ST25R95 datasheet(30/61 Pages) STMICROELECTRONICS

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Parameter

Description

Enter control

These two bytes (EnterCtrlL and EnterCtrlH) define the resources when entering WFE mode (see

Table 27. Ener, WU, and Leave Control resource configuration).

Recommended values:

•

0x0400: Hibernate

•

0x0100: Sleep (or 0x2100 if Timer source is enabled)

•

0x0142: Sleep (if Field detector source is enabled)

•

0xA200: Tag detector calibration

•

0x2100: Tag detection

WU control

These two bytes (WuCtrlL and WuCtrlH) define the wake-up resources (see Table 27. Ener, WU, and Leave

Control resource configuration).

•

0x0400: Hibernate

•

0x3800: Sleep/Field detector

•

0xB801: Tag detector calibration

•

0x3801: Tag detection

Leave control

These two bytes (LeaveCtrlL and LeaveCtrlH) define the resources when returning to Ready state (see

Table 27. Ener, WU, and Leave Control resource configuration).

Recommended values:

•

0x1800: Hibernate

•

0x1800: Sleep/Field detector

•

0x1800: Tag detector calibration

•

0x1800: Tag detection

WU period

This byte is the coefficient used to adjust the time allowed between two tag detections. Also used to specify

the duration before Timeout (Typical value: 0x20).

Duration before Timeout = 256 * tL * (WU period + 2) * (MaxSleep + 1)

Osc start

This byte defines the delay for HFO stabilization (recommended value: 0x60).

Defines the Wait time for HFO to stabilize:

<OscStart> * tL

DAC start

This byte defines the delay for DAC stabilization. (Recommended value: 0x60)

Defines the Wait time for DAC to stabilize:

<DacStart> * tL

DAC data

These two bytes (DacDataL and DacDataH) define the lower and higher comparator values, respectively.

These values are determined by a calibration process.

When using the demonstration board these values should be set to approximately 0x64 and 0x74,

respectively.

Swing count

This byte defines the number of HF swings allowed during Tag detection. (Recommended value: 0x3F)

Max sleep

This byte defines the maximum number of tag detection trials or the coefficient to adjust the maximum

inactivity duration before Timeout.

MaxSleep must be: 0x00 < MaxSleep < 0x1F

This value must be set to

0x01 during tag detection calibration.

Also used to specify duration before Timeout.

Duration before Timeout = 256 * tL * (WU period + 2) * (MaxSleep + 1) (Typical value: 0x28)

ST25R95

Idle command (0x07) description

DS12807 - Rev 4

page 30/61

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