Timing Information
The timing information in this section is related to the transitions between modes and the timing for the CE
pin. The transition from TX mode to RX mode or vice versa is the same as the transition from standby-I to
TX mode or RX mode,Tstby2a.
When nRF24L01 is in power down mode it must settle for 1.5ms before it can enter the TX or RX modes. If
an external clock is used this delay is reduced to 150ìs, see Table 13. on page 22. The settling time must
be controlled by the MCU.
Note: The register value is lost if VDD is turned off. In this case, nRF24L01 must be configured
before entering the TX or RX modes.
Air data rate
The air data rate is the modulated signaling rate the nRF24L01 uses when transmitting and receiving data.
The air data rate can be 1Mbps or 2Mbps. The 1Mbps data rate gives 3dB better receiver sensitivity compared
to 2Mbps. High air data rate means lower average current consumption and reduced probability of
on-air collisions.
The air data rate is set by the RF_DR bit in the RF_SETUP register.
A transmitter and a receiver must be programmed with the same air data rate to be able to communicate
with each other.
For compatibility with nRF2401A, nRF24E1, nRF2402 and nRF24E2 the air data rate must be set to
1Mbps.