AS3910-BQFP 查看數據表（PDF） - austriamicrosystems AG

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AS3910-BQFP

13.56 MHz RFID Reader IC, ISO-14443 A/B

austriamicrosystems AG 

AS3910

Data Sheet - Application Information

8.11.5 Antenna Calibration Registers

Table 24. Antenna Calibration Register

Address # 0E: Antenna Calibration Register

Bit

Name

Function

7

tri_3

MSB

6

tri_2

5

tri_1

4

tri_0

LSB

3

tri_err

1 → antenna calibration error

2

1

Not used

0

type: R

Comments

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.

Set when Calibrate antenna sequence was not able to adjust

resonance

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

Table 25. External Trim Register

Address # 0F: External Trim Register

Bit

Name

Def.

Function

0 → LC trim switches are defined by result of

Calibrate antenna command

7

trim_s

0

1 → LC trim switches are defined by bits tre_x

written in this register

6

tre_3

0 MSB

5

tre_2

0

4

tre_1

0

3

tre_0

0 LSB

2

1

Not used

0

type: RW

Comments

Defines source of driving switches on TRIMx pins

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.

Note: Default setting is set at power up and after Set Default command.

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