ST25R3911B datasheet(78/116 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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78 / 116 page

1.3.34

Antenna calibration control register

Address: 21h

Type: RW

Table 60. Antenna calibration control register

Bit Name Default

Function

Comments(1)

trim_s 0

0: LC trim switches are

defined by result of

Calibrate Antenna

command, see Table 9

1: LC trim switches are

defined by bits tre_x written

in this register

Defines source of driving switches on TRIMx pins

tre_3

MSB

LC trim switches are defined by data written in this register in case

trim_s=1. A bit set to 1 switch on transistor on TRIM1_x and TRIM2_x pin.

tre_2

tre_1

tre_0

LSB

1. Default setting takes place at power-up and after Set Default command

1.3.35

Antenna calibration target register

Address: 22h

Type: RW

Table 61. Antenna calibration target register

Bit

Name

Default

Function

Comments(1)

act7

Define target phase for Calibrate Antenna direct command, see Table 9

act6

act5

act4

act3

act2

act1

act0

1. Default setting takes place at power-up and after Set Default command.

ST25R3911B

Registers

DS11793 - Rev 6

page 78/116

ST25R3911B Datasheet(PDF) 78 Page - STMicroelectronics

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