ST25R3916B-AQWT datasheet(91/165 Pages) STMICROELECTRONICS

91 / 165 page

DS13541 Rev 7

91/165

ST25R3916B ST25R3917B

Application information

164

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|

1: Links the two AGC systems so that the

gain in the AM(I) and PM(Q) channels are

equal. To be used in summation mode.

0: The AM(I) and PM(Q) AGC channels are

independent. To be used in non-summation

mode.

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,

1st squelch step -100 mV

1: Vref -100 mV setting,

1st 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

correlator 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

(1)

0: Normal ref. time constant

1: Long ref. time const. (1.5x normal)

ST25R3916B-AQWT データシート(PDF) 91 Page - STMicroelectronics

ST25R3916B-AQWT データシート(HTML) 91 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

データシートダウンロード