RX95HF datasheet(22/44 Pages) STMICROELECTRONICS

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Commands

RX95HF

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DocID023884 Rev 3

Default setting: from POR to Ready state

After power-on, the RX95HF enters Power-up state.

To wake up the RX95HF and set it to Ready state, the user must send a low pulse on the

IRQ_IN pin. The RX95HF then automatically selects the external interface (SPI) and enters

Ready state and is able to accept commSands after a delay of approximately 6 ms (t3).

From Ready state to Hibernate state and back to Ready state

In Hibernate state, most resources are switched off to achieve an ultra-low power

consumption.

The only way the RX95HF can wake-up from Hibernate state is by an external event (low

pulse on pin IRQ_IN).

A basic Idle command is:

>>>0x07 0E 08 04 00 04 00 18 00 00 00 00 00 00 00 00

Note:

The Wake-up flag value is NOT significant when returning to Ready state from Hibernate

state or after a POR.

From Ready state to Sleep state and back to Ready state

Wake-up by external event (low pulse on IRQ_IN)

In Sleep or Power-up states, operating resources are limited in function of the selected

wake-up source to achieve a moderate power consumption level.

An Idle command example when wake-up source is pin IRQ_IN:

>>>0x07 0E 08 01 00 38 00 18 00 00 60 00 00 00 00 00

5.9

Read Register (RdReg) command (0x08) description

This command is used to read the Wakeup register.

Table 20. RDREG command description

Direction

Data

Comments

Example

Host to

RX95HF

0x08

Command code

Ex 1. >>>0x0803690100

Reads the ACC_A register. (1)

1. This command must be preceded by the setting of the ACC_A register index (0x0903680004).

0x03

Length of data

0x62

or 0x69 Register address

0x01

0x00

ST Reserved

RX95HF to

Host

0x00

Result code

<<<0x000127

See Section 5.10: Write Register (WrReg)

command (0x09) description for more

information on received register data.

<Len>

Length of data

RX95HF to

Host

0x82

Error code

<<<0x8200

Invalid command length

0x00

Length of data

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