RC522 datasheet(46/109 Pages) NXP

46 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

46 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

10. DIGITAL Interfaces

10.1 Automatic

μ-Controller Interface Type Detection

The MFRC522 supports direct interfacing of various hosts as the SPI, I2C and serial

UART interface type. The MFRC522 resets its interface and checks the current host

interface type automatically having performed a Power-On or Hard Reset. The MFRC522

identifies the host interface by the means of the logic levels on the control pins after the

Reset Phase. This is done by a combination of fixed pin connections.The following table

shows the different configurations:

10.2 SPI Compatible interface

A serial peripheral interface (SPI compatible) is supported to enable high speed

communication to the host. The SPI Interface can handle data speed of up to 10 Mbit/s. In

the communication with a host MFRC522 acts as a slave receiving data from the external

host for register settings and to send and receive data relevant for the communication on

the RF interface.

Table 135: Connection Scheme for detecting the different Interface Types

MFRC522

Serial Interface Types

UART

SPI

I2C

SDA

NSS

SDA

I²C

MISO

SCL

MOSI

ADR_0

DTRQ

SCK

ADR_1

-ADR_2

-ADR_3

-ADR_4

-ADR_5

Remark: Overview on the pin behavior

Pin behavior

Input

Output

In/Out

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