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MFRC522 Datasheet(PDF) 69 Page - NXP Semiconductors

No. de pieza MFRC522
Descripción Electrónicos  Contactless Reader IC
PDF  109 Pages
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Fabricante Electrónico  NXP [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 69 Page - NXP Semiconductors

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© 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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