RF430CL331HIPWR datasheet(18/63 Pages) TI2

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RF430CL331H

SLASE18A – SEPTEMBER 2015 – REVISED NOVEMBER 2015

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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

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

5. Write Access

0xFF

0xE0

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

PICC supports only 106 kbps in both directions (default).

Same data rate from PCD to PICC and from PICC to PCD compulsory

PICC to PCD, data rate supported is 212 kbps

PICC to PCD, data rate supported is 424 kbps

PICC to PCD, data rate supported is 848 kbps

PCD to PICC, data rate supported is 212 kbps

PCD to PICC, data rate supported is 424 kbps

PCD to PICC, data rate supported is 848 kbps

Detailed Description

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