ST25R3910 datasheet(47/65 Pages) STMICROELECTRONICS

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ST25R3910

1.3.14

A/D Output Register

Address: 0Dh

Type: R

1.3.15

Antenna Calibration Register

Address: 0Eh

Type: R

Table 21. A/D Output Register(1)

Bit

Name

Default

Function

Comments

7ad7

Displays result of A/D conversion

6ad6

5ad5

4ad4

3ad3

2ad2

1ad1

0ad0

1. At power-up and after Set Default command content of this register is set to 0.

Table 22. Antenna Calibration Register(1)

Bit

Name

Default

Function

Comments

7tri_3

MSB

This register stores result of Calibrate Antenna

command. LC trim switches are defined by data

written in this register in case trim_s = 0. A bit set

to 1 indicates that the corresponding transistor

on TRIM1_x and TRIM2_x pin is switched on.

6tri_2

5tri_1

4tri_0

LSB

tri_err

1: Antenna calibration error

Set when Calibrate Antenna sequence has not

been able to adjust resonance

Not used

1. At power-up and after Set Default command content of this register is set to 0.

ST25R3910 Datasheet(PDF) 47 Page - STMicroelectronics

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