User's Manual
Table Of Contents
- Foreword
- Important Safety Information
- Contents
- About this Document
- Related Publications
- Product Description
- Features
- Specifications
- Air Interface
- Product Functionality
- Contents
- Integration Goal and Objectives
- Customer Problem Isolation
- Wireline and Wireless Communications
- Design Tips for Serviceability
- Environmental Issues
- Regulatory Requirements
- Contents
- Power Supply
- Host Interface
- Power Management
- Antenna Systems
- Hardware Recommendations
- Battery Selection Criteria
- Contents
- Hardware Integration
- Application Software
- Final Assembly
- Installation
- Troubleshooting
- End User Problem Resolution
- Service Depot Repair
- Contents
- Accessories and Options
- Abbreviations and Acronyms
- Desense Overview
- Desense Measurement Techniques
- Preparing the Device Under Test
- Performance Goals
- Methods of Controlling Emissions
- Antenna
- Summary
- FLEX Application Protocol Licensing
- Licensing
4-2 July 23, 2002
Hardware Integration CreataLink2 XT Hardware Integrator’s Guide
Power Supply
• Minimum operating voltage levels
• Shutdown procedures
• Device internal ambient temperature
• Antenna gain and proximity to user
• Repair and reprogramming facilities (pass-through mode of operation)
• Power outage and recovery issues, including the use of a backup battery
Battery-Powered Implementation
The CreataLink2 XT device can use battery power in three distinct ways.
Primary Power
Where there is no convenient access to ac line power, the data transceiver must be
powered by a battery. In addition to the design considerations noted previously, you
must also select an appropriate battery based on technology, capacity, and
operating limits.
The power supply voltage range is 5-12 Vdc for NUF3902 and 5-16 Vdc for
NUF8006. The power supply must be capable of supplying 1400 mA for
transmitter operation.
If no backup battery is connected or the backup battery lacks sufficient capacity,
AND the backup battery is used for transmitting, the following conditions
will result:
NUF8006: the unit will reset.
NUF3902: the unit will not transmit and will not reset.
RAM Backup Only
In this mode, a battery may be placed across pins 5 and 6 of the 22-pin connector.
When power on pins 1 and 2 fail, the CreataLink2 XT device automatically backs
up the contents of the RAM. This data will be available when primary power is
restored.
The battery voltage must be between 3 and 9 Vdc, and capable of supplying 1 mA.
RAM Backup and Transmitter/Receiver Supply
The NUF3902 CreataLink2 XT device can be configured via software to use the
main supply (pins 1 and 2 of the 22-pin connector) or the battery/secondary supply
(pins 5 and 6) for power. If the secondary supply is chosen, it will be used during
RF transmissions and while receiving. In addition, this voltage will be used to back
up the RAM contents in the event of a power failure.
The battery requirements in this case are the same as those listed in
Tables 2-1 and 2-3.
With this method of using the additional battery/alternate power besides the main
supply, the requirements of the primary supply change. The primary supply would
be required to provide 65-90 mA for normal operation. If required, I/O sourcing and
sinking currents would have to be added. As a result, this current could reach as
high as 1A.
The NUF8006 CreataLink2 XT is powered from the battery during RF
transmissions only when the Battery Transmit Option is used. With this
configuration, the main supply powers the CreataLink2 XT during Sleep and
Receive modes. The battery requirements are the same as those listed in
Tables 2-1 and 2-3.