Data Sheet

MFRC522 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. 3.9 — 27 April 2016
112139 7 of 95
NXP Semiconductors
MFRC522
Standard performance MIFARE and NTAG frontend
[1] Pin types: I = Input, O = Output, I/O = Input/Output, P = Power and G = Ground.
[2] The pin functionality of these pins is explained in Section 8.1 “
Digital interfaces”.
[3] Connection of heatsink pad on package bottom side is not necessary. Optional connection to pin DVSS is possible.
16 VMID P internal reference voltage
17 RX I RF signal input
18 AVSS G analog ground
19 AUX1 O auxiliary outputs for test purposes
20 AUX2 O auxiliary outputs for test purposes
21 OSCIN I crystal oscillator inverting amplifier input; also the input for an externally generated clock
(f
clk
= 27.12 MHz)
22 OSCOUT O crystal oscillator inverting amplifier output
23 IRQ O interrupt request output: indicates an interrupt event
24 SDA I/O I
2
C-bus serial data line input/output
[2]
NSS I SPI signal input
[2]
RX I UART address input
[2]
25 D1 I/O test port
[2]
ADR_5 I/O I
2
C-bus address 5 input
[2]
26 D2 I/O test port
ADR_4 I I
2
C-bus address 4 input
[2]
27 D3 I/O test port
ADR_3 I I
2
C-bus address 3 input
[2]
28 D4 I/O test port
ADR_2 I I
2
C-bus address 2 input
[2]
29 D5 I/O test port
ADR_1 I I
2
C-bus address 1 input
[2]
SCK I SPI serial clock input
[2]
DTRQ O UART request to send output to microcontroller
[2]
30 D6 I/O test port
ADR_0 I I
2
C-bus address 0 input
[2]
MOSI I/O SPI master out, slave in
[2]
MX O UART output to microcontroller
[2]
31 D7 I/O test port
SCL I/O I
2
C-bus clock input/output
[2]
MISO I/O SPI master in, slave out
[2]
TX O UART data output to microcontroller
[2]
32 EA I external address input for coding I
2
C-bus address
[2]
Table 3. Pin description …continued
Pin Symbol Type
[1]
Description