ST25R3910 datasheet(24/65 Pages) STMICROELECTRONICS

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Functional overview

ST25R3910

24/65

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Set Default

This direct command puts the ST25R3910 in the same state as power-up initialization. All

registers are initialized to the default state.

Note:

Results of different calibration and adjust commands are also lost.

This direct command is accepted in all operating modes.

Clear

This direct command stops all current activities (transmission or reception) and clears FIFO.

It also clears collision and interrupt registers. This command has to be sent first in a

sequence preparing a transmission (except in case of direct commands Transmit REQA and

Transmit WUPA).

Transmit commands

All Transmit commands (Transmit With CRC, Transmit Without CRC, Transmit REQA and

Transmit WUPA) are accepted only in case the transmitter is enabled (bit tx_en is set).

010001

Unmask receive data

Received data following this command are normally

processed (this command has priority over internal

mask receive timer)

010010

AD convert

A/D conversion of signal on AD_IN pin is performed,

result is stored in A/D Output Register

010011

Measure RF

RF amplitude is measured, result is stored in A/D

Output Register

010100

Squelch

Performs gain reduction based on the current noise

level.

010101

Clear Squelch

Resumes gain settings in place before sending

Squelch command

010110

Adjust regulators

Adjusts supply regulators according to the current

supply voltage level

010111

Calibrate modulation depth

Starts sequence which activates the TX, measures the

modulation depth and adapts it to comply with the

specified modulation depth

011000

Calibrate antenna

Starts the sequence to adjust parallel capacitances

connected to TRIMx_y pins so that the antenna LC is

in resonance.

011001

Check antenna resonance

Measurement of antenna LC tank resonance to

determine whether calibration is needed.

011010

Clear RSSI

Clears RSSI bits and restarts the measurement

011100

Transparent mode

Enters in Transparent mode

Table 4. Direct commands (continued)

Code

Command

Comments

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