MLX90109EDC-AAA-000-RE(2012) 查看數據表（PDF） - Melexis Microelectronic Systems
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MLX90109EDC-AAA-000-RE Datasheet PDF : 16 Pages
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MLX90109
125kHz RFID Transceiver
Remarks:
Note for equation (4): Mind that in reality the strong coupling with the tag may drastically reduce the antenna
impedance.
Note for equation (5): Mind that the quality factor of the antenna (Qant) results in the quality factor of the coil
and the quality factor of the capacitance as:
(9)
Qant = Qcoil // Qcapaci tan 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
VMODU are required, next to the antenna inductance and tune capacitor. Capacitors C1 and CD can be added
for a better noise cancellation.
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 011
Page 10 of 16
Data Sheet
Jun/12
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