MFRC522 datasheet(6/96 Pages) NXP

6 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

6 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

[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.

VMID

internal reference voltage

RF signal input

AVSS

analog ground

AUX1

auxiliary outputs for test purposes

AUX2

auxiliary outputs for test purposes

OSCIN

crystal oscillator inverting ampliﬁer input; also the input for an externally generated clock

(fclk = 27.12 MHz)

OSCOUT

crystal oscillator inverting ampliﬁer output

IRQ

interrupt request output: indicates an interrupt event

SDA

I/O

I2C-bus serial data line input/output[2]

NSS

SPI signal input[2]

UART address input[2]

I/O

test port[2]

ADR_5

I/O

I2C-bus address 5 input[2]

I/O

test port

ADR_4

I2C-bus address 4 input[2]

I/O

test port

ADR_3

I2C-bus address 3 input[2]

I/O

test port

ADR_2

I2C-bus address 2 input[2]

I/O

test port

ADR_1

I2C-bus address 1 input[2]

SCK

SPI serial clock input[2]

DTRQ

UART request to send output to microcontroller[2]

I/O

test port

ADR_0

I2C-bus address 0 input[2]

MOSI

I/O

SPI master out, slave in[2]

UART output to microcontroller[2]

I/O

test port

SCL

I/O

I2C-bus clock input/output[2]

MISO

I/O

SPI master in, slave out[2]

UART data output to microcontroller[2]

external address input for coding I2C-bus address[2]

Table 3.

Pin description …continued

Symbol

Type[1] Description

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