STRFNFCA datasheet(32/74 Pages) STMICROELECTRONICS

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Commands

STRFNFCA

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Doc ID 023077 Rev 10

Table 21.

Idle command description

Direction

Data

Comments

Example

Host to

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 (wake-up by low pulse

on IRQ_IN pin):

>>>0x07 0E 08 01 00 38 00

18 00 00 60 00 00 00 00 00

Example of switch from Active to

WFE mode (wake-up by low pulse

on SPI_SS pin):

>>>0x07 0E 10 01 00 38 00

18 00 00 60 00 00 00 00 00

Example of switch from Active

mode to WFE mode (Sleep / Field

Detector with wake-up by Field

Detection) :

>>> 0x07 0E 04 01 42 38 00

18 00 00 60 00 00 00 00

Example of wake-up 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 (wake-up 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):

>>>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 wake-

up 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:

* tL

(Default value = 0x60)

Defines the Wait time for

DAC to stabilize:

* 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

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