PRODUCT SPECIFICATION
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 -Fax +4772898989
Revision: 1.1 Page 1 of 36 June 2004
Single chip 433/868/915 MHz Transceiver nRF905
FEATURES APPLICATIONS
• True single chip GFSK transceiver in a small
32-pin package (32L QFN 5x5mm)
• ShockBurst™ mode for low power operation
• Power supply range 1.9 to 3.6 V
• Multi channel operation – ETSI/FCC
Compatible
• Channel switching time <650µs
• Extremely low cost Bill of Material (BOM)
• No external SAW filter
• Adjustable output power up to 10dBm
• Carrier detect for "listen before transmit"
protocols
• Data Ready signal when a valid data package
is received or transmitted
• Address Match for detection of incoming
package
• Automatic retransmission of data packages
• Automatic CRC and preamble generation
• Low supply current (TX), typical 11mA
@ -10dBm output power
• Low supply current (RX), typical 12.5mA
• Wireless data communication
• Alarm and security systems
• Home Automation
• Remote control
• Surveillance
• Automotive
• Telemetry
• Industrial sensors
• Keyless entry
• Toys
GENERAL DESCRIPTION
nRF905 is a single-chip radio transceiver for the 433/868/915 MHz ISM band. The
transceiver consists of a fully integrated frequency synthesiser, receiver chain with
demodulator, a power amplifier, a crystal oscillator and a modulator. The
ShockBurstTM feature automatically handles preamble and CRC. Configuration is
easily programmable by use of the SPI interface. Current consumption is very low, in
transmit only 11mA at an output power of -10dBm, and in receive mode 12.5mA.
Built in power down modes makes power saving easily realizable.
QUICK REFERENCE DATA
Parameter Value Unit
Minimum supply voltage 1.9 V
Maximum transmit output power 10 dBm
Transmitted data rate (Manchester-encoder embedded) 100 kbps
Supply current in transmit @ -10dBm output power 11 mA
Supply current in receive mode 12.5 mA
Temperature range -40 to +85 °C
Typical Sensitivity -100 dBm
Supply current in power down mode 2.5 µΑ
Table 1 nRF905 quick reference data.
PRODUCT SPECIFICATION
nRF905 Single Chip 433/868/915 MHz Radio Transceiver
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 -Fax +4772898989
Revision: 1.1 Page 2 of 36 June 2004
ORDERING INFORMATION
Type Number Description Version
nRF905 IC 32L QFN 5x5mm -
nRF905-EVKIT 433 Evaluation kit 433MHz 1.0
nRF905-EVKIT 868/915 Evaluation kit 868/915MHz 1.0
Table 2 nRF905 ordering information.
BLOCK DIAGRAM
SPI
interface
ShockBurst
Demod
Dataslicer
Address
decode
CRC code/
decode
GFSK
filter
RX - reg.
Config-reg.
TX - reg.
TX - addr.
PA
LNA
IF BBF
Frequency
Synthesiser
Voltage
regulators Crystal
oscillator
MOSI (11)
MISO (10)
SCK (12)
CSN (13)
TRX_CE (1)
PWR_UP (2)
TX_EN (32)
CD (6)
AM (7)
DR (8)
uPCLK (3)
XC1 (14)
XC2 (15)
ANT1 (20)
ANT2 (21)
VDD_PA (19)
VSS (5)
VSS (16)
VSS (18)
VSS (21)
VSS (24)
VSS (27)
VSS (28)
VSS (29)
VSS (30)
VDD (4)
VDD (17)
VDD (25)
DVDD_1V2 (31)
IREF (23)
Manchester
encoder/
decoder
VSS (26)
VSS (9)
Figure 1 nRF905 with external components.
