Goouuu GT-U7 GT-U7

GT-U7 GPS Modules

1. Functional description

1.1 Overview

1.2 GPS performanc

1.3 Block diagram

1.4 Assisted GPS (A-GPS)

1.5 AssistNow Autonomous

1.6 Protocols and interfaces

1.6.1 UART

1.6.2 USB

1.6.3 Serial Peripheral Interface (SPI)

1.7 Antenna

1.8 Power Management

1.9 Maximum Performance Mode

1.10 Eco Mode

1.11 Power Save Mode

2 Pin Definition

2.1 Pin assignment

3 Electrical specifications

3.1 Absolute maximum ratings

3.2 Operating conditions

3.3 SPI timing diagrams

3.4 Timing recommendations

4 Mechanical specifications

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1. Functional description

1.1 Overview

The GT-U7 module series is a family of stand-alone GPS receivers featuring the high performance

u-blox 6 positioning engine. These flexible and cost effective receivers offer numerous

connectivity options in a miniature 16 x 12.2 x 2.4 mm package. Their compact architecture and

power and memory options make GT-U7 modules ideal for battery operated mobile devices with

very strict cost and space constraints. The 50-channel u-blox 6 positioning engine boasts a

Time-To-First-Fix (TTFF) of under 1 second. The dedicated acquisition engine, with 2 million

correlators, is capable of massive parallel time/frequency space searches, enabling it to find

satellites instantly. Innovative design and technology suppresses jamming sources and mitigates

multipath effects, giving GT-U7 GPS receivers excellent navigation performance even in the most

challenging environments.

1.2 GPS performanc

1.3 Block diagram

1.4 Assisted GPS (A-GPS)

Supply of aiding information like ephemeris, almanac, rough last position and time and satellite

status and an optional time synchronization signal will reduce time to first fix significantly and

improve the acquisition sensitivity. All GT-U7 modules support the u-blox AssistNow Online and

AssistNow Offline A-GPS services11 and are OMA SUPL compliant.

1.5 AssistNow Autonomous

AssistNow Autonomous provides functionality similar to Assisted-GPS without the need for a host

or external network connection. Based on previously broadcast satellite ephemeris data

downloaded to and stored by the GPS receiver, AssistNow Autonomous automatically generates

accurate satellite orbital data (“AssistNow Autonomous data”) that is usable for future GPS

position fixes. AssistNow Autonomous data is reliable for up to 3 days after initial capture.