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MFRC522 Datasheet(PDF) 55 Page - NXP Semiconductors

Part No. MFRC522
Description  Contactless Reader IC
Download  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 55 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
55 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
10.4.6 7-BIT ADDRESSING
During the I2C-bus addressing procedure, the first byte after the START condition is used
to determine which slave will be selected by the master.
As an exception several address numbers are reserved. During device configuration, the
designer has to ensure, that no collision with these reserved addresses is possible. Check
the corresponding I2C specification for a complete list of reserved addresses.
The I2C address specification is dependent on the definition of the EA Pin. Immediately
after releasing the reset pin or after power on reset, the device defines the I2C address
according EA pin.
If EA Pin is set to LOW than for all MFRC522 devices the upper 4 bits of the device bus
address are reserved by NXP and set to 0101(bin). The remaining 3 bits (ADR_0, ADR_1,
ADR_2) of the Slave Address can freely configured by the customer in order to prevent
collisions with other I2C devices.
If EA Pin is set to HIGH than ADR_0 to ADR_5 can be completely specified at the external
pins according to Table Table 135 “Connection Scheme for detecting the different
Interface Types”. ADR_6 is always set to logic 0.
In both modes, the external address coding is latched immediately after releasing the
reset condition. Further changes at the used pins are not taken into consideration.
Depending on the external wiring, the I2C address pins could be used for test signal
output.
Fig 15. Data transfer on the I2C- bus.


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