NRF52820-QDAA-R datasheet(176/437 Pages) NORDIC

176 / 437 page

Peripherals

CTEType

Sample spacing

AoD 1 µs slots

CTEINLINECONF.CTEINLINERXMODE1US

AoD 2 µs slots

CTEINLINECONF.CTEINLINERXMODE2US

Other

DFECTRL1.TSAMPLESPACING

Table 59: Sample spacing when CTEINLINECONF.CTEINLINECTRLEN is set and the device is in AoD RX mode

For AoA RX mode, the sample spacing after the reference period is determined by

DFECTRL1.TSWITCHSPACING, as listed in the following table.

DFECTRL1.TSWITCHSPACING

Sample spacing

2 µs

CTEINLINECONF.CTEINLINERXMODE1US

4 µs

CTEINLINECONF.CTEINLINERXMODE2US

Other

DFECTRL1.TSAMPLESPACING

Table 60: Sample spacing when CTEINLINECONF.CTEINLINECTRLEN is set and the device is in AoA RX mode

For the reference and switching periods, DFECTRL1.TSAMPLESPACINGREF and DFECTRL1.TSAMPLESPACING

can be used to achieve oversampling.

6.12.13 IEEE 802.15.4 operation

With the MODE=Ieee802154_250kbit the RADIO will comply with the IEEE 802.15.4-2006 standard

implementing its 250 kbps, 2450 MHz, O-QPSK PHY.

The IEEE 802.15.4 standard differs from Nordic's proprietary and Bluetooth® low energy modes. Notable

differences include modulation scheme, channel structure, packet structure, security, and medium access

control.

The main features of the IEEE 802.15.4 mode are:

• Ultra-low power 250 kbps, 2450 MHz, IEEE 802.15.4-2006 compliant link

• Clear channel assessment

• Energy detection scan

• CRC generation

6.12.13.1 Packet structure

The IEEE 802.15.4 standard defines an on-the-air frame/packet that is different from what is used in BLE

mode.

The following figure provides an overview of the physical frame structure and its timing.

PHY protocol data unit (PPDU)

Preamble sequence

SFD

Length

PHY payload

5 octets synchronization header (SHR)

1 octet

(PHR)

Maximum 127 octets (PSDU)

160 µs

32 µs

<=4064 µs

MAC protocol data unit (MPDU)

Figure 67: IEEE 802.15.4 frame format (PPDU)

The standard uses the term octet for an 8-bit storage unit within the PPDU. For timing, the value symbol is

used, and it has a duration of 16 µs.

The total usable payload (PSDU) is 127 octets, but when CRC is in use, this is reduced to 125 octets of

usable payload.

4463_156 v1.0

176

NRF52820-QDAA-R Datasheet(PDF) 176 Page - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 176 Page - Nordic Semiconductor

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

Datasheet Download

Link URL