u-blox LEA-5T User Manual

LEA-5, NEO-5, TIM-5H
u-blox 5 GPS Modules
Hardware Integration Manual
Abstract
This document describes the hardware features and specifications of
the cost effective and high-performance LEA-5, NEO-5 and TIM-5H
GPS modules featuring the u-blox 5 positioning engine.
These compact, easy to integrate stand-alone GPS receiver modules
combine exceptional GPS performance with highly flexible power,
design, and connectivity options. Their compact form factors and
SMT pads allow fully automated assembly with standard pick &
place and reflow soldering equipment for cost-efficient, high-
volume production enabling short time-to-market.
locate, communicate, accelerate
www.u-blox.com

u-blox LEA-5T Specifications

General

Navigation Sensitivity	-160 dBm
Acquisition Sensitivity	-148 dBm
Hot Start TTFF	1 s
Reacquisition	1 s
Position Accuracy	2.5 m CEP
SBAS Accuracy	2.0 m CEP
Velocity Accuracy	0.1 m/s
Time Accuracy	30 ns
Update Rate	Up to 4 Hz
Protocols	NMEA, UBX binary
Operating Voltage	2.7 V to 3.6 V
Jamming Immunity	Yes
Frequency	L1, 1575.42 MHz
Power Consumption	50 mA
Operating Temperature	-40°C to +85°C
Interface	UART, USB
Antenna Type	Active and passive
Receiver Type	50-channel u-blox 5 positioning engine

Summary

Hardware Description

Power Management

Covers power supply pins (VCC, V_BCKP, VDD_USB) and operating modes (Max Performance, Eco, Power Save).

Interfaces

Describes UART, USB, DDC, and SPI interfaces, including external component requirements.

Design-in

Design-in Checklist

Provides a checklist for a successful GPS module design-in, covering power supply and layout.

Design Considerations

LEA-5 Design

Layout

Provides recommendations for PCB layout, including footprint, paste mask, placement, and grounding.

Antenna Connection and Grounding Plane Design

Explains optimal antenna connection, grounding, and micro strip routing for signal integrity.

Antenna Micro Strip

Details the calculation and design of micro strips for impedance matching in RF connections.

Antenna and Antenna Supervisor

Covers antenna types, bias voltage, and supervisor circuits for active antennas.

EOS/ESD/EMI Precautions

Advises on precautions for Electrostatic Discharge (ESD), Electrical Overstress (EOS), and Electromagnetic Interference (EMI).

Handling and Soldering

ESD Handling Precautions

Essential safety practices for handling ESD-sensitive components and modules.

Soldering

Covers soldering paste, reflow, inspection, cleaning, rework, and other soldering-related processes.