NRF2402G Nordic VLSI, NRF2402G Datasheet - Page 18

• Manufacturer Part Number: NRF2402G
• Manufacturer: Nordic VLSI

1
false detection, which in the end may give lower data packet loss.
Direct mode will be dependent on the software used in the MCU, but it is recommended to have the
same restrictions on addresses for this mode.
Suggestions for the use of addresses in ShockBurst™: In general more bits in the address gives less
PRODUCT SPECIFICATION
nRF2402 Single Chip 2.4 GHz Radio Transmitter
DATA PACKAGE DESCRIPTION
The data packet for both ShockBurst™ mode and direct mode communication is
divided into 4 sections. These are:
1. PREAMBLE
2
3
4
The address made by (5, 4, 3, or 2) equal bytes are not recommended because it in general will make the
packet-error-rate increase.
Addresses where the level shift only one time (i.e. 000FFFFFFF) could often be detected in noise that may
give a false detection, which again may give raised packet-error-rate.
Nordic Semiconductor ASA
Revision: 2.1
PRE-AMBLE
ADDRESS
PAYLOAD
CRC
ADDRESS
-
Vestre Rosten 81, N-7075 Tiller, Norway
Figure 8 Data Package Diagram
and is not used in Direct mode.
The preamble field is a requirement for ShockBurst™ and Direct modes
Preamble is 8 bits in length and is dependent on the 1
Preamble is automatically added to the data packet and thereby gives
extra space for payload in ShockBurst™. Preamble must be added by
MCU in Direct mode
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 ShockBurst™ mode payload size is 256 bits minus the following:
(Address: 8 to 40 bits. + CRC 8 or 16 bits).
In Direct mode the maximum payload size is defined by 1Mbps for 4ms:
4000 bits minus the following: (Preamble: 8 bits. + Address: 0 to 40 bits.
+ CRC: 0, 8 or 16 bits).
On chip CRC calculation is an option in ShockBurst™ mode,
8 or 16 bits length
Table 14 Data package
PREAMBLE
01010101
10101010
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PAYLOAD
1
st
Data Bit (Address)
-
Phone [phone]
0
1
1
st
- Fax [phone]
data bit.
CRC
March 2006