ST25R3911B datasheet(79/116 Pages) STMICROELECTRONICS

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1.3.36

Antenna calibration display register

Address: 23h

Type: R

Table 62. Antenna calibration display register

Bit Name Default

Function

Comments(1)

tri_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

corresponding transistor on TRIM1_x and TRIM2_x pin is switched on.

tri_2

tri_1

tri_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.

1.3.37

AM modulation depth control register

Address: 24h

Type: RW

Table 63. AM modulation depth control register

Bit Name Default

Function

Comments(1)

am_s 0

0: AM modulated level is defined by

bits mod5 to mod0. Level is adjusted

automatically by Calibrate

Modulation Depth command, see

Table 9. Direct commands

1: AM modulated level is defined by

bits dram7 to dram0.

mod5 0

MSB

See Section 1.2.20 AM modulation depth: definition and

calibration for details about AM modulation lavel definition.

mod4 0

mod3 0

mod2 0

mod1 0

mod0 0

LSB

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

ST25R3911B

Registers

DS11793 - Rev 6

page 79/116

ST25R3911B Datasheet(PDF) 79 Page - STMicroelectronics

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