Datasheet

PN512 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 5.2 — 16 June 2016
111352 91 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
11.6.2 Waveform shape for ISO/IEC 14443A and MIFARE S
2
C support
The secure IC, e.g. the SmartMX is connected to the PN512 via the pins SIGOUT and
SIGIN.
The waveform shape at SIGOUT is a digital 13.56 MHz Miller coded signal with levels
between PVSS and PVDD derived out of the external 13.56 MHz carrier signal in case of
the Contactless Card mode or internally generated in terms of Secure Access mode.
The register TxSelReg controls the setting at SIGOUT.
Note: The clock settings for the Secure Access mode and the Contactless Card mode
differ, refer to the description of the bits SAMClockSel in register TestSel1Reg.
The signal at SIGIN is a digital Manchester coded signal according to the requirements of
the ISO/IEC 14443A with the subcarrier frequency of 847.5 kHz generated by the secure
IC.
Fig 33. Signal shape for SIGOUT in MIFARE Card SAM mode
Fig 34. Signal shape for SIGIN in MIFARE Card SAM mode
001aan229
1
0
bit
value RF
signal on
antenna
signal on
SIGOUT
01001
001aan230
0
1
0
0011
bit
value
signal on
antenna
signal on
SIGIN