MFRC522 datasheet(69/109 Pages) NXP

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MFRC522 Datasheet(PDF) 69 Page - NXP Semiconductors

69 / 109 page

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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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