User's Guide

Revision 1.0 Page 60 of 75
nRF24L01+ Preliminary Product Specification
Table 27. Register map of nRF24L01+
d. If ACK packet payload is activated, ACK packets have dynamic payload lengths and the Dynamic Payload
Length feature should be enabled for pipe 0 on the PTX and PRX. This is to ensure that they receive the
ACK packets with payloads. If the ACK payload is more than 15 byte in 2Mbps mode the ARD must be
500µS or more, and if the ACK payload is more than 5 byte in 1Mbps mode the ARD must be 500µS or
more. In 250kbps mode (even when the payload is not in ACK) the ARD must be 500µS or more.