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nrf24l01+ with CE soldered to VCC

What do I need to take care of when I solder CE pin to VCC? (to save I/O) NRF is mostly in RXing state, and sometimes TXes.

So far I figured out to go from RX->TX mode I need to switch to Standby-II between. TX cannot be >4ms.

Anything else?

  • I would not recommend to solder CE to VCC, it's not following the intended operation of the chip. You can for instance skip connecting the IRQ pin, and pull for possible data at given intervals instead, but I recommend to connect CSN, CLK, MISO, MOSI and CE.

    Technically it is possible to switch between receive and transmit modes by only using the power up bit and keep CE high, but you will increase the response time due to startup of the crystal between changes, you will also enter transmit and receive mode before the crystal has settled, which will increase power consumption, and you will be operating the chip outside timing specifications (can lead to undefined behaviour).

    Best regards, Kenneth

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