ST25R3910 datasheet(51/65 Pages) STMICROELECTRONICS

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ST25R3910

1.3.21

NFCIP Field Detection Threshold Register

Address: 14h

Type: RW

Table 28. NFCIP Field Detection Threshold Register(1)

Bit

Name

Default

Function

Comments

trg_l3

Target activation level MSB

Threshold used to detect presence of interrogator

magnetic field. See Table 29 for threshold

definition.

trg_l2

trg_l1

trg_l0

Target activation level LSB

trg_t3

Collision avoidance threshold MSB

Threshold used to detect presence of external

field during collision avoidance. See Table 30 for

threshold definition.

trg_t2

trg_t1

trg_t0

Collision avoidance threshold LSB

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

Table 29. Target activation threshold as seen on RFI1 input

trg_l3

trg_l2

trg_l1

trg_l0

Target activation threshold voltage

Forbidden (measurement is deactivated)

0001

590 mVpp

0010

420 mVpp

0011

350 mVpp

1001

350 mVpp

0100

300 mVpp

0101

265 mVpp

1010

265 mVpp

0110

235 mVpp

0111

220 mVpp

1011

220 mVpp

1100

190 mVpp

1101

175 mVpp

1110

155 mVpp

1111

145 mVpp

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