NRF905 NORDIC SEMICONDUCTOR, NRF905 Datasheet - Page 10

• Manufacturer Part Number: NRF905
• Description: IC, TRANSCEIVER, 430 928MHZ, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF905

• Transmitting Current: 9mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Sensitivity Dbm: -100dBm
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To 3.6V
• Output Power: 10dBm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF905 Single Chip 433/868/915 MHz Radio Transceiver
5.4
If TX_EN is set low while TRX_CE is kept high, the nRF905 finishes transmitting
the outgoing packet and then enter RX-mode in the channel already programmed in
the RF-CONFIG register.
The ShockBurst
finishes regardless of what TRX_EN and TX_EN is set to during transmission. The
new mode is activated when the transmission is completed. Please see subsequent
chapters for detailed timing
For test purposes such as antenna tuning and measuring output power it is possible to
set the transmitter so that a constant carrier is produced. To do this TRX_CE must be
maintained high instead of being pulsed. In addition Auto Retransmit should be
switched off. After the burst of data has been sent then the device will continue to
send the unmodulated carrier.
Main office: Nordic Semiconductor ASA
Revision: 1.4
Typical ShockBurst
1. When the application MCU has data for a remote node, the address of the
2. MCU sets TRX_CE and TX_EN high, this activates a nRF905
3. nRF905 ShockBurst™:
4. If AUTO_RETRAN is set high, the nRF905 continuously retransmits the
5. When TRX_CE is set low, the nRF905 finishes transmitting the outgoing
receiving node (TX-address) and payload data (TX-payload) are clocked
into nRF905 via the SPI interface. The application protocol or MCU sets
the speed of the interface.
ShockBurst™ transmission.
packet until TRX_CE is set low.
packet and then sets itself into standby mode.
Radio is automatically powered up.
Data packet is completed (preamble added, CRC calculated).
Data packet is transmitted (100kbps, GFSK, Manchester-encoded).
Data Ready is set high when transmission is completed.
TM
mode ensures that a transmitted packet that has started always
TM
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June 2006