MLX90109 Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90109

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)”.

VDD

FAST_MOD

VDD

Microcontroller

CD=100nF

L, C

1

8

C1

2

7 DATA

CLOCK

3

6

4

5 MODE

SPEED

MODU

Note : Care should be taken to the capacitor C1 which may reduce the fall time.

REVISION 011 - JUNE 19, 2017

3901090109

Page 13 of 17

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