Connection of nRF21540 via SPI interface only

[backstreet.devisor]

Hello everyone!

Please tell me if I can connect nRF21540 to a microcontroller using only 4 SPI pins (SCK, MOSI, MISO, CSN) and control it completely? At the same time I want to leave MODE, RX_EN, ANT_SEL, TX_EN, PDN pins unconnected. 

Thank you.

[backstreet.devisor]

Great. Thanks for the help.
Do the SPI pins have to be grounded?

[Bendik Heiskel]

Due to errata 13, all the input pins need to be pulled low during power down state. But the CSN pin needs to be high when not in power down, in order to not need a MCU GPIO pin for the CSN pin it can be tied together with the PDN pin.

The MISO, MOSI and SCK pins can be grounded when not using SPI.

[backstreet.devisor]

Thank you very much, Bendik!

You helped me a lot.