AS3910 datasheet(33/47 Pages) AMSCO

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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

Note:

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

8.11.7 NFCIP Field Detection Threshold Register

Note:

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

Table 29. Antenna Driver Non-Modulated Level Definition

Address # 13: Antenna Driver Non-Modulated Level Definition

type: RW

Bit

Name

Def.

Function

Comments

7droff7

MSB

Antenna drivers are composed of 8 binary weighted

segments. Setting a bit droff to 1 will disable

corresponding segment during normal non-modulated

operation.

6droff6

5droff5

4droff4

3droff3

2droff2

1droff1

0droff0

LSB

Table 30. NFCIP Field Detection Threshold

Address # 14: NFCIP Field Detection Threshold

type: RW

Bit

Name

Def.

Function

Comments

trg_l3

Target activation level MSB

Threshold used to detect presence of

interrogator magnetic field. See Table 31 for

threshold definition.

trg_l2

trg_l1

trg_l0

Target activation level LSB

3rfe_t3

Collision avoidance threshold MSB

Threshold used to detect presence of external

field during collision avoidance. See Table 32 for

threshold definition.

2rfe_t2

1rfe_t1

0rfe_t0

Collision avoidance threshold LSB

Table 31. Target Activation Threshold as seen on RFI1 Input

trg_l3

trg_l2

trg_l1

trg_l0

Target activation

threshold voltage

[mVpp on RFI1]

forbidden (measurement is

deactivated)

590

420

350

300

265

235

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