ST25R3918 datasheet(78/142 Pages) STMICROELECTRONICS

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Application information

ST25R3918

78/142

DS13490 Rev 1

4.5.15

Receiver configuration register 2

Address: 0Ch

Type: RW

Table 37. Receiver configuration register 2

Bit

Name

Default

Function

Comments

demod_mode

0: AM/PM demodulation

1: I/Q demodulation

Selects demodulator operation mode.

I/Q demodulation requires amd_sel = 1.

amd_sel

0: peak detector

1: mixer

Selects AM demodulator.

sqm_dyn

0: Squelch disabled

1: Automatic squelch activation

after end of TX

Squelch is activated 18.88 µs after end of TX,

and stops when the Mask receive timer reaches

the sqt<7:0> setting.

pulz_61

0: Squelch ratio 1

1: Squelch ratio 6/3

Select squelch trigger level.

Squelch triggers on signals that are 1 or 6/3 times

larger than the digitizing threshold.

– Ratio 1: recommended for ISO-A 106k

correlator, ISO-A HBR/ISO-B pulse decoder

and ISO-15693

– Ratio 6/3: recommended for ISO-A HBR/ISO-B

correlator

agc_en

0: AGC disabled

1: AGC enabled

2agc_m

0: AGC operates on first eight

sub-carrier pulses

1: AGC operates during

complete receive period

agc_alg

0: Algorithm with preset is used

1: Algorithm with reset is used

Algorithm with preset is recommended for

protocols with short SOF (like ISO14443A

fc / 128).

agc6_3

0: AGC ratio 3

1: AGC ratio 6

Select AGC trigger level.

AGC triggers on signals 3 or 6 times above the

minimum detectable signal level.

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