User Manual

Revision 1.0 Page 43 of 78
nRF24L01+ Product Specification
Figure 16. Timing of Enhanced ShockBurst™ for one packet upload (2Mbps)
In Figure 16. the transmission and acknowledgement of a packet is shown. The PRX device activates RX
mode (
CE=1), and the PTX device is activated in TX mode (CE=1 for minimum 10µs). After 130µs the
transmission starts and finishes after the elapse of T
OA
.
When the transmission ends the PTX device automatically switches to RX mode to wait for the ACK packet
from the PRX device. When the PRX device receives the packet it sets the interrupt for the host MCU and
switches to TX mode to send an ACK.
After the PTX device receives the ACK packet it sets the interrupt to
the MCU and clears the packet from the TX FIFO.
Standby 1 PLL Lock TX Standby 1
PTX IRQ
PTX MODE
UL
PTX CE
PTX SPI
T
OA
130usT
UL
PLL Lock
TX
RX
PLL Lock PLL Lock PLL LockPRX MODE
PRX IRQ
PRX CE
RX
PRX SPI
T
ESB Cycle
RX
IRQ:
TX DS
T
IRQ
Standby 1
>10us
130us 130us 130usT
ACK
IRQ:RX DR/DL
T
IRQ