AS3909 datasheet(48/77 Pages) AMSCO

48 / 77 page

AS3909/AS3910 – 48

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

A p pl i c at io n I n f o r m at i o n

Figure 42:

NFCIP Field Detection Threshold

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

NFCIP Field Detection Threshold Register

Figure 43:

Target Activation Threshold as seen on RFI1 Input

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 Figure 43

for threshold definition.

trg_l2

trg_l1

trg_l0

Target activation level LSB

rfe_t3

Collision avoidance threshold

MSB

Threshold used to detect presence of

external field during collision avoidance. See

Figure 44 for threshold definition.

rfe_t2

rfe_t1

rfe_t0

Collision avoidance threshold

LSB

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

220

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