NRF2401 Datasheet, PDF (23/37 Pages) List of Unclassifed Manufacturers – Single chip 2.4 GHz Transceiver

PRODUCT SPECIFICATION
Q5) 6LQJOH &KLS  *+] 5DGLR 7UDQVFHLYHU
'$7$ 3$&.$*( '(6&5,37,21
PRE-AMBLE ADDRESS
PAYLOAD
Figure 11 Data Package Diagram
CRC
The data packet for both ShockBurst™ mode and direct mode communication is
divided into 4 sections. These are:
 35($0%/(
 $''5(66
 3$</2$'
 &5&
• The preamble field is required in ShockBurst™ and Direct modes
• Preamble is 8 (or 4) bits in length and is dependent of the first data bit in
direct mode.
PREAMBLE
1^st ADDR-BIT
01010101
0
10101010
1
• Preamble is automatically added to the data packet in ShockBurst™ and
thereby gives extra space for payload.
• In ShockBurst™ mode the preamble is stripped from the received output
data, in direct mode the preamble is transparent to the output data.
• The address field is required in ShockBurst™ mode.
• 8 to 40 bits length.
• Address automatically removed from received packet in ShockBurst™
mode. In Direct mode MCU must handle address.
• The data to be transmitted
• In Shock-Burst mode payload size is 256 bits minus the following:
(Address: 8 to 40 bits. + CRC 8 or 16 bits).
• In Direct mode the payload size is defined by 1Mbps for 4ms: 4000 bits
minus the following: (Preamble: 8 (or 4) bits. + Address: 8 to 40 bits. +
CRC: 0, 8 or 16 bits).
• The CRC is optional in ShockBurst™ mode,
and is not used in Direct mode.
• 8 or 16 bits length
• The CRC is stripped from the received output data.
Table 18 Data package description
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
Page 23 of 37
March 2003