nRF905
Single chip 433/868/915MHz Transceiver
Product Specification
Key Features
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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 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 out-
put power
Low supply current (RX), typical 12.5mA
Applications
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Wireless data communication
Alarm and security system
Home automation
Remote control
Surveillance
Automotive
Telemetry
Keyless entry
Toys
All rights reserved.
Reproduction in whole or in part is prohibited without the prior written permission of the copyright holder.
April 2008
nRF905 Product Specification
Liability disclaimer
Nordic Semiconductor ASA reserves the right to make changes without further notice to the product to
improve reliability, function or design. Nordic Semiconductor ASA does not assume any liability arising out
of the application or use of any product or circuits described herein.
All application information is advisory and does not form part of the specification.
Limiting values
Stress above one or more of the limiting values may cause permanent damage to the device. These are
stress ratings only and operation of the device at these or at any other conditions above those given in the
specifications are not implied. Exposure to limiting values for extended periods may affect device reliability.
Life support applications
These products are not designed for use in life support appliances, devices, or systems where malfunction
of these products can reasonably be expected to result in personal injury. Nordic Semiconductor ASA cus-
tomers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Nordic Semiconductor ASA for any damages resulting from such improper use or sale.
Data sheet status
Objective product specification
This product specification contains target specifications for product
development.
Preliminary product specification This product specification contains preliminary data; supplementary
data may be published from Nordic Semiconductor ASA later.
Product specification
This product specification contains final product specifications. Nordic
Semiconductor ASA reserves the right to make changes at any time
without notice in order to improve design and supply the best possible
product.
Contact details
Visit
www.nordicsemi.no
for Nordic Semiconductor sales offices and distributors worldwide
Main office:
Otto Nielsens vei 12
7004 Trondheim
Phone: +47 72 89 89 00
Fax: +47 72 89 89 89
www.nordicsemi.no
Revision 1.5
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nRF905 Product Specification
Writing conventions
This product specification follows a set of typographic rules that makes the document consistent and easy
to read. The following writing conventions are used:
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Commands, bit state conditions, and register names are written in
Courier.
Pin names and pin signal conditions are written in
Courier bold.
Cross references are
underlined and highlighted in blue.
Revision history
Date
June 2006
April 2008
Version
1.4
1.5
Description
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Restructured layout in the new template
Updated package information
Added moisture sensitivity level to the absolute maximum ratings
Attention!
Observe precaution for handling
Electrostatic Sensitive Device.
Datasheet order code: 051005nRF905
Revision 1.5
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nRF905 Product Specification
Contents
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7.1
7.2
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8.1
8.2
8.3
8.4
8.5
8.6
8.7
9
9.1
9.2
9.3
9.4
9.5
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10.1
10.2
10.3
10.4
10.5
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11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
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12.1
12.2
12.3
12.4
12.5
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Introduction ...............................................................................................
Quick reference data.................................................................................
Block Diagram ...........................................................................................
Absolute maximum ratings ......................................................................
Electrical Specifications...........................................................................
Current Consumption ...............................................................................
Pin information..........................................................................................
Pin Assignment ...................................................................................
Pin Functions .......................................................................................
Modes of Operation .................................................................................
Active Modes .......................................................................................
Power Saving Modes ..........................................................................
nRF ShockBurst™ Mode .....................................................................
Typical ShockBurst™ TX ....................................................................
Typical ShockBurst™ RX .....................................................................
Power Down Mode ...............................................................................
Standby Mode ......................................................................................
Device Configuration ...............................................................................
SPI Register Configuration...................................................................
SPI Instruction Set ..............................................................................
SPI Timing............................................................................................
RF – Configuration Register Description..............................................
Register Contents ................................................................................
Important Timing Data ..............................................................................
Device Switching Times .......................................................................
ShockBurst™ TX timing .......................................................................
ShockBurst™ RX timing.......................................................................
Preamble ..............................................................................................
Time On Air ..........................................................................................
Peripheral RF Information ........................................................................
Crystal Specification.............................................................................
External Clock Reference ...................................................................
Microprocessor Output Clock ...............................................................
Antenna Output ....................................................................................
Output Power Adjustment ....................................................................
Modulation ........................................................................................
Output Frequency ................................................................................
PCB Layout and Decoupling Guidelines ..............................................
nRF905 features .......................................................................................
Carrier Detect .......................................................................................
Address Match .....................................................................................
Data Ready ..........................................................................................
Auto Retransmit ...................................................................................
RX Reduced Power Mode....................................................................
Mechanical specifications........................................................................
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nRF905 Product Specification
14
Ordering information................................................................................. 34
14.1
Package marking.................................................................................. 34
14.1.1
Abbreviations ................................................................................... 34
14.2
Product options..................................................................................... 34
14.2.1
RF silicon ......................................................................................... 34
14.2.2
Development tools ........................................................................... 34
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Application Examples ............................................................................... 35
15.1
Differential Connection to a Loop Antenna........................................... 35
15.2
PCB Layout Example; Differential Connection to a Loop Antenna....... 36
15.3
Single ended connection to 50W antenna............................................ 37
15.4
PCB Layout Example; Single Ended Connection to 50W Antenna ...... 40
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Glossary of terms ..................................................................................... 41
Revision 1.5
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