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nRF2401AG-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40
PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.1 Page 22 of 40 March 2006
General device configuration:
This section of the configuration word handles RF and device related parameters.
Modes:
RX2_EN CM RFDR_SB XO_F RF_PWR
15 14 13 12 11 10 9 8
Table 14 RF operational settings.
Bit 15:
RX2_EN:
Logic 0: One channel receive
Logic 1: Two channels receive
NOTE:
In two channels receive, the nRF2401A receives on two, separate
frequency channels simultaneously. The frequency of receive channel
1 is set in the configuration word bit[7-1], receive channel 2 is always
8 channels (8 MHz) above receive channel 1.
Bit 14:
Communication Mode:
Logic 0: nRF2401A operates in direct mode.
Logic 1: nRF2401A operates in ShockBurst™ mode
Bit 13:
RF Data Rate:
Logic 0: 250 kbps
Logic 1: 1 Mbps
NOTE:
Utilizing 250 kbps instead of 1Mbps will improve the receiver
sensitivity by 10 dB. 1Mbps requires 16MHz crystal.
Bit 12-10:
XO_F: Selects the nRF2401A crystal frequency to be used:
XO FREQUENCY SELECTION
D12 D11 D10 Crystal Frequency [MHz]
0 0 0 4
0 0 1 8
0 1 0 12
0 1 1 16
1 0 0 20
Table 15 Crystal frequency setting.
PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.1 Page 23 of 40 March 2006
Bit 9-8:
RF_PWR: Sets nRF2401A RF output power in transmit mode:
RF OUTPUT POWER
D9 D8 P [dBm]
0 0 -20
0 1 -10
1 0 -5
1 1 0
Table 16 RF output power setting.
RF channel & direction
RF_CH# RXEN
7 6 5 4 3 2 1 0
Table 17 Frequency channel and RX / TX setting.
Bit 7 – 1:
RF_CH#: Sets the frequency channel the nRF2401A operates on.
The channel frequency in transmit is given by:
MHzCHRFMHzChannel
RF
0.1#_2400 ⋅+=
RF_CH #: between 2400MHz and 2527MHz may be set.
The channel frequency in
data channel 1 is given by:
MHzCHRFMHzChannel
RF
0.1#_2400 ⋅+= (Receive at PIN#8)
RF_CH #: between 2400MHz and 2524MHz may be set.
NOTE:
The channels above 83 can only be utilized in certain territories (ex: Japan)
The channel frequency in
data channel 2 is given by:
MHzCHRFMHzChannel
RF
0.1#_2400 ⋅+= +8MHz (Receive at PIN#4)
RF_CH #: between 2408MHz and 2524MHz may be set.
Bit 0:
Set active mode:
Logic 0: transmit mode
Logic 1: receive mode
PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.1 Page 24 of 40 March 2006
DATA PACKAGE DESCRIPTION
PRE-AMBLE ADDRESS PAYLOAD CRC
Figure 11 Data Package Diagram
The data packet for both ShockBurst™ mode and direct mode communication is
divided into 4 sections. These are:
1. PREAMBLE
• The preamble field is required in ShockBurst™ and Direct modes.
• Preamble is 8 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 Direct mode MCU must handle
preamble.
In ShockBurst™ mode RX, the preamble is removed from the received output
data, in direct mode the preamble is transparent to the output data.
2 ADDRESS
• The address field is required in ShockBurst™ mode.
1
• 8 to 40 bits length.
• Address automatically removed from received packet in ShockBurst™
mode. In Direct mode MCU must handle address.
3 PAYLOAD
• 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 packet size (length) is for 1Mbps 4000 bits
(4ms).
4 CRC
• The CRC is optional in ShockBurst™ mode, and is not used in Direct
mode.
• 8 or 16 bits length
• The CRC is removed from the received output data in ShockBurst™ RX.
Table 18 Data package description
1
Suggestions for the use of addresses in ShockBurst™: In general more bits in the address gives less
false detection, which in the end may give lower data packet loss.
A. 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.
B. 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.
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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40

nRF2401AG-REEL7

Mfr. #:
Buy nRF2401AG-REEL7
Manufacturer:
Nordic Semiconductor
Description:
RF Transceiver 1.9-3.6V 1MBIT XCVR 2.4GHz SHCKBRST
Lifecycle:
New from this manufacturer.
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