PRELIMINARY PRODUCT SPECIFICATION
nRF24L01 Single Chip 2.4 GHz Radio Transceiver
TX3
TX4
TX2
TX5
TX1
TX6
RX
Frequency Channel N
Figure 4: nRF24L01 in a star network configuration
An nRF24L01 configured as primary RX (PRX) will be able to receive data trough 6
different data pipes, see Figure 4. A data pipe will have a unique address but share the
same frequency channel. This means that up to 6 different nRF24L01 configured as
primary TX (PTX) can communicate with one nRF24L01 configured as PRX, and the
nRF24L01 configured as PRX will be able to distinguish between them. Data pipe 0
has a unique 40 bit configurable address. Each of data pipe 1-5 has an 8 bit unique
address and shares the 32 most significant address bits. All data pipes can perform full
Enhanced ShockBurst™ functionality.
nRF24L01 will use the data pipe address when acknowledging a received packet. This
means that nRF24L01 will transmit ACK with the same address as it receives payload
at. In the PTX device data pipe 0 is used to received the acknowledge, and therefore
the receive address for data pipe 0 has to be equal to the transmit address to be able to
receive the acknowledge. See Figure 5 for addressing example.
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway
Revision: 1.1
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Phone +4772898900
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Fax +4772898989
November 2005
Page 12 of 38
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