ST25R3911B datasheet(13/129 Pages) STMICROELECTRONICS

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ST25R3911B

Functional overview

1.1.11

ISO-14443 and NFCIP-1 framing

This block performs framing for receive and transmit according to the selected ISO mode

and bit rate settings.

In reception it takes the demodulated sub-carrier signal from the receiver. It recognizes the

SOF, EOF and data bits, performs parity and CRC check, organizes the received data in

bytes and places them in the FIFO.

During transmit, it operates inversely, it takes bytes from the FIFO, generates parity and

CRC bits, adds SOF and EOF and performs final encoding before passing the modulation

signal to the transmitter.

In Transparent mode, the framing and FIFO are bypassed, the digitized sub-carrier signal

(the receiver output), is directly sent to the MISO pin, and the signal applied to the MOSI pin

is directly used to modulate the transmitter.

1.1.12

FIFO

The ST25R3911B contains a 96-byte FIFO. Depending on the mode, it contains either data

that has been received or data to be transmitted.

1.1.13

Control logic

The control logic contains I/O registers that define operation of device.

1.1.14

SPI

A 4-wire Serial Peripheral Interface (SPI) is used for communication between the external

microcontroller and the ST25R3911B.

1.2

Application information

The minimum configurations required to operate the ST25R3911B are shown in Figure 2

and Figure 3.

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