NRF52820-QDAA-R datasheet(174/437 Pages) NORDIC

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Peripherals

6.12.12.5 Receive- and transmit sequences

The addition of the CTE to the transmitted packet is illustrated in the following figure.

TXRU

TXIDLE

S0 L S1

PAYLOAD

CRC

TXIDLE

TXDISABLE

(carrier)

CTE

Figure 65: Transmit sequence with DFE

The prescence of CTE within a received packet is signalled by the CTEPRESENT event illustrated in the

figure below.

RXRU

RXIDLE

S0 L S1

PAYLOAD

CRC

RXIDLE

RXDISABLE

’X’

CTE

Figure 66: Receive sequence with DFE

6.12.12.6 Antenna switching

The RADIO can control up to 8 GPIO pins in order to control external antenna switches used in direction

finding.

Pin configuration

The eight antenna selection signals are mapped to physical pins according to the pin numbers specified

in the PSEL.DFEGPIO[n] registers. Only pins that have the PSEL.DFEGPIO[n].CONNECTED field set to

Connected will be controlled by the RADIO. Pins that are Disconnected will be controlled by GPIO.

During transmission in AoD TX mode or reception in AoA RX mode, the RADIO automatically acquires the

pins as needed. At times when the RADIO does not use the pin, the pin is released to its default state and

controlled by the GPIO configuration. Thus, the pin must be configured using the GPIO peripheral.

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NRF52820-QDAA-R Datasheet(PDF) 174 Page - Nordic Semiconductor