counting up and when the input signal is asserted low, it is counting down. At the end
of time slot, the counter value is checked and the output value is set accordingly (low if counter is
negative; high if counter is positive).
Majority Voting Setup
The following parameters in the DigitalConfig register have to be set when using majority voting.
3901090121
Rev. 007
The output phase of PSK decoder is either normal or inverted.
Filter noisy signal,
Compensate for jitter,
Correct distorted signals.
MVEn: it enables the majority voting function.
DecTimeRef: it defines the duration of the time slot (MVTime)
MV output
Majority
Voting
signal
Input
0 1 0 1 2 1 2 3
MVTime
D1
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0 1 0 -1 -2 -3 -2 -3
D2
D1
13.56MHz RFID Transceiver
MLX90121
D2
Data Sheet
Jan-2008