AS3909 datasheet(13/77 Pages) AMSCO

13 / 77 page

ams Datasheet, Confidential: 2013-Oct [3-02]

AS3909/AS3910 – 13

Detaile d Desc rip t ion

ISO-14443 and NFCIP Framing

This block performs ISO-14443 and NFCIP-1 106 kbps active

communication framing for receive and transmit according to

the selected ISO mode and data rate settings.

• In reception, it takes demodulated subcarrier signal from

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

FIFO; generates parity and CRC bits; adds SOF and EOF;

and performs final encoding before passing modulation

signal to transmitter.

• In Transparent mode, the framing and FIFO are bypassed;

the digitized subcarrier signal, which is Receiver output is

directly sent to SDATAO pin; signal applied to SDATAI pin

is directly used to modulate the transmitter.

FIFO

The AS3909/10 contains a 32byte FIFO. Depending on the

mode, it contains either data that has been received or data that

is to be transmitted.

Control Logic

The control logic contains I/O registers, which define the

operation of device.

SPI Interface

A 4-wire Serial Peripheral interface (SPI) is used for

communication between external microcontroller and the

AS3909/10.

AS3909 数据表(PDF) 13 Page - ams AG