PN5120A0HN/C1,518 NXP Semiconductors, PN5120A0HN/C1,518 Datasheet - Page 95

• Manufacturer Part Number: PN5120A0HN/C1,518
• Description: IC TRANSMISSION MOD 40-HVQFN
• Manufacturer: NXP Semiconductors

Specifications of PN5120A0HN/C1,518

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO14443-A, ISO14443-B
• Package / Case: 40-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
17. Oscillator circuitry
18. Reset and oscillator start-up time
PN512
Product data sheet
COMPANY PUBLIC
18.1 Reset timing requirements
18.2 Oscillator start-up time
The clock applied to the PN512 provides a time basis for the synchronous system’s
encoder and decoder. The stability of the clock frequency, therefore, is an important factor
for correct operation. To obtain optimum performance, clock jitter must be reduced as
much as possible. This is best achieved using the internal oscillator buffer with the
recommended circuitry.
If an external clock source is used, the clock signal must be applied to pin OSCIN. In this
case, special care must be taken with the clock duty cycle and clock jitter and the clock
quality must be verified.
The reset signal is filtered by a hysteresis circuit and a spike filter before it enters the
digital circuit. The spike filter rejects signals shorter than 10 ns. In order to perform a reset,
the signal must be LOW for at least 100 ns.
If the PN512 has been set to a Power-down mode or is powered by a V
start-up time for the PN512 depends on the oscillator used and is shown in
The time (t
start-up time is defined by the crystal.
The time (t
the PN512 can be addressed.
The delay time is calculated by:
The time (t
t
Fig 34. Quartz crystal connection
d
=
------------- -
27 μs
1024
d
startup
osc
) is the internal delay time of the PN512 when the clock signal is stable before
=
) is the sum of t
37.74 μs
All information provided in this document is subject to legal disclaimers.
) is the start-up time of the crystal oscillator circuit. The crystal oscillator
Rev. 3.6 — 10 March 2011
d
and t
111336
startup
OSCOUT
.
27.12 MHz
PN512
OSCIN
001aan231
Transmission module
© NXP B.V. 2011. All rights reserved.
DDX
Figure
supply, the
PN512
95 of 125
35.
(5)