ST25R3916 datasheet(88/157 Pages) STMICROELECTRONICS

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Application information

ST25R3916/7

88/157

DS12484 Rev 4

4.5.19

Correlator configuration register 1

Address: 0Ch

Type: RW

Table 46. Correlator configuration register 1

Bit Name

Default

Function

Comments

corr_s7

AGC = max |AM, PM|

corr_s6

ISO-A

106k

0: Collision detection level defined by

corr_s<1:0>

1: Collision detection level equal to data

slicer level

Selecting the collision detection level

with corr_s<1:0> gives better detection

of weak collisions. Setting the collision

detection level equal to the data slicer

gives better noise immunity.

BPSK

(1)

0: Correlator phase correction applied

during the complete reception

1: No correlator phase correction after the

first data bytes

No phase correction after start

recommended for ISO-B 424 kb/s and

848 kb/s operation.

corr_s5

0: Vref -50 mV setting, first squelch step -100 mV

1: Vref -100 mV setting,first squelch step -200 mV

corr_s4

0: AM and PM correlation signals digitized

separately

1: AM and PM correlation signals summed before

digitizing (summation mode)

Summation mode is recommended for

all correlation operations

corr_s3

0: RX bit rate 106kb/s = 17, RX bit rates 212 to

848 kb/s = 9

1: RX bit rate 106kb/s = 33, RX bit rates 212 to

848 kb/s = 17

BPSK start length setting (delay from

the start of a tags subcarrier signal to

the moment when a subcarrier start is

detected). Then circuit starts observing

for the first phase transition (9/17/33 ±

2 pilot pulses). At this moment the

sst<4:0> check for TR0 is done.

corr_s2

ISO-A

106k

0: Normal data slicer

1: Fast data slicer

BPSK(

0: Normal reference time constant

1: Long reference time constant

(1.5x normal)

corr_s1

ISO-A

106k

Collision level setting MSB

Collision detection level, compared to

data detection level:

– 00: 16%

– 01: 28%

– 10: 41%

–11: 53%

BPSK(

Subcarrier end detection level

0: 100%

1: 66%

corr_s0

ISO-A

106k

Collision level setting LSB

BPSK(

0: Subcarrier end detector disabled

1: Subcarrier end detector enabled

1. BPSK options apply to ISO-A HBR and ISO-B (all bit rates).

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