NRF24L01P-R7 datasheet(24/78 Pages) NORDIC

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nRF24L01+ Product Specification

6.1.6

Operational modes configuration

The following table (Table 15.) describes how to configure the operational modes.

Table 15. nRF24L01+ main modes

6.1.7

Timing Information

The timing information in this section relates 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 the standby

modes to TX mode or RX mode (max. 130µs), as described in Table 16.

Table 16. Operational timing of nRF24L01+

For nRF24L01+ to go from power down mode to TX or RX mode it must first pass through stand-by mode.

There must be a delay of Tpd2stby (see Table 16.) after the nRF24L01+ leaves power down mode before

the CE is set high.

Note: If VDD is turned off the register value is lost and you must configure nRF24L01+ before enter-

ing the TX or RX modes.

Mode

PWR_UP

PRIM_RX

input pin

FIFO state

RX mode

111

TX mode

Data in TX FIFOs. Will empty all

levels in TX FIFOsa.

a. If CE is held high all TX FIFOs are emptied and all necessary ACK and possible retransmits are car-

ried out. The transmission continues as long as the TX FIFO is refilled. If the TX FIFO is empty when

the CE is still high, nRF24L01+ enters standby-II mode. In this mode the transmission of a packet is

started as soon as the CSN is set high after an upload (UL) of a packet to TX FIFO.

TX mode

Minimum 10µs

high pulse

Data in TX FIFOs.Will empty one

level in TX FIFOsb.

b. This operating mode pulses the CE high for at least 10µs. This allows one packet to be transmitted.

This is the normal operating mode. After the packet is transmitted, the nRF24L01+ enters standby-I

mode.

Standby-II

TX FIFO empty.

Standby-I

No ongoing packet transmission.

Power Down

Name

nRF24L01+

Notes

Max.

Min.

Comments

Tpd2stby Power Down

Standby mode

150µs

With external clock

a. See Table 11. on page 19 for crystal specifications.

1.5ms

External crystal, Ls < 30mH

3ms

External crystal, Ls = 60mH

4.5ms

External crystal, Ls = 90mH

Tstby2a

Standby modes

TX/RX mode

130µs

Thce

Minimum CE high

10µs

Tpece2csn Delay from CE positive edge to CSN

low

4µs

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