MLX90109CDC(2006) 查看數據表（PDF） - Melexis Microelectronic Systems

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MLX90109CDC
(Rev.:2006)

125kHz RFID Transceiver

Melexis Microelectronic Systems  

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

antenna’s 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 “100%

modulation (ON/OFF Keying)”.

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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