AS3909 datasheet(29/77 Pages) AMSCO

29 / 77 page

ams Datasheet, Confidential: 2013-Oct [3-02]

AS3909/AS3910 – 29

Appl icatio n I n f o rm a t i o n

Note(s) and/or Footnote(s):

1. Only available in AS3910.

Set Default

This direct command puts the AS3909/10 in the same state as

power-up initialization. All registers are initialized to the default

state. Please note that results of different calibration and adjust

commands are also lost. This direct command is accepted in all

operating modes.

000111

Transmit WUPA

Transmits WUPA command (ISO-14443A mode only)

001000

NFC transmit with Initial RF

Collision Avoidance

Equivalent to Transmit with CRC with additional RF

Collision Avoidance

001001

NFC transmit with Response

RF Collision Avoidance

Equivalent to Transmit with CRC with additional RF

Collision Avoidance

001010

NFC transmit with Response

RF Collision Avoidance with

n=0

Equivalent to Transmit with CRC with additional RF

Collision Avoidance

010000

Mask receive data

Receive after this command is ignored

010001

Unmask receive data

Receive data following this command is 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 Converter Output Register

010011

Measure RF

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

Converter Output Register

010100

Squelch

Performs gain reduction based on the current noise

level.

010101

Clear Squelch

Resumes gain settings which were 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 (1)

Starts the sequence to adjust parallel capacitances

connected to TRIMx 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

Enter in Transparent mode

Code

Command

Comments

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