DEMO90121DA Melexis Inc, DEMO90121DA Datasheet - Page 11

• Manufacturer Part Number: DEMO90121DA
• Description: KIT DEMO RFID DOOR ACCESS
• Manufacturer: Melexis Inc
• Type: RFID (Radio Frequency Identification)r

Specifications of DEMO90121DA

• Contents: Reader Board, Antenna Board, 3 tag cards, Battery, Battery cable, Software and Documentation
• For Use With/related Products: MLX90121
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MLX90121
13.56MHz RFID Transceiver
11.3.1.b. Direct Transmission
Before analog processing, data transmission can be either direct or pre-processed by means of hardware
accelerators. Direct transmission can be performed with the following setup:
Data has to be transmitted in real time by the microcontroller on DIN input. The modulation is done when
DIN is asserted low, so by default DIN has to be asserted high. If a configuration register has to be
written, keep DIN high when MODE is asserted low. In configuration mode, the field is held without
modulation independently of DIN.
11.3.1.c. Hardware Encoding Transmission
This programmable encoder allows predefining six different patterns of 8 bits. The encoder is selected by
setting the bit EncoderEn in the DigitalConfig register.
Symbol Setup
The six symbols are called EncoderSym0 to EncoderSym5. There is a seventh symbol which is hard-
coded to 0xFF (11111111).
A symbol is built with 8 bits as shown in the following figure.
Symbol
Code
1
0
1
1
1
0
1
1
ISO Examples
The ISO15693 protocol, mode 1 out of 4, is implemented using six symbols as shown in the following
table. Start of frame (SOF), end of frame (EOF) and pulses are all encoded using one symbol.
3901090121
Page 11 of 26
Data Sheet
Rev. 009
Sept.-2009