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 107 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
19. Testsignals
19.1 Selftest
The PN512 has the capability to perform a digital selftest. To start the selftest the following
procedure has to be performed:
1. Perform a soft reset.
2. Clear the internal buffer by writing 25 bytes of 00h and perform the Config Command.
3. Enable the Selftest by writing the value 09h to the register AutoTestReg.
4. Write 00h to the FIFO.
5. Start the Selftest with the CalcCRC Command.
6. The Selftest will be performed.
7. When the Selftest is finished, the FIFO contains the following bytes:
Version 1.0 has a different Selftest answer, explained in Section 20
.
Correct answer for VersionReg equal to 82h:
00h, EBh, 66h, BAh, 57h, BFh, 23h, 95h, D0h, E3h, 0Dh, 3Dh, 27h, 89h, 5Ch, DEh,
9Dh, 3Bh, A7h, 00h, 21h, 5Bh, 89h, 82h, 51h, 3Ah, EBh, 02h, 0Ch, A5h, 00h,
49h, 7Ch, 84h, 4Dh, B3h, CCh, D2h, 1Bh, 81h, 5Dh, 48h, 76h, D5h, 71h, 61h,
21h, A9h, 86h, 96h, 83h, 38h, CFh, 9Dh, 5Bh, 6Dh, DCh, 15h, BAh, 3Eh, 7Dh,
95h, 3Bh, 2Fh
19.2 Testbus
The testbus is implemented for production test purposes. The following configuration can
be used to improve the design of a system using the PN512. The testbus allows to route
internal signals to the digital interface. The testbus signals are selected by accessing
TestBusSel in register TestSel2Reg.
Table 159. Testsignal routing (TestSel2Reg = 07h)
Pins D6 D5 D4 D3 D2 D1 D0
Testsignal sdata scoll svalid sover RCV_reset RFon,
filtered
Envelope
Table 160. Description of Testsignals
Pins Testsignal Description
D6 sdata shows the actual received data stream.
D5 scoll shows if in the actual bit a collision has been detected (106 kbit only)
D4 svalid shows if sdata and scoll are valid
D3 sover shows that the receiver has detected a stop condition
(ISO/IEC 14443A/ MIFARE mode only).
D2 RCV_reset shows if the receiver is reset
D1 RFon, filtered shows the value of the internal RF level detector
D0 Envelope shows the output of the internal coder