ST95HF datasheet(37/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

5.9.1

Idle command parameters

The Idle command (Host to ST95HF) has the following structure (all values are

hexadecimal):

ST95HF to

Host

0x00

Result code

This response is sent only when

ST95HF 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>

Data (Wake-up source):

0x01: Timeout

0x02: Tag detect

0x08: Low pulse on

IRQ_IN pin

0x10: Low pulse on

SPI_SS pin

ST95HF 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.

Table 25. IDLE command description (continued)

Direction

Data

Comments

Example

Table 26. Idle command structure

yy zz

dd ee

Command

code

Data

length

source

Enter

Control

Leave

Control

Period

Osc

Start

DAC

Start

DAC

Data

Swing

Count

Max

Sleep

Table 27. 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

This byte defines the authorized wake-up sources in the Wake-up source

0x01

: Time out

0x02

: Tag Detection

0x04

: Field Detector

0x06

: Not defined

0x08

: Low pulse on IRQ_IN

0x10

: Low pulse on SPI_SS

Enter Control

These two bytes (EnterCtrlL and EnterCtrlH) define the resources when

entering WFE mode.

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

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