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MFRC522 Datasheet(PDF) 55 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 55 Page - NXP Semiconductors |
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55 / 109 page  112132 © 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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