mlx90121 Melexis Company, mlx90121 Datasheet - Page 10

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

After sending address and data, the MODE line is asserted high and the chip is ready to receive the next
register configuration.
Notes
11.3. Communication Modes
11.3.1. Transmission
11.3.1.a. Analog Setup
For the transmission, the modulation depth has to be chosen. This is done by the TModIndex bit of the
AnalogConfig register, which selects the modulation index: 10% or 100%.
The modulation index can be further tuned by means of the external RMOD resistor.
3901090121
Rev. 007
1. If a register does not contain eight bits, write ‘0’ in the unused bit.
2. When MODE is asserted high, the chip is in communication mode. If the encoder is disabled (by
3. In case of successive registers writings, it is mandatory to have MODE asserted high for at least
default), DIN has to be kept at ‘1’ to avoid any modulation on the antenna.
T
mw
= 5 s in between each access, as shown in the following diagram.
MODE
MODE
RTB
DIN
CK
CK
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MSB
Address
Writing 1
LSB
MSB
Tmw
13.56MHz RFID Transceiver
Data
Writing 2
LSB
MLX90121
Data Sheet
Jan-2008