User's Guide

Revision 1.0 Page 46 of 75
nRF24L01+ Preliminary Product Specification
7.10 Compatibility with ShockBurst™
You must disable Enhanced ShockBurst™ for backward compatibility with the nRF2401A, nRF2402,
nRF24E1 and nRF24E2. Set the register
EN_AA = 0x00 and ARC = 0 to disable Enhanced ShockBurst™.
In addition, the nRF24L01+ air data rate must be set to 1Mbps or 250kbps.
7.10.1 ShockBurst™ packet format
Figure 22. shows the packet format with MSB to the left.
Figure 22. A ShockBurst™ packet compatible with nRF2401/nRF2402/nRF24E1/nRF24E2 devices.
The ShockBurst™ packet format has a preamble, address, payload and CRC field that are the same as
the Enhanced ShockBurst™ packet format described in section 7.3 on page 27.
The differences between the ShockBurst™ packet and the Enhanced ShockBurst™ packet are:
• The 9 bit Packet Control Field is not present in the ShockBurst™ packet format.
• The CRC is optional in the ShockBurst™ packet format and is controlled by the
EN_CRC bit in the
CONFIG register.
Preamble 1 byte Address 3-5 byte Payload 1 - 32 byte
CRC 1-2
byte