MLX90109 Datasheet, PDF (9/15 Pages) List of Unclassifed Manufacturers – 125kHz RFID Integrated Transceiver

MLX90109
125kHz RFID Transceiver
Note for equation (5): Mind that the quality factor of the antenna (Q_ant) result in the quality factor of the coil
and the quality factor of the capacitance as:
(9)
Q_ant = Q_coil // Q_{capacitan ce}
So, a capacitance with a low quality factor may also reduce the antenna impedance.
9 Typical configuration: READ ONLY
9.1 Application diagram
The MLX90109 is a highly integrated reader IC. In the application schematic below, only two resistors to set
V_MODU are required, next to the antenna inductance and tune capacitor. Capacitors C1 and C_D can be added
for a better noise cancellation.
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9.2 Absolute minimum schematic
The interface with the microcontroller can be realized with only one connection. In this case, the mode pin is
left floating and the integrated decoding is not used.
3901090109
Rev 008
Page 9 of 15
Data Sheet
Jun/06