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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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MFRC522 bảng dữ liệu(PDF) 69 Page - NXP Semiconductors |
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MFRC522 bảng dữ liệu(HTML) 69 Page - NXP Semiconductors |
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69 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 69 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 15. Oscillator Circuitry The clock applied to the MFRC522 acts as time basis for the coder and decoder of the synchronous system. Therefore stability of the clock frequency is an important factor for proper performance. To obtain highest performance, clock jitter has to be as small as possible. This is best achieved by using the internal oscillator buffer with the recommended circuitry. If an external clock source is used, the clock signal has to be applied to pin OSCIN. In this case special care for clock duty cycle and clock jitter is needed and the clock quality has to be verified. Fig 22. Ouartz Connection 27.12 MHz OSC OUT OSCIN RC522 |
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