AN3433 datasheet(8/34 Pages) STMICROELECTRONICS

8 / 34 page

Management of CR95HF or STRFNFCA activity

AN3433

8/34

Doc ID 019046 Rev 2

Table 4.

Idle command description

Direction

Data

Comments

Example

Host to

CR95HF or

STRFNFCA

Command code

Example of switch from Active

mode to Hibernate state:

>>>0x07 0E 08 04 00 04

00 18 00 00 00 00 00 00

00 00

Example of switch from Active

to WFE mode (wakeup by low

pulse on IRQ_IN pin):

>>>0x07 0E 08 01 00 38

00 18 00 00 00 00 00 00

00 00

Example of switch from Active

to WFE mode (wakeup by low

pulse on SPI_SS pin):

>>>0x07 0E 10 01 00 38

00 18 00 00 00 00 00 00

00 00

Example of wakeup by timeout

(7 seconds):

Duration before Timeout = 256

* tL * (WU period + 2) *

(MaxSleep + 1)

>>>0x07 0E 01 21 00 38

00 18 00 60 60 00 00 00

00 08

Example of switch from Active

to Tag Detector mode (wakeup

by tag detection or low pulse

on IRQ_IN pin) (32 kHz,

inactivity duration = 272 ms,

DAC oscillator = 3 ms, Swing

= 63 pulses of 13.56 MHz),

= Infinite sequence,

0B = Until

TimeOut:

>>>0x07 0E 0A 21 00 79

01 18 00 20 60 60 64 74

3F 08

Example of a basic Idle

command used during the Tag

Detection Calibration process:

>>>0x07 0E 03 A1 00 F8

01 18 00 20 60 60 00 xx

3F 01

where

xx is the DacDataH

value.

Length of data

Specifies authorized wakeup

sources and the LFO frequency

EnterCtrlL

Settings to enter WFE mode

EnterCtrlH

WUCtrlL

Settings to wake up from WFE

mode

WUCtrlH

LeaveCtrlL

Settings to leave WFE mode

(Default value = 0x1800)

LeaveCtrlH

Period of time between two tag

detection bursts. Also used to

specify the duration before

timeout.

Defines the Wait time for HFO to

stabilize: <OscStart> * tL

(Default value = 0x60)

Defines the Wait time for DAC to

stabilize: <DacStart> * tL

(Default value = 0x60)

Lower compare value for tag

detection (1).

This value must be set to

0x00

during Tag Detection

Calibration.

Higher compare value for tag

detection (1).

This is a variable used during

Tag Detection Calibration.

Number of swings HF during tag

detection (Default value = 0x3F)

Max. number of tag detection

trials before timeout (1).

This value must be set to

0x01

during Tag Detection

Calibration.

Also used to specify duration

before timeout.

MaxSleep must be:

0x00 < MaxSleep < 0x1F

AN3433 Datasheet(PDF) 8 Page - STMicroelectronics

AN3433 Datasheet(HTML) 8 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

Datasheet Download

Link URL