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RF430CL331HIPWR Datasheet(PDF) 18 Page - Texas Instruments |
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RF430CL331HIPWR Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 60 page  RF430CL331H SLASE18A – SEPTEMBER 2015 – REVISED NOVEMBER 2015 www.ti.com 5.7.3 Data Rate Settings The device supports data rates of 106, 212, 424, and 848 kbps. The device always answers ATTRIB commands from the PCD that request higher data rates. The NFC Forum specifies for NFC-B a maximum data rate of 106 kbps. It is assumed that an NFC-compliant PCD would not request higher data rates, thus, no interoperability issues are expected. Even though all data rates up to 848 kbps are supported, the device by default reports only the capability to support 106 kbps to the PCD. To change this behavior, follow these steps using the I2C serial interface: 1. If you do not want to support all data rates up to 848 kbps, change the Data Rate Capability byte according to Table 5-7. Table 5-6 summarizes how to write the data rate, and the Data Rate Capability byte is set by the DATA 0 value in Step 3. Write Access. 2. Do the steps of the selected sequence. It is important to execute this sequence (in Table 5-6) before setting the Control register. NOTE The General Control register (see Section 5.11.1) is set to 0 after the sequence is completed in Table 5-6. Table 5-6. Data Rate Setting Sequence ADDRESS BITS ADDRESS BITS ACCESS TYPE DATA 0 DATA 1 15 TO 8 7 TO 0 1. Write Access 0xFF 0xE0 0x4E 0x00 2. Write Access 0xFF 0xFE 0x80 0x00 3. Write Access 0x2A 0xBA 0xF7 (1) 0x00 4. Write Access 0x27 0xB8 0x00 0x00 5. Write Access 0xFF 0xE0 0x00 0x00 (1) Data Rate Capability according to Table 5-7. 0xF7: all data rates up to 848 kbps are supported. Table 5-7. Data Rate Capability DATA RATA CAPABILITY BYTE DESCRIPTION B7 B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 0 0 PICC supports only 106 kbps in both directions (default). 1 x x x 0 x x x Same data rate from PCD to PICC and from PICC to PCD compulsory x x x 1 0 x x x PICC to PCD, data rate supported is 212 kbps x x 1 x 0 x x x PICC to PCD, data rate supported is 424 kbps x 1 x x 0 x x x PICC to PCD, data rate supported is 848 kbps x x x x 0 x x 1 PCD to PICC, data rate supported is 212 kbps x x x x 0 x 1 x PCD to PICC, data rate supported is 424 kbps x x x x 0 1 x x PCD to PICC, data rate supported is 848 kbps 18 Detailed Description Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: RF430CL331H |
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