ST25R95 datasheet(29/61 Pages) STMICROELECTRONICS

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Direction

Data

Comments

Example

ST25R95 to

Host

0x00

Result code

This response is sent only when

ST25R95 exits WFE mode.

<<<0x000101 Wake-up by Timeout

<<<0x000102 Wake-up by tag detect

<<<0x000108 Wake-up by low pulse

on IRQ_IN pin

0x01

Length of data

<Data>

bits function

•

7:6 LFO prescaler:

–

00: 1 (fLFO =32 kHz)

–

01: 2 (fLFO =16 kHz)

–

10: 4 (fLFO =8 kHz)

–

11: 8 (fLFO =4 kHz)

•

5 RFU

•

4 Wake-up source: low pulse on SPI_SS

•

3 Wake-up source: low pulse on IRQ_IN

•

2 Wake-up source: field detected

•

1 Wake-up source: tag detected

•

0 Wake-up source: timeout

ST25R95 to

Host

0x82

Error code

<<<0x8200 Invalid command length

0x00

Length of data

1. An initial calibration is necessary to determine DacDataL and DacDataH values required for leaving Tag

Detector state. For more information, contact your ST sales office for the corresponding application note.

5.9.1

Idle command parameters

The Idle command (Host to ST25R95) has the following structure (all values are hexadecimal):

Table 25. Idle command structure

yy zz

dd ee

Command

code

Data

length

source

Enter

Control

WU Control

Leave

Control

Period

Osc

Start

DAC

Start

DAC

Data

Swing

Count

Max

Sleep

Table 26. Summary of Idle command parameters

Parameter

Description

Command

code

This byte is the command code. ‘07’ represents the Idle command. This command switches the device from

Active mode to WFE mode.

Data length

This byte is the length of the command in bytes. Its value depends on the following parameter values.

WU source

7:6

LFO Prescaler

•

00: 1 (fLFO = 32 kHz)

•

01: 2 (fLFO = 16 kHz)

•

10: 4 (fLFO = 8 kHz)

•

11: 8 (fLFO = 4 kHz)

RFU

Wake-up sources: Low pulse on SPI_SS

Wake-up sources: Low pulse on IRQ_IN

Wake-up sources: Field detection

Wake-up sources: Tag detection

Wake-up sources: Timeout

ST25R95

Idle command (0x07) description

DS12807 - Rev 4

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