MFRC522_09 Datasheet, PDF (83/96 Pages) NXP Semiconductors – Contactless reader IC

NXP Semiconductors
MFRC522
Contactless reader IC
16.1.3.4 Example: Output test signals RxActive and TxActive
Figure 31 shows the RxActive and TxActive test signals relating to RF communication.
The AnalogTestReg register is set to CDh.
• At 106 kBd, RxActive is HIGH during data bits, parity and CRC reception. Start bits
are not included
• At 106 kBd, TxActive is HIGH during start bits, data bits, parity and CRC transmission
• At 212 kBd, 424 kBd and 848 kBd, RxActive is HIGH during data bits and CRC
reception. Start bits are not included
• At 212 kBd, 424 kBd and 848 kBd, TxActive is HIGH during data bits and CRC
transmission
001aak600
(1)
(2)
(3)
(1) RxActive (2 V/div) on pin AUX1.
(2) TxActive (2 V/div) on pin AUX2.
(3) RF field.
Fig 31. Output RxActive on pin AUX1 and TxActive on pin AUX2
10 µs/div
MFRC522_33
Product data sheet
PUBLIC
Rev. 3 — 26 October 2009
112133
© NXP B.V. 2009. All rights reserved.
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