AS3956 datasheet(4/109 Pages) AMSCO

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[v1-10] 2018-Apr-27

AS3956 − General Description

This built-in flexibility makes it ideal for a number of

applications requiring non-volatile memory to be accessed

when the system is not powered, e.g.:

• personalization data is programmed by the NFC device

(even in case SPI / I²C is not powered) and it is later read

by microcontroller through SPI / I²C interface

• Log data is stored periodically by the microcontroller and

can then be read by the NFC device even when the

microcontroller is not powered

• A NDEF message is regularly modified by the

microcontroller (e.g. Bluetooth pin code, or Wi-Fi key, or

dynamic URL) and it is later read by a NFC device.

Block Diagram

The functional blocks of this device are shown below:

Figure 3:

AS3956 Block Diagram

AFE

NFC FORUM

TYPE 2 TAG

+TUNNELING/

EXTENDED

MODE LOGIC

EEPROM

4kbit

I²C/SPI

INTERFACE

POWER

MANAGER

VP_IO

IRQ

I²C/SPI

VSS

VP_REG

(Programmable

1.8-4.5V, 5mA max)

VP_INT

2.0V typ

VDD

LC1

LC2

AS3956

45pF

BUFFER

32byte

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