LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
GPS.G5-MS5-09027-A2
Released
Hardware description
Page 11 of 68
1.3.2.2
Eco mode
In Eco mode, u-blox 5 receivers use the acquisition engine to search for new satellites
only when needed
for
navigation:
In cold starts, u-blox 5 searches for enough satellites to navigate and optimizes use of the acquisition
engine to download their ephemeris.
In non-cold starts, u-blox 5 focuses on searching for visible satellites whose orbits are known from the
Almanac.
In Eco mode, the u-blox 5 acquisition engine limits use of its searching resources to minimize power
consumption. As a consequence the time to find some satellites at weakest signal level might be slightly
increased in comparison to the Maximum Performance mode.
u-blox 5 deactivates the acquisition engine as soon as a position is fixed and a sufficient number (at least 4) of
satellites are being tracked. The tracking engine continues to search and track new satellites without orbit
information.
1.3.2.3
Power Save mode (new with FW 6.00)
u-blox 5 modules include power saving options that allow reducing the average tracking current consumption by
periodically switching off parts of or the complete GPS receiver and waking it up at configurable intervals from
one second to one week. This can be done by using a hardware interrupt or by sending a serial command. The
firmware also offers the option to reduce the peak and acquisition current independently of the power down
option.
1.3.3
V_ANT (LEA-5H/5S/5A, TIM-5H)
TIM-5H and LEA-5 modules supporting active antenna supply and supervision use the pin
V_ANT
to supply the
active antenna. Use a 10R resistor in front of
V_ANT
2
. See chapter 2.6.
1.4
System functions
1.4.1
EXTINT - –xternal interrupt pin
EXTINT0
is an external interrupt pin used for the time mark function on LEA-5T. With FW 6.0, it can be used for
wake-up functions in low-power modes.
1.4.2
System monitoring
The u-blox
-
5 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 5 Receiver Description including Protocol Specification [2]
For more information on
UBX messages, serial interfaces for design analysis and individual system monitoring functions.
1.5
Interfaces
1.5.1
UART
u-blox 5 modules include up to 2 Universal Asynchronous Receiver Transmitter (UART) serial interfaces. UART 1
(
RxD1
/
TxD1
) is the default. It supports data rates from 4.8 to 230.4 kBit/s. The signal output levels are 0 V to
2
Only applies to modules supporting active antenna supply and supervision.
