MFRC522 datasheet(76/109 Pages) NXP

76 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

76 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

19. Testsignals

19.1 Selftest

The MFRC522 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:

Correct answer for register VersionReg equal to 90h:

00h, 87h, 98h, 0fh, 49h, FFh, 07h, 19h

BFh, 22h, 30h, 49h, 59h, 63h, ADh, CAh

7Fh, E3h, 4Eh, 03h, 5Ch, 4Eh, 49h, 50h

47h, 9Ah, 37h, 61h, E7h, E 2h, C6h, 2Eh

75h, 5Ah, EDh, 04h, 3Dh, 02h, 4Bh, 78h

32h, FFh, 58h, 3Bh, 7Ch, E9h, 00h, 94h

B4h, 4Ah, 59h, 5Bh, FDh, U9h, 29h, DFh

35h, 96h, 98h, 9Eh, 4Fh, 30h, 32h, 8Dh

Correct answer for register VersionReg equal to 91h:

00h, C6h, 37h, D5h, 32h, B7h, 57h, 5Ch,

C2h, D8h, 7Ch, 4Dh, D9h, 70h, C7h, 73h,

10h, E6h, D2h, AAh, 5Eh, A1h, 3Eh, 5Ah,

14h, AFh, 30h, 61h, C9h, 70h, DBh, 2Eh,

64h, 22h, 72h, B5h, BDh, 65h, F4h, ECh,

22h, BCh, D3h, 72h, 35h, CDh, AAh, 41h,

1Fh, A7h, F3h, 53h, 14h, DEh, 7Eh, 02h,

D9h, 0Fh, B5h, 5Eh, 25h, 1Dh, 29h, 79h

19.2 Test bus

The test bus is implemented for production test purposes. The following configuration can

be used to improve the design of a system using the MFRC522. The test bus allows to

route internal signals to the digital interface. The test bus signals are selected by

accessing TestBusSel in register TestSel2Reg.

Table 150: TestSel2Reg register (address 07h)

Pins

Testsignal

sdata

scoll

svalid

sover

RCV_reset

MFRC522 Datasheet(PDF) 76 Page - NXP Semiconductors

MFRC522 Datasheet(HTML) 76 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL