AS3910-BQFP AMSCO [austriamicrosystems AG], AS3910-BQFP Datasheet - Page 31

• Manufacturer Part Number: AS3910-BQFP
• Description: 13.56 MHz RFID Reader IC, ISO-14443 A/B
• Manufacturer: AMSCO [austriamicrosystems AG]

AS3910
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
8.11.5 Antenna Calibration Registers
Table 24. Antenna Calibration Register
Note: At power up and after Set Default command content of this register is set to 0.
Table 25. External Trim Register
Note: Default setting is set at power up and after Set Default command.
www.austriamicrosystems.com/HF_RFID_Reader/AS3910
Bit
Bit
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Address # 0E: Antenna Calibration Register
Name
trim_s
tre_3
tre_2
tre_1
tre_0
Name
tri_err
tri_3
tri_2
tri_1
tri_0
Address # 0F: External Trim Register
Def.
0
0
0
0
0
1 → antenna calibration error
0 → LC trim switches are defined by result of
Calibrate antenna command
1 → LC trim switches are defined by bits tre_x
written in this register
MSB
LSB
Not used
Function
Not used
MSB
LSB
Function
Revision 2.3
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
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.
Comments
type: R
Comments
type: RW
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