AS3955 datasheet(3/111 Pages) AMSCO

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[v1-01] 2015-Apr-29

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AS3955 − General Description

Applications

AS3955 is suited to a wide range of applications, including

• NFC connection handover (Bluetooth™,

Bluetooth Low Energy, Wi-Fi pairing)

• Equipment setup, service and configuration

• Firmware upgrades

• Activity and status logging

• Wireless authentication (e.g. access control to buildings

and equipment)

Typical Markets:

• EMV payment cards

• Consumer electronics, wearables and smart clothing

• Home appliances

• Automotive

• Industrial equipment and building automation

• Remote sensing

• Gaming

A typical system diagram is depicted in Figure 2.

At the presence of a 13.56 MHz field generated by a NFC device,

AS3955 powers up, notifies the microcontroller through a

wake-up signal and handles the tag activation sequence.

Depending on configuration, several operations are then

possible:

• AS3955 exchanges with the NFC device NDEF data stored

in the internal EEPROM

• The microcontroller exchanges with the NFC device NDEF

data stored in external memory

• The microcontroller exchanges data with AS3955. This

operation can be performed concurrently with

communication over the RF link, or also in absence of RF

power, in presence of an external supply.

Figure 2:

Typical System Diagram

AS3955

microcontroller

I²C or SPI

wake-up

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