AS3953B datasheet(2/65 Pages) AMSOSRAM

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[v1-04] 2016-Jan-07

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AS3953B

14443 High Speed Passive Tag

Interface

The AS3953B NFC interface IC (NFiC) delivers low cost, ultra low

power NFC forum functionality to multiple different

applications. The AS3953B is a analog front-end with integrated

14443A data framing and SPI interface. It is designed to create

a fast data link between an ISO 14443A reader device (PCD) and

a microcontroller. The AS3953B is passively powered meaning

that it can be supplied from the PCD magnetic field, eliminating

the need of a continual external supply. This makes the AS3953B

perfect for wireless communication to a low-power battery

powered device.

The AS3953B is used with an appropriate antenna coil

connected to the terminals LC1 and LC2, and behaves as a

normal passive ISO 144443A tag (PICC). After the anti-collision

protocol is passed, the PCD sends a Wake-Up command, which

wakes up the microcontroller by sending an interrupt. From this

point onwards, the AS3953B serves as a data link between the

microcontroller and the PCD. AS3953B can also operate as

NFCIP-1 target at 106kbit/s.

The AS3953B includes an onboard EEPROM that can be

accessed either from the PCD or from the microcontroller via

the SPI interface. This built-in flexibility makes it ideal for two

types of applications:

• Where personalization data is programmed by the PCD

(even in case the SPI side is not powered) and it is later

read by microcontroller through SPI interface.

• Where log data is stored periodically by the

microcontroller and can then be read by the PCD even

when the microcontroller is not powered.

A regulated power supply voltage extracted from the PCD field

is also available on a pin and can be used as power supply for

external circuitry. For example, an external microcontroller and

a sensor could be powered from the PCD field combined with

pass through data rates up to 848kbit/s, which means the

AS3953B is ideal for contactless passive programming of MCU

systems. The AS3953B can also operate as a stand-alone ISO

14443A tag.

The AS3953B supports ISO 14443A up to Level-4, meaning a

contactless smart card or an NFC forum compatible tag (Tag

Type 4) can be built. Having a NFC Forum compatible tag

interface allows the AS3953B to be used in an application where

a standard NFC enabled phone is used as a PCD.

Ordering Information and Content Guide appear at end of

datasheet.

General Description

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