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MFRC522 bảng dữ liệu(PDF) 71 Page - NXP Semiconductors

tên linh kiện MFRC522
Giải thích chi tiết về linh kiện  Contactless Reader IC
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MFRC522 bảng dữ liệu(HTML) 71 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
71 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
17. Reset and Oscillator Startup Time
17.1 Reset Timing Requirements
The reset signal is filtered by a hysteresis circuit and a spike filter (rejects signals shorter
than 10 ns) before it enters the digital circuit. In order to perform a reset, the signal has to
be low for at least 100 ns.
17.2 Oscillator Startup Time
Having set the MFRC522 to a Power-down mode or supplying the IC with XVDD the
following figure describes the startup timing for the oscillator.
The time tstartup defines the startup time of crystal oscillator circuit. The crystal oscillator
startup time is defined by the crystal itself.
The tdelay defines the internal delay time of the MFRC522 when the clock signal is stable
before the MFRC522 can be addressed. The delay time is calculated as follows:
tdelay [μs] = 1024/27.12 = 37.76 μs.
The time tosc is defined as the sum of the time tdelay and tstartup.
Fig 23. Oscillator Startup time.
Device Activation
Oscillator
Clock Stable
Clock Ready
t startup
t osc
t delay
t



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