EVA-M8E - Hardware Integration Manual
UBX-15028542 - R05
Contents
Page 13 of 44
Production Information
2.3.1
Time pulse
A configurable time pulse signal is available with the u-blox EVA-M8E module.
The
TIMEPULSE
output generates pulse trains synchronized with GPS or UTC time grid with intervals
configurable over a wide frequency range. Thus it may be used as a low frequency time
synchronization pulse or as a high frequency reference signal.
By default the time pulse signal is disabled. For more information see the
u-blox 8 / u-blox M8 Receiver
Description including Protocol Specification
[2].
☞
The EVA-M8E TIMEPULSE output is configured using TIMEPULSE2 messages.
2.3.2
External interrupt
Pin
PIO14/ANT_DET
can be used as an optional external interrupt pin with fixed input voltage
thresholds with respect to
VCC_IO
(see the EVA-M8E Data Sheet [1] for more information).It can be
used for force-OFF the receiver or aiding.. By default, the external interrupt is disabled.
☞
The EVA-M8E
EXTINT
pin is called
EXTINT1
in the u-blox 8 / u-blox M8 Receiver Description
Protocol Specification [2].
☞
If the
PIO14/ANT_DET
pin is configured for on/off switching of the module, the internal pull-up
becomes disabled. Thus make sure the input is always driven within the defined voltage level by
the host
For further information, see the u-blox 8 / u-blox M8 Receiver Description Protocol Specification [2].
2.3.3
Active antenna supervisor
The EVA-M8E module supports active antenna supervisors. The antenna supervisor gives
information about the status of the active antenna and will turn off the supply to the active antenna
in case a short is detected or to optimize the power consumption when in Power Save Mode.
There is either a 2-pin or a 3-pin antenna supervisor. By default, the 2-pin antenna supervisor is
enabled.
2.3.3.1
2-pin antenna supervisor
The 2-pin antenna supervisor function, which is enabled by default, consists of the
ANT_OK
input and
the
ANT_OFF
output pins.
Function
I/O
Description
Remarks
ANT_OK
I
Antenna OK
“high” = Antenna OK
“low” = Antenna not OK
Default configuration
ANT_OFF
O
Control signal to turn on and off the antenna supply
“high” = Antenna OFF
“low” = Antenna ON
Default configuration
Table 3: 2-pin antenna supervisor pins
The circuitry, as shown in Appendix A.7 (see Figure 20) provides antenna supply short circuit
detection. It will prevent antenna operation via transistor T1 if a short circuit has been detected or if
it is not required (e.g. in Power Save Mode).
The status of the active antenna can be checked by the UBX-MON-HW message. More information
see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification [2].
