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MCRF200IWFQ23 Datenblatt(PDF) 4 Page - Microchip Technology

Teilenummer MCRF200IWFQ23
Bauteilbeschribung  125 kHz microID??Passive RFID Device
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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MCRF200
DS21219H-page 4
 2003 Microchip Technology Inc.
2.0
FUNCTION DESCRIPTION
The device contains three major building blocks. They
are RF front-end, configuration and control logic, and
memory sections. The Block Diagram is shown on
page 1.
2.1
RF Front-End
The RF front-end of the device includes circuits for
rectification of the carrier, VDD (operating voltage) and
high-voltage clamping. This section also includes a
clock generator and modulation circuit.
2.1.1
RECTIFIER – AC CLAMP
The rectifier circuit rectifies RF voltage on the external
LC antenna circuit. Any excessive voltage on the tuned
circuit is clamped by the internal circuitry to a safe level
to prevent damage to the IC.
2.1.2
POWER-ON RESET
This circuit generates a Power-on Reset when the tag
first enters the reader field. The Reset releases when
sufficient power has developed on the VDD regulator to
allow correct operation.
2.1.3
CLOCK GENERATOR
This circuit generates a clock based on the carrier
frequency from the reader. This clock is used to derive
all timing in the device, including the baud rate and
modulation rate.
2.1.4
MODULATION CIRCUIT
The device sends the encoded data to the reader by
AM-modulating the coil voltage across the tuned LC
circuit. A modulation transistor is placed between the
two antenna coil pads (VA and VB). The transistor turns
on and off based on the modulation signal. As a result,
the amplitude of the antenna coil voltage varies with the
modulation signal. See Figure 2-1 for details.
FIGURE 2-1:
MODULATION SIGNAL AND MODULATED SIGNAL
MCRF200
Modulation
Signal
VA
VB
Modulation
Modulation Signal
Modulated RF Signal
(across VA and VB)
LC
Amplitude
t
Transistor


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