NRF9E5 NORDIC SEMICONDUCTOR, NRF9E5 Datasheet - Page 25

• Manufacturer Part Number: NRF9E5
• Description: TRX, 430-928MHZ, MCU/ADC/PWM, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF9E5

• Receiving Current: 12.5mA
• Transmitting Current: 30mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
9.2.2 Typical ShockBurstTM RX
If TX_EN is set high while TRX_CE is kept high, the nRF905 would enter
ShockBurstTMTX and start a transmission according to the present contents in the SPI-
registers.
If TRX_CE or TX_EN is changed during an incoming packet, the nRF905 changes
mode immediately and the packet is lost. However, if the MCU is sensing the Address
Match (AM) pin, it knows when the chip is receiving an incoming packet and can
therefore decide whether to wait for the Data Ready (DR) signal or enter a different
mode.
To avoid spurious address matches it is recommended that the address length be 24 bits
or higher in length. Small addresses such as 8 or 16 bits can often lead to statistical
failures due to the address being repeated as part of the data packet. This can be avoided
by using a longer address.
Each byte within the address should be unique. Repeating bytes within the address
reduces the effectiveness of the address and increases its susceptibility to noise hence
increasing the packet error rate. The address should also have several level shifts (i.e.
10101100) to reduce the statistical effect of noise and hence reduce the packet error rate.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.3
1. ShockBurstTM RX is selected by setting TRX_CE high and TX_EN low.
2. After 650s nRF905 is monitoring the air for incoming communication.
3. When the nRF905 senses a carrier at the receiving frequency, Carrier Detect
4. When a valid address is received, Address Match (AM) pin is set high.
5. When a valid packet has been received (correct CRC found), nRF905
6. MCU sets the TRX_CE low to enter standby mode (low current mode).
7. MCU can clock out the payload data at a suitable rate via the SPI interface.
8. When all payload data is retrieved, nRF905 sets Data Ready (DR) and
9. The chip is now ready for entering ShockBurstTM RX, ShockBurstTM TX or
(CD) pin is set high.
removes the preamble, address and CRC bits, and the Data Ready (DR) pin is
set high.
Address Match (AM) low again.
power down mode.
Page 25 of 108
June 2006