AS3911 datasheet(50/149 Pages) AMSCO

50 / 149 page

AS3911 – 50

ams Datasheet, Confidential: 2013-Oct [2-03]

A p pl i c at io n I n f o r m at i o n

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

1. The ‘Operation Mode’ column in the above table defines which Operation Control Register bits have to be set in order to accept a

particular command.

2. Was AD Convert in the AS3910

3. Called Measure RF in the AS3910

4. Called Check Antenna Resonance in the AS3910

5. This command is not accepted in case the external definition of the regulated voltage is selected in the Regulator Voltage Control

6. Accepted in all modes in case cs_mcal=0 (Capacitive Sensor Control Register), it is recommended to execute this command in

Power-down mode

7. Accepted in all modes, it is recommended to execute this command in Power-down mode.

8. Accepted only in the Initial NFC Target Mode

9. After termination of this command I_cat or I_cac IRQ is sent

10. Called Clear Squelch in the AS3910

Set Default

This direct command puts the AS3911 in the same state as

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

state. The only exception are IO Configuration Register 1, IO

Configuration Register 2 and Operation Control Register which

are not affected by Set Default command and are only set to

default state at power-up. Please note that results of different

calibration and adjust commands are also lost.

This direct command is accepted in all operating modes. In case

this command is sent while en (bit 7 of the Operation Control

cleared.

Direct command chaining is not allowed since this command

clears all registers.

IRQ due to termination of direct command is not produced.

Measure

Capacitance

Performs Capacitor Sensor

Measurement

Yes

(see note 7)

Measure Power

Supply

Yes

Start General

Purpose Timer

Yes

Start Wake-up

Timer

Yes

all

except wu

Start Mask-receive

Timer

Yes

(see note 8)

Start No-response

Timer

Yes

en, rx_en

Other Fx

Reserved for test

Other codes

Not used

Command

Code

(hex)

Command

Comments

Command

Chaining

Interrupt

after

Termination

Operation

Mode (1)

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