RF430CL331H datasheet(34/60 Pages) TI1

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RF430CL331H

SLASE18A – SEPTEMBER 2015 – REVISED NOVEMBER 2015

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1. The PCD issues a Type 4 command (Select, Read Binary, or Update Binary).

2. If this command needs host controller response, the RF430CL331H sets up the registers and asserts

INTO.

3. The RF430CL331H starts the internal initial timer of 55 ms.

4. If the host controller does not respond in 55 ms, (that is, the Host Response register Interrupt Serviced

Bit 0 is not set) the RF430CL331H sets the I2C_READY and I2C_SIGNAL pins to low, which.

I2C_SIGNAL is a signal that is asserted when there is an active S(WTX) request ongoing. During this

time the I2C communication does not have to be stopped.

5. After the PICC issues the wait time extension there is another period of time in which the host

controller has time to respond to the initial interrupt request.

6. At this time, the PCD sends out a packet. This point should be avoided, because this will likely mean

the PCD will break off communications..

7. After several milliseconds, the RF430CL331H issues an S(WTX) request to the PCD.

(a) The WTXM field in the Frame Wait Time Extension (see Section 5.11.12) is set with the value in

the SWTX register.

8. Sends the Wait Time Extension request.

9. Sets the I2C_SIGNAL and I2C_READY pins to high indicating that communication can continue.

10. If the host controller does not service the interrupt in a certain period of time (the internal timer

expires, but this does not produce an effect), the PCD issues a R(NACK) command. This and any

other command are not handled by the RF430CL331H; there is no response, because the

RF430CL331H command buffer still has the previous command that it has not serviced. Thus, the

command must be serviced after the first S(WTX) request.

11. If the PCD issues a command after the first S(WTX) command, it is likely to not be serviced, and this

typically results in a Deselect command with a field reset. The communication must be restarted.

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RF430CL331H Datasheet(PDF) 34 Page - Texas Instruments