AS3911 datasheet(55/159 Pages) AMSCO

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ams Datasheet

Page 55

[v2-11] 2016-Jun-13

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AS3911 − Application Information

Figure 39:

Direct Command NFC Response Field ON

Figure 40:

Timing Parameters of NFC Field ON Commands

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator amplitude is stable.

Go to Normal NFC Mode

This command is used to transition from NFC target bit rate

detection mode to normal mode. Additionally it copies the

content of the NFCIP Bit Rate Detection Display Register to the

Bit Rate Definition Register and correctly sets the bit tr_am in

the Auxiliary Definition Register.

Analog Preset

This command is used to preset Receiver and Transmitter

configuration based on state of Bit Rate Definition Register and

Bit Rate Definition Register. In case of Sub-carrier bit stream or

BPSK bit stream mode, this command should not be used. The

list of configuration bits that are preset is given in Figure 41.

Symbol

Parameter

Value

Unit

Note

TIDT

Initial delay time

4096

/fc

NFC Initial Field ON

TRWF

RF waiting time

512

/fc

TIRFG

Initial guard time

NFC Initial Field ON

TADT

Active delay time

768

/fc

NFC Response Field ON

TARFG

Active guard time

1024

/fc

NFC Response Field ON

Start

RF On

TRFW

TARFG

n x TRFW

TADT

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