NRF2401A Datasheet, PDF (19/38 Pages) List of Unclassifed Manufacturers – Single chip 2.4 GHz Transceiver

PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
ShockBurst™ configuration:
The section bit[119:16] contains the segments of the configuration register dedicated
to ShockBurst™ operational protocol. After VDD is turned on ShockBurst™
configuration is done once and remains set whilst VDD is present. During operation
only the first byte for frequency channel and RX/TX switching need to be changed.
PLL_CTRL
D121
0
0
1
1
PLL_CTRL
D120
PLL
0
Open TX/Closed RX
1
Open TX/Open RX
0
Closed TX/Closed RX
1
Closed TX/Open RX
Table 10 PLL setting.
Bit 121-120:
PLL_CTRL: Controls the setting of the PLL for test purposes. With closed
PLL in TX no deviation will be present. For normal operational
mode these two bits must both be low.
DATAx_W
DATA2_W
119 118 117 116 115 114 113 112
DATA1_W
111 110 109 108 107 106 105 104
Table 11 Number of bits in payload.
Bit 119 – 112:
DATA2_W: Length of RF package payload section for receive-channel 2.
Bit 111 – 104:
DATA1_W: Length of RF package payload section for receive-channel 1.
NOTE:
The total number of bits in a ShockBurst™ RF package may not exceed 256!
Maximum length of payload section is hence given by:
DATAx _W (bits) = 256 − ADDR _W − CRC
Where:
ADDR_W: length of RX address set in configuration word B[23:18]
CRC: check sum, 8 or 16 bits set in configuration word B[17]
PRE: preamble, 8 bits are automatically included
Shorter address and CRC leaves more room for payload data in each package.
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
Page 19 of 38
December 2004