DFECTRL1

nRF5340 Product Specification

Address offset: 0x910

Various configuration for Direction finding

Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID H H H H G G G G F F F E D D D C C C B A A A A A A
Reset 0x00023282 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 0 1 0 1 0 0 0 0 0 1 0
ID R/W Field Value ID Value Description
A

RW

NUMBEROF8US

Length of the AoA/AoD procedure in number of 8 µs units

Always used in TX mode, but in RX mode only when CTEINLINECTRLEN is 0

B

RW

DFEINEXTENSION

Add CTE extension and do antenna switching/sampling in this extension

CRC

1

AoA/AoD procedure triggered at end of CRC

Payload

0

Antenna switching/sampling is done in the packet payload

C

RW

TSWITCHSPACING

Interval between every time the antenna is changed in the SWITCHING state

4us

1

4 µs

2us

2

2 µs

1us

3

1 µs

D

RW

TSAMPLESPACINGREF

Interval between samples in the REFERENCE period

4us

1

4 µs

2us

2

2 µs

1us

3

1 µs

500ns

4

0.5 µs

250ns

5

0.25 µs

125ns

6

0.125 µs

E

RW

SAMPLETYPE

Whether to sample I/Q or magnitude/phase

IQ

0

Complex samples in I and Q

MagPhase

1

Complex samples as magnitude and phase

F

RW

TSAMPLESPACING

Interval between samples in the SWITCHING period when CTEINLINECTRLEN is 0

When CTEINLINECTRLEN is 1, CTEINLINERXMODE1US or CTEINLINERXMODE2US is used instead of TSAMPLESPACING.

4us

1

4 µs

2us

2

2 µs

1us

3

1 µs

500ns

4

0.5 µs

250ns

5

0.25 µs

125ns

6

0.125 µs

G

RW

REPEATPATTERN

Repeat each individual antenna pattern N times sequentially, i.e. P0, P0, P1, P1, P2, P2, P3, P3, etc.

NoRepeat

0

Do not repeat (1 time in total)

H

RW

AGCBACKOFFGAIN

Gain will be lowered by the specified number of gain steps at the start of CTE

At the start of receiving the CTE, the gain is lowered by the specified number of gain steps (approximately 3 dB ± 1 dB per step). The initial gain reduction is implemented in the analog front-end, thus the gain back-off can be used to prevent sample saturation.