AN3433 datasheet(4/34 Pages) STMICROELECTRONICS

Part #	AN3433

Description	Optimizing wakeup time and power consumption in CR95HF and STRFNFCA devices

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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4 / 34 page

Reference information

AN3433

4/34

Doc ID 019046 Rev 2

1

Reference information

1.1

Reference documents

CR95HF: 13.56 MHz Multi-protocol Contactless Transceiver IC with SPI and UART serial

access datasheet

STRFNFCA: Near field communication transceiver datasheet

1.2

Terms and acronyms

1.3

Notation conventions

The following symbols correspond to:

>>>: Frame sent by the host to CR95HF or STRFNFCA

<<<: Frame sent by the CR95HF or STRFNFCA to the host

Table 1.

List of terms and acronyms

Term

Meaning

AFE

Analog Front End

DAC

Digital-to-analog converter

DFT

Design for Test

NVM

Non Volatile Memory

RFID

Radio frequency identification

RFU

Reserved for Future Use

WFE

Wait For Event

Table 2.

List of characteristic values

Symbol

Definition

Value

CalRef

Tag Calibration Reference level and

DAC threshold level for device setup

DacDataH

High Level detection limit

DacDataL

Low Level detection limit

MaxSleep

Number of inactivity periods (tINACTIVE) before a timeout.

SwingCnt

Number of 13.56 MHz periods in the RF burst

tDAC

DAC set up time

tHFO

Period of RF carrier (13.56 MHz)

73 ns

tINACTIVE

Inactivity period, delay between two wakeups for RF burst

emissions in a Tag Detection sequence

tINACTIVE =

(WuPeriod+1)*tREF

tLFO

Period of device Low frequency oscillator (32 kHz)

31.25 µs

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