ST25R3911B datasheet(30/116 Pages) STMICROELECTRONICS

Part #	ST25R3911B

Description	High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

PDF	116 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Figure 20. Direct command NFC response field ON

MS42451V1

TADT

TARFG

n x TRFW

Start

RF on

TRFW

Table 10. Timing parameters of NFC Field ON commands

Symbol

Parameter

Value

Unit

Comments

TIDT

Initial delay time

4096

/fc

NFC Initial Field ON

TRWF

RF waiting time

512

TIRFG

Initial guard time

NFC Initial Field ON

TADT

Active delay time

768

/fc

NFC response field ON

TARFG

Active guard time

1024

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 NFCIP bit rate detection display 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 Mode 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 Table 11.

ST25R3911B

Application information

DS11793 - Rev 6

page 30/116

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