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
4-16 July 23, 2002
Hardware Integration CreataLink2 XT Hardware Integrator’s Guide
Host Interface
Power Connection
The host must provide power to the data transceiver as follows.
NUF3902: 5 Vdc to 12 Vdc
NUF8006: 5 Vdc to 16 Vdc. For NUF8006 current usage, see Table 2-3 and Figures
2-3 through 2-5.
The numbers above reflect only the normal operating currents for the NUF3902
and NUF8006 CreataLink2 XT devices. If the parallel I/O port and RS-232 port are
to be used, the current draw due to these circuits must be included.
• The I/O port consists of six input/open collector outputs, and two input/driven
output lines. Worst case current occurs when the open collector lines are
configured as outputs and are driven low, while the driven outputs are driven
high. Each open collector output is capable of sinking 25 mA. Each driven out-
put is capable of sourcing 350 mA. Assuming these worst case values, an addi-
tional (6 * 25) + (2 * 350) = 850 mA is possible.
• RS-232 communication requires 3-4 mA of supply current when valid RS-232
signal levels are present. There are two methods to eliminate this current.
1. Use TTL voltage levels, and connect to pin 3 and pin 7 of the 22-pin connector.
2. Or, if RS-232 communication is a requirement, disable the host system’s
RS-232 transmitter when serial communication is inactive.
You must consider these specifications when you design the power supply. The
above scenario is a worst-case. Current usage varies based on operating modes and
I/O configuration.
You can adjust average current by selecting a custom battery save cycle option.
➧
All values in Tables 4-3 and 4-4 are approximate.
Table 4-3. NUF3902 Current Usage
a
a. CreataLink2 XT device operating currents only. I/O and
RS-232 currents must be added in to determine worst
case values.
Current Transmit Receive Sleep
Typical 1150 mA 65 mA 3-4 mA
Maximum 1400 mA 90 mA 5 mA
Table 4-4. NUF3902 Transmit Output versus Supply Current
TX Power 0.5 W 0.75W 1.0W 1.5W 2.0W
Supply Current 0.61A 0.71A 0.81A 1.01A 1.17A