NRF2401AG Nordic VLSI, NRF2401AG Datasheet - Page 13

• Manufacturer Part Number: NRF2401AG
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
nRF2401A ShockBurst™ Receive:
MCU interface pins: CE, DR1, CLK1 and DATA (one RX channel receive)
Direct Mode
In direct mode the nRF2401A works like a traditional RF device. Data must be at
1Mbps ±200ppm, or 250kbps ±200ppm at low data rate setting, for the receiver to
detect the signals.
Direct Mode Transmit:
MCU interface pins: CE, DATA
Direct Mode Receive:
MCU interface pins: CE, CLK1, and DATA
Nordic Semiconductor ASA
Revision: 1.1
1. Correct address and size of payload of incoming RF packages are set when
2. To activate RX, set CE high.
3. After 200 µs settling, nRF2401A is monitoring the air for incoming
4. When a valid package has been received (correct address and CRC found),
5. nRF2401A then notifies (interrupts) the MCU by setting the DR1 pin high.
6. MCU may (or may not) set the CE low to disable the RF front end (low
7. The MCU will clock out just the payload data at a suitable rate (ex. 10
8. When all payload data is retrieved nRF2401A sets DR1 low again, and is
1. When application MCU has data to send, set CE high
2. The nRF2401A RF front end is now immediately activated, and after 200
3. All RF protocol parts must hence be implemented in MCU firmware
1. Once the nRF2401A is configured and powered up (CE high) in direct RX
2. CLK1 will also start to toggle as nRF2401A is trying to lock on to the
3. Once a valid preamble arrives, CLK1 and DATA will lock on to the
4. To enable the demodulator to re-generate the clock, the preamble must be
5. In this mode no data ready (DR) signals is available. Address and
nRF2401A is configured to ShockBurst™ RX.
communication.
nRF2401A removes the preamble, address and CRC bits.
current mode).
kbps).
ready for new incoming data package if CE is kept high during data
download. If the CE was set low, a new start up sequence can begin, see
Figure 16.
µs settling time, data will modulate the carrier directly.
(preamble, address and CRC).
mode, DATA will start to toggle due to noise present on the air.
incoming data stream.
incoming signal and the RF package will appear at the DATA pin with the
same speed as it is transmitted.
8 bits toggling hi-low, starting with low if the first data bit is low.
checksum verification must also be done in the receiving MCU.
- Vestre Rosten 81, N-7075 Tiller, Norway
Page 13 of 40
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March 2006