mlx90121 Melexis Company, mlx90121 Datasheet - Page 12

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

The ISO15693 protocol, mode 1 out of 256, is implemented using three symbols. Start of frame (SOF),
end of frame (EOF) and pulses encoding result of the combination of these three symbols.
Note
The ISO14443 -A protocol is implemented using three symbols, according to the ISO specification.
The ISO14443 -B protocol is implemented with only two symbols. This allows fast addressing with only
one CK pulse.
Time Reference Setup
The time reference is defined in the EncoderTimeRef register. The time reference contains the value of
one bit time. Hence
The bit time is defined by the EncTimeRef parameter. EncTimeRef is an integer value, it is calculated as
follows:
EncTimeRef is coded on 5 bits. This means that Bit_Time_max = 9.44 s and Symbol_Time_max =
75.52 s.
3901090121
Rev. 007
The position of the symbol Sym1 encodes pulses from 1 to 256. For example: Pulse1 = Sym1 +
255*Sym0 and Pulse45 = 44*Sym0 + Sym1 + 211*Sym0.
Symbol
_
Time
EncTime
8
*
Bit
Re
_
Page 12 of 26
Time
f


 

Bit
1
. 3
39
_
Time
Mhz
13.56MHz RFID Transceiver


 

1
MLX90121
Data Sheet
Jan-2008