nRF24LE1 Nordic VLSI, nRF24LE1 Datasheet - Page 39

• Manufacturer Part Number: nRF24LE1
• Manufacturer: Nordic VLSI

nRF24LE1 Preliminary Product Specification
3.4.10.1
In
received by the PRX the ACK packet is transmitted from the PRX to the PTX. The RX_DR IRQ is asserted
after the packet is received by the PRX, whereas the TX_DS IRQ is asserted when the packet is acknowl-
edged and the ACK packet is received by the PTX.
3.4.10.2
Figure 21.
packet is transmitted, the PTX enters RX mode to receive the ACK packet. After the first transmission, the
PTX waits a specified time for the ACK packet, if it is not in the specific time slot the PTX retransmits the
packet as shown in
Revision 1.1
Figure 20.
Figure 21. TX/RX cycles with ACK and the according interrupts when the first packet transmit fails
is a scenario where a retransmission is needed due to loss of the first packet transmit. After the
the basic auto acknowledgement is shown. After the packet is transmitted by the PTX and
PRX
Single transaction with ACK packet and interrupts
Single transaction with a lost packet
MCU PTX
MCU PRX
PTX
1 Radio Turn Around Delay
Figure 21.
Figure 20. TX/RX cycles with ACK and the according interrupts
Packet PID=1 lost
during transmission
UL
PRX
MCU PRX
MCU PTX
PTX
1 Radio Turn Around Delay
TX:PID=1
No address detected.
RX off to save current
UL
Packet received
IRQ: RX DR (PID=1)
130us
TX:PID=1
1
RX
ARD
39 of 191
RX
RX
Auto retransmit delay
elapsed
130us
130us
DL
Ack received
IRQ:TX DS (PID=1)
1
Packet received.
IRQ: RX DR (PID=1)
1
ACK:PID=1
Retransmit of packet
PID=1
RX
TX:PID=1
IRQ
130us
DL
ACK received
IRQ: TX DS (PID=1)
1
ACK:PID=1
RX
IRQ