PRODUCT SPECIFICATION
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 -Fax +4772898989
Revision: 1.4 Page 1 of 42 June 2006
FEATURES
APPLICATIONS
True single chip GFSK transceiver in a small
32-pin package (32L QFN 5x5mm)
ShockBurstTM mode for low power operation
Power supply range 1.9 to 3.6 V
Multi channel operation ETSI/FCC
Compatible
Channel switching time <650
s
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 packet
is received or transmitted
Address Match for detection of incoming
packet
Automatic retransmission of data packet
Automatic CRC and preamble generation
Low supply current (TX), typical 9mA
@ -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
ShockBurst
TM
feature automatically handles preamble and CRC. Configuration is
easily programmable by use of the SPI interface. Current consumption is very low, in
transmit only 9mA 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
Data rate
50
kbps
Supply current in transmit @ -10dBm output power
9
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
Table 1 nRF905 quick reference data.
Single chip 433/868/915 MHz Transceiver nRF905
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: 1.4 Page 3 of 42 June 2006
TABLE OF CONTENTS
1
Pin Functions .................................................................................................................... 4
2
Pin Assignment................................................................................................................. 5
3
Electrical Specifications ................................................................................................... 6
4
Current Consumption........................................................................................................ 8
5
Modes of Operation .......................................................................................................... 9
5.1
Active Modes ........................................................................................................... 9
5.2
Power Saving Modes ............................................................................................... 9
5.3
nRF ShockBurstTM Mode......................................................................................... 9
5.4
Typical ShockBurst
TM
TX...................................................................................... 10
5.5
Typical ShockBurst
TM
RX ..................................................................................... 12
5.6
Power Down Mode ................................................................................................ 14
5.7
Standby Mode ........................................................................................................ 14
6
Device Configuration...................................................................................................... 15
6.1
SPI Register Configuration .................................................................................... 15
6.2
SPI Instruction Set ................................................................................................. 16
6.3
SPI Timing ............................................................................................................. 17
6.4
RF Configuration Register Description .............................................................. 19
6.5
Register Contents ................................................................................................... 20
7
Important Timing Data ................................................................................................... 21
7.1
Device Switching Times ........................................................................................ 21
7.2
ShockBurst
TM
TX timing ....................................................................................... 21
7.3
ShockBurstTM RX timing ..................................................................................... 22
7.4
Preamble ................................................................................................................ 22
7.5
Time On Air ........................................................................................................... 23
8
Peripheral RF Information .............................................................................................. 24
8.1
Crystal Specification .............................................................................................. 24
8.2
External Clock Reference ...................................................................................... 24
8.3
Microprocessor Output Clock ................................................................................ 24
8.4
Antenna Output ...................................................................................................... 25
8.5
Output Power Adjustment...................................................................................... 25
8.6
Modulation ............................................................................................................. 25
8.7
Output Frequency................................................................................................... 26
8.8
PCB Layout and Decoupling Guidelines ............................................................... 27
9
nRF905 features.............................................................................................................. 28
9.1
Carrier Detect......................................................................................................... 28
9.2
Address Match ....................................................................................................... 28
9.3
Data Ready............................................................................................................. 28
9.4
Auto Retransmit ..................................................................................................... 29
9.5
RX Reduced Power Mode...................................................................................... 29
10
Package Outline.......................................................................................................... 30
10.1
Package marking .................................................................................................... 31
11
Application Examples ................................................................................................ 32
11.1
Differential Connection to a Loop Antenna........................................................... 32
11.2
PCB Layout Example; Differential Connection to a Loop Antenna...................... 33
11.3
Single ended connection to 50
antenna............................................................... 34
11.4
PCB Layout Example; Single Ended Connection to 50
Antenna ....................... 36
12
Absolute Maximum Ratings....................................................................................... 38
13
Glossary of Terms ...................................................................................................... 39
14
Definitions .................................................................................................................. 40
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: 1.4 Page 4 of 42 June 2006
1
PIN FUNCTIONS
Pin
Name
Pin function
Description
1
TRX_CE
Digital input
Enables chip for receive and transmit
2
PWR_UP
Digital input
Power up chip
3
uPCLK
Clock output
Output clock, divided crystal oscillator full-swing clock
4
VDD
Power
Power supply (+3V DC)
5
VSS
Power
Ground (0V)
6
CD
Digital output
Carrier Detect
7
AM
Digital output
Address Match
8
DR
Digital output
Receive and transmit Data Ready
9
VSS
Power
Ground (0V)
10
MISO
SPI - interface
SPI output
11
MOSI
SPI - interface
SPI input
12
SCK
SPI - Clock
SPI clock
13
CSN
SPI - enable
SPI enable, active low
14
XC1
Analog Input
Crystal pin 1/ External clock reference pin
15
XC2
Analog Output Crystal pin 2
16
VSS
Power
Ground (0V)
17
VDD
Power
Power supply (+3V DC)
18
VSS
Power
Ground
19
VDD_PA
Power output
Positive supply (1.8V) to nRF905 power amplifier
20
ANT1
RF
Antenna interface 1
21
ANT2
RF
Antenna interface 2
22
VSS
Power
Ground (0V)
23
IREF
Analog Input
Reference current
24
VSS
Power
Ground (0V)
25
VDD
Power
Power supply (+3V DC)
26
VSS
Power
Ground (0V)
27
VSS
Power
Ground (0V)
28
VSS
Power
Ground (0V)
29
VSS
Power
Ground (0V)
30
VSS
Power
Ground (0V)
31
DVDD_1V2
Power
Low voltage positive digital supply output for de-coupling
32
TX_EN
Digital input
TX_EN="1"TX mode, TX_EN="0"RX mode
Table 3 nRF905 pin function.
PDF 
ZIP
