NRF24L01P-R datasheet(22/78 Pages) NORDIC

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nRF24L01+ Product Specification

Figure 4. Radio control state diagram

6.1.2

Power Down Mode

In power down mode nRF24L01+ is disabled using minimal current consumption. All register values avail-

able are maintained and the SPI is kept active, enabling change of configuration and the uploading/down-

loading of data registers. For start up times see Table 16. on page 24. Power down mode is entered by

setting the PWR_UP bit in the CONFIG register low.

6.1.3

Standby Modes

6.1.3.1

Standby-I mode

By setting the PWR_UP bit in the CONFIG register to 1, the device enters standby-I mode. Standby-I mode is

used to minimize average current consumption while maintaining short start up times. In this mode only

part of the crystal oscillator is active. Change to active modes only happens if CE is set high and when CE

is set low, the nRF24L01 returns to standby-I mode from both the TX and RX modes.

VDD >= 1.9V

Undefined

Power on

reset

100ms

Power Down

Standby-I

RX Mode

TX Mode

Standby-II

RX Settling

130 µs

Crystal

oscillator

start up

Tpd2stby

PWR_UP = 1

PWR_UP = 0

TX Settling

130 µs

TX FIFO not empty

PRIM_RX = 0

CE = 1 for more than 10µs

PRIM_RX = 1

CE = 1

CE = 0

TX FIFO empty

CE = 1

TX FIFO not empty

CE = 1

PRIM_RX = 0

TX FIFO empty

CE = 1

PWR_UP = 0

PWR_UP=0

CE = 0

PWR_UP=0

TX finished with one packet

CE = 0

CE = 1

TX FIFO not empty

Possible operating mode

Recommended path between operating modes

Possible path between operating modes

Recommended operating mode

Transition state

CE = 1

Pin signal condition

PWR_DN = 1

Bit state condition

Undefined

TX FIFO empty

System information

Undefined

Legend:

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