MFRC52201HN1,151 NXP Semiconductors, MFRC52201HN1,151 Datasheet - Page 71

• Manufacturer Part Number: MFRC52201HN1,151
• Description: IC READER 13.56MHZ 32-HVQFN
• Manufacturer: NXP Semiconductors

Specifications of MFRC52201HN1,151

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935280547151

NXP Semiconductors
17. Reset and Oscillator Startup Time
112132
Product data sheet
17.1 Reset Timing Requirements
17.2 Oscillator Startup Time
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.
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 t
startup time is defined by the crystal itself.
The t
before the MFRC522 can be addressed. The delay time is calculated as follows:
t
The time t
delay
Device Activation
Fig 23. Oscillator Startup time.
Clock Stable
Clock Ready
delay
[μs] = 1024/27.12 = 37.76 μs.
Oscillator
defines the internal delay time of the MFRC522 when the clock signal is stable
startup
osc
is defined as the sum of the time t
defines the startup time of crystal oscillator circuit. The crystal oscillator
Rev. 3.2 — 22 May 2007
t startup
t osc
delay
and t
startup
.
Contactless Reader IC
MFRC522
© NXP B.V. 2007. All rights reserved.
t delay
71 of 109
t