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MCRF200IS00A bảng dữ liệu(PDF) 4 Page - Microchip Technology |
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MCRF200IS00A bảng dữ liệu(HTML) 4 Page - Microchip Technology |
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4 / 24 page  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 |
Số phần tương tự - MCRF200IS00A |
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Mô tả tương tự - MCRF200IS00A |
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