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LEA-6 - Data Sheet

GPS.G6-HW-09004-E2 Page 9 of 26

1.10.3 SPI (LEA-6R)

LEA-6R includes a Serial Peripheral Interface (SPI) for connecting external sensors. The interface can be operated

in SPI master mode only. Two chip select signals are available to select external slaves.

LEA-6R default SPI clock is 870 kHz. As LEA-4R default value is 460 kHz, migrating from LEA-4R to LEA-6R will

require a bandwidth verification of the SPI circuits.

1.10.4 Display Data Channel (DDC)

The I

C compatible DDC interface can be used either to access external devices with a serial interface or to

interface with a host CPU. It is capable of master and slave operation. DDC is not available with LEA-6R. The

DDC interface is I

C Standard Mode compliant. For timing parameters consult the I

C standard.

The DDC Interface supports serial communication with u-blox wireless modules. See the specification of

the applicable wireless module to confirm compatibility.

The maximum bandwidth is 100kbit/s.

1.10.4.1 External serial EEPROM

LEA-6A and LEA-6S modules allow an optional external serial EEPROM to be connected to the DDC interface.

This can be used to store Configurations permanently.

For more information see the LEA-6/NEO-6/MAX-6 Hardware Integration Manual [1].

1.11 Antenna

LEA-6 modules are designed for use with passive and active antennas.

An antenna supervisor is available with all LEA-6 Modules. In the default operation mode the antenna supervisor

is activated and enables the receiver to detect short circuits at the active antenna by checking the bias voltage

level and can shut down the voltage bias immediately. A series resistor is needed in front of the V_ANT input.

UBX and NMEA messages are provided to report the condition of the antenna supply. Open circuit detection can

also be supported with an additional external circuit. For details, please refer to the LEA-6/NEO-6/MAX-6

Hardware Integration Manual [1].

Parameter Specification

Antenna Type Passive and active antenna

Active Antenna Recommendations

Minimum gain

Maximum gain

Maximum noise figure

15 dB (to compensate signal loss in RF cable)

50 dB

1.5 dB

Table 5: Antenna specifications

1.11.1 Power Management

u-blox receivers support different power modes. These modes represent strategies of how to control the

acquisition and tracking engines in order to achieve either the best possible performance or good performance

with reduced power consumption.

For more information about power management strategies, see the u-blox 6 Receiver Description

including Protocol Specification [2].

1.11.2 Maximum Performance Mode

During a Cold start, a receiver in Maximum Performance Mode continuously deploys the acquisition engine to

search for all satellites. Once the receiver has a position fix (or if pre-positioning information is available), the

acquisition engine continues to be used to search for all visible satellites that are not being tracked.