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| MLX90109_06 Datasheet, PDF (11/15 Pages) Melexis Microelectronic Systems – 125kHz RFID Transceiver | |||
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MLX90109
125kHz RFID Transceiver
10 Typical configuration: READ/WRITE ON/OFF keying (FDX-B100)
10.1 Application diagram
The basic principle is to switch the voltage on MODU between 0V and VDD. The antenna will reach its
maximum amplitude in less than 3 periods when MODU is stepped down from VDD to VSS. Setting the chip in
power-down (set VMODU up to VDD) will let the antenna fade-out with a time constant, depending on the
antennaâs quality factor Qant. For fast protocols, an additional drain resistor on MODU controlled by the
microcontroller could be used to decrease the fall time (refer to the application note MLX90109 â100%
modulation (ON/OFF Keying)â.
Note : Care should be taken to the capacitor C1 which may reduce the fall time.
3901090109
Rev 008
Page 11 of 15
Data Sheet
Jun/06
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