NRF24L01G NORDIC SEMICONDUCTOR, NRF24L01G Datasheet - Page 42

• Manufacturer Part Number: NRF24L01G
• Description: IC, RF TRANSCEIVER, 2.4-2.4835GHZ QFN-20
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF24L01G

• Transmitting Current: 11.3mA
• Data Rate: 2Mbps
• Frequency Range: 2.4GHz To 2.4835GHz
• Modulation Type: GFSK
• Sensitivity Dbm: -82dBm
• Rf Ic Case Style: QFN
• No. Of Pins: 20
• Sensitivity (dbm): -82dBm
• Supply Voltage Range: 1.9V To 3.6V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.9.4
Figure 18.
the PTX and received by the PRX the ACK packet with payload is transmitted from the PRX to the PTX.
The RX_DR IRQ is asserted after the packet is received by the PRX, whereas on the PTX side the TX_DS
IRQ is asserted when the ACK packet is received by the PTX. On the PRX side, the TX_DS IRQ for the
ACK packet payload is asserted after a new packet from PTX is received. The position of the IRQ in
18.
7.9.5
Figure 19.
on the PRX side is asserted. For the PTX both the TX_DS and RX_DR IRQ are asserted after the ACK
packet is received. After the second packet (PID=2) is received on the PRX side both the RX_DR (PID=2)
and TX_DS (ACK packet payload) IRQ are asserted.
Revision 2.0
shows where the MCU can respond to the interrupt.
PRX
MCU PRX
MCU PTX
PTX
1 Radio Turn Around Delay
2 Uploading Paylod for Ack Packet
3 Delay defined by MCU on PTX side, ≥ 130us
Figure 19. TX/RX cycles and the according interrupts when the packet transmission fails
is a scenario of the basic auto acknowledgement with payload. After the packet is transmitted by
is a scenario where the first packet is lost and a retransmission is needed before the RX_DR IRQ
Single transaction with ACK payload packet
Single transaction with ACK payload packet and lost packet
Packet PID=1 lost
during transmission
Figure 18. TX/RX cycles with ACK Payload and the according interrupts
UL1
PRX
MCU PTX
MCU PRX
PTX
1 Radio Turn Around Delay
2 Uploading Paylod for Ack Packet
3 Delay defined by MCU on PTX side, ≥ 130us
TX:PID=1
UL
2
No address detected.
RX off to save current
UL1
Packet received.
IRQ: RX DR (PID=1)
UL
130us
2
UL2
RX
TX:PID=1
1
RX
ARD
RX
ACK received
IRQ: TX DS (PID=1)
Auto retransmit delay
elapsed
RX DR (ACK1PAY)
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130us
130us
DL
UL2
Packet received.
IRQ: RX DR (PID=1)
1
1
ACK1 PAY
Retransmit of packet
PID=1
RX
TX:PID=1
≥
130us
IRQ
DL
nRF24L01 Product Specification
Packet received.
IRQ: RX DR (PID=2)
3
TX DS (ACK1PAY)
130us
ACK received
IRQ: TX DS (PID=1)
DL
Transmit of packet
PID=2
TX:PID=2
1
RX DR (ACK1PAY)
ACK1 PAY
RX
RX
≥
130us
IRQ
DL
IRQ
Packet received.
IRQ: RX DR (PID=2)
DL
3
TX DS (ACK1PAY)
TX:PID=2
RX
DL
Figure