Ublox LEA-6/NEO-6 GPS模块集成手册：高性价比设计指南

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LEA-6 / NEO-6 - Hardware Integration Manual

GPS.G6-HW-09007-A Preliminary Hardware description

Page 11 of 62

The Power Save mode is an autonomous mode that does not require dynamic interaction by the application

engine, i.e. after the configuration settings communicated to the u-blox 6 receiver, the application does not

need to take care of switching off and on the receiver to obtain low power consumption.

With NEO-6G the Power Save Mode does not achieve lowest possible current during backup mode (SW backup

current). This leads to reduced power savings only for the combination of very long off-times (several hours) and

1.8 V supply. For this scenario, better current savings can be achieved if the Module is externally turned off.

Please refer to the u-blox 6 Receiver Description including Protocol Specification [3] for more information. This

document is available on the

ublox website.

Power Save mode is not available with LEA-6R.

1.4 Antenna supply - V_ANT (LEA-6)

LEA-6 modules support active antenna supply and supervision use the pin V_ANT to supply the active antenna.

Use a 10R resistor in front of V_ANT. For more information about antenna and antenna supervisor see chapter

2.5.

1.5 System functions

1.5.1 EXTINT - External interrupt pin

EXTINT0 is an external interrupt pin used for the time mark function on LEA-6T.

It can be used for wake-up functions in Power Save mode on all LEA-6 and NEO-6 modules.

1.5.2 System monitoring

The u-blox-6 receiver modules provide system monitoring functions that allow the operation of the embedded

processor and associated peripherals to be supervised. These System Monitoring functions are output as part of

the UBX protocol, class ‘MON’.

Please refer to the u-blox 6 Receiver Description including Protocol Specification [3]. For more information on

UBX messages, serial interfaces for design analysis and individual system monitoring functions.

1.6 Interfaces

1.6.1 UART

u-blox 6 modules include a Universal Asynchronous Receiver Transmitter (UART) serial interface. RxD1/TxD1

supports data rates from 4.8 to 230.4 kBit/s. The signal output and input levels are 0 V to VCC. An interface

based on RS232 standard levels (+/- 12 V) can be realized using level shifters such as Maxim MAX3232.

Hardware handshake signals and synchronous operation are not supported.

For the default settings see the module data sheet.

1.6.2 USB

The u-blox 6 Universal Serial Bus (USB) interface supports the full-speed data rate of 12 Mbit/s.

1.6.2.1 USB external components

The USB interface requires some external components in order to implement the physical characteristics required

by the USB 2.0 specification. These external components are shown in Figure 4 and listed in Table 1.

In order to comply with USB specifications, VBUS must be connected through a LDO (U1) to pin VDD_USB of

the module.

If the USB device is self-powered it is possible that the power supply (VCC) is shut down and the Baseband-IC

core is not powered. Since VBUS is still available, it still would be signaled to the USB host that the device is

present and ready to communicate. This is not desired and thus the LDO (U1) should be disabled using the

LEA-6 / NEO-6 - Hardware Integration Manual

GPS.G6-HW-09007-A Preliminary Hardware description

Page 12 of 62

enable signal (EN) of the VCC-LDO or the output of a voltage supervisor. Depending on the characteristics of the

LDO (U1) it is recommended to add a pull-down resistor (R11) at its output to ensure VDD_USB is not floating if

LDO (U1) is disabled or the USB cable is not connected i.e. VBUS is not supplied.

If the device is bus-powered, LDO (U1) does not need an enable control.

Module

VDD_USB

LDO

VDD_USB

USB_DP

USB_DM

C24 C23

VBUS

GND

USB Device Connector

R11

Figure 4: USB Interface

Name Component Function Comments

U1 LDO Regulates VBUS (4.4 …5.25 V)

down to a voltage of 3.3 V.

Almost no current requirement (~1 mA) if the GPS receiver is operated as a USB

self-powered device, but if bus-powered LDO (U1) must be able to deliver the

maximum current of ~150 mA. A low-cost DC/DC converter such as LTC3410

from Linear Technology may be used as an alternative.

C23,

C24

Capacitors Required according to the specification of LDO U1

D2 Protection

diodes

Protect circuit from overvoltage

/ ESD when connecting.

Use low capacitance ESD protection such as ST Microelectronics USBLC6-2.

R4, R5 Serial

termination

resistors

Establish a full-speed driver

impedance of 28…44 Ohms

A value of 22 Ohms is recommended.

R11 Resistor 10k R is recommended for USB self-powered setup. For bus-powered setup

R11 can be ignored.

Table 1: Summary of USB external components

1.6.3 Display Data Channel (DDC)

An I

C compatible Display Data Channel (DDC) interface is available with LEA-6 and NEO-6 modules for serial

communication. For more information about DDC implementation refer to the u-blox 6 Receiver Description

including Protocol Specification [3]. Background information about the DDC interface is available in Appendix

C.1.

u-blox 6 GPS receivers normally run in I

C slave mode. Master Mode is only supported when external

EEPROM is used to store configuration. No other nodes may be connected to the bus. In this case, the

receiver attempts to establish presence of such a non-volatile memory component by writing and reading

from a specific location.

Pins SDA2 and SCL2 have internal 13kOhm pull-ups. If capacitive bus load is very large, additional external pull-

ups may be needed in order to reduce the pull-up resistance.

Table 2 lists the maximum total pull-up resistor values for the DDC interface. For small loads, e.g. if just

connecting to an external EEPROM, these built-in pull-ups are sufficient.

Load Capacitance Pull-Up Resistor Value R20, R21

50 pF N/A

100 pF

18 kΩ

250 pF

4.7 kΩ

Table 2: Pull-up resistor values for DDC interface

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