AS3910 datasheet(45/77 Pages) AMSCO

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ams Datasheet, Confidential: 2013-Oct [3-02]

AS3909/AS3910 – 45

Appl icatio n I n f o rm a t i o n

Antenna Calibration Registers

Figure 36:

Antenna Calibration Register

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

Figure 37:

External Trim Register

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

Address # 0E: Antenna Calibration Register

Type: R

Bit

Name

Function

Comments

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.

6tri_2

5tri_1

tri_0

LSB

tri_err

→ antenna calibration error

Set when Calibrate antenna sequence was

not able to adjust resonance

Not used

Address # 0F: External Trim Register

Type: RW

Bit

Name

Def.

Function

Comments

7trim_s0

→ LC trim switches are

defined by result of Calibrate

antenna command

→ LC trim switches are

defined by bits tre_x written

in this register

Defines source of driving switches on TRIMx

pins

6tre_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

3tre_0

LSB

Not used

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