AS3910-BQFP Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3910-BQFP Datasheet PDF : 47 Pages
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AS3910
Data Sheet - Application Information
Table 29. Antenna Driver Non-Modulated Level Definition
Address # 13: Antenna Driver Non-Modulated Level Definition
Bit
Name
Def.
Function
7
droff7
0
MSB
6
droff6
0
5
droff5
0
4
droff4
0
3
droff3
0
2
droff2
0
1
droff1
0
0
droff0
0
LSB
Note: Default setting is set at power up and after Set Default command.
8.11.7 NFCIP Field Detection Threshold Register
Table 30. NFCIP Field Detection Threshold
Address # 14: NFCIP Field Detection Threshold
Bit
Name
Def.
Function
7
trg_l3
Target activation level MSB
6
trg_l2
5
trg_l1
4
trg_l0
3
rfe_t3
Target activation level LSB
Collision avoidance threshold MSB
2
rfe_t2
1
rfe_t1
0
rfe_t0
Collision avoidance threshold LSB
Note: Default setting is set at power up and after Set Default command.
Table 31. Target Activation Threshold as seen on RFI1 Input
trg_l3
trg_l2
trg_l1
x
0
0
0
0
0
0
0
1
0
0
1
1
0
0
0
1
0
0
1
0
1
0
1
0
1
1
type: RW
Comments
Antenna drivers are composed of 8 binary weighted
segments. Setting a bit droff to 1 will disable
corresponding segment during normal non-modulated
operation.
type: RW
Comments
Threshold used to detect presence of
interrogator magnetic field. See Table 31 for
threshold definition.
Threshold used to detect presence of external
field during collision avoidance. See Table 32 for
threshold definition.
trg_l0
0
1
0
1
1
0
1
0
0
Target activation
threshold voltage
[mVpp on RFI1]
forbidden (measurement is
deactivated)
590
420
350
350
300
265
265
235
www.austriamicrosystems.com/HF_RFID_Reader/AS3910
Revision 2.3
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