NRF24L01G NORDIC SEMICONDUCTOR, NRF24L01G Datasheet - Page 30

• 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

nRF24L01 Product Specification
nRF24L01 enters standby-I mode if there is no more untransmitted data in the TX FIFO and the CE pin is
low. If the ACK packet is not received, nRF24L01 goes back to TX mode after a delay defined by ARD and
retransmits the data. This continues until acknowledgment is received, or the maximum number of retrans-
mits is reached. Set PWR_UP =0 to abort auto retransmission. Two packet loss counters are incremented
each time a packet is lost, ARC_CNT and PLOS_CNT in the OBSERVE_TX register. The ARC_CNT counts
the number of retransmissions for the current transaction. The PLOS_CNT counts the total number of
retransmissions since the last channel change. You reset ARC_CNT by initiating a new transaction. You
reset PLOS_CNT by writing to the RF_CH register. It is possible to use the information in the OBSERVE_TX
register to make a overall assessment of the channel quality.
The ARD defines the time from the end of a transmitted packet to a retransmit starts on the PTX side. ARD
is set in SETUP_RETR register in steps of 250µs. A retransmit is made if no ACK packet is received by the
PTX.
There is a restriction for the length of ARD when using ACK packets with payload. The ARD time must
never be shorter than the sum of the startup time and the time on-air for the ACK packet.
For 1Mbps data rate and 5 byte address; 5 byte is maximum ACK packet payload length for ARD=250µs
(reset value).
For 2Mbps data rate and 5 byte address; 15 byte is maximum ACK packet payload length for ARD=250µs
(reset value).
ARD=500µs will be long enough for any payload length.
As an alternative to Auto Retransmit it is possible to manually set the nRF24L01 to retransmit a packet a
number of times. This is done by the REUSE_TX_PL command. The MCU must initiate each transmission
of the packet with the CE pin after this command has been used.
Revision 2.0
Page 30 of 74