MAX-8 / MAX-M8 - Hardware Integration Manual
UBX-15030059 - R05 Hardware description Page 8 of 31
Production Information
1.5.1 RESET_N: Reset input
Driving RESET_N low activates a hardware reset of the system. Use this pin only to reset the module.
Do not use RESET_N to turn the module on and off, since the reset state increases power
consumption. In u-blox MAX-8 / MAX-M8 modules, RESET_N is an input only.
1.5.2 EXTINT: External interrupt
EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC_IO (see
the
MAX-8 Data Sheet
[1] and
MAX-M8 Data Sheet
[2] for more information). It can be used for wake-
up functions in Power Save Mode on all u-blox 8 / M8 modules and for aiding. Leave open if unused;
the functions are disabled by default.
If the EXTINT is not used for an external interrupt function, it can be used for some other purpose, e.g.
as an output pin for the TX_READY feature to indicate that the receiver has data to transmit.
Power Control
The power control feature allows overriding the automatic active/inactive cycle of Power Save Mode.
The state of the receiver can be controlled through the EXTINT pin. The receiver can also be forced
OFF using EXTINT when Power Save Mode is not active.
Frequency aiding
The EXTINT pin can be used to supply time or frequency aiding data to the receiver.
For time aiding, hardware time synchronization can be achieved by connecting an accurate time pulse
to the EXTINT pin.
Frequency aiding can be implemented by connecting a periodic rectangular signal with a frequency up
to 500 kHz and arbitrary duty cycle (low/high phase duration must not be shorter than 50 ns) to the
EXTINT pin. Provide the applied frequency value to the receiver using UBX messages.
1.5.3 SAFEBOOT_N
The SAFEBOOT_N pin is for future service, updates and reconfiguration.
1.5.4 TIMEPULSE
A configurable time pulse signal is available with all u-blox 8 / u-blox M8 modules. By default, the time
pulse signal is configured to 1 pulse per second. For more information, see the
u-blox 8 /
u-blox M8
Receiver Description Including Protocol Specification
[3].
1.5.5 LNA_EN: LNA enable
On MAX-M8Q, MAX-M8C, MAX-8C and MAX-8Q modules, in Power Save Mode, the system can turn
on/off an optional external LNA using the LNA_EN signal in order to optimize power consumption.
Signals: "high" = Turn ON LNA, "low" = Turn OFF LNA
Antenna Short circuit detection (ANT_OK) (MAX-M8W)
MAX-M8W module includes internal short circuit antenna detection. For more information, see
section 2.4.5.
"high" = antenna is ok (e.g. no short); "low" = antenna not ok (e.g. short)
Antenna supervision is configurable using message UBX-CFG-ANT.
☞ Refer to the
u-blox 8 /
u-blox M8 Receiver Description Including Protocol Specification
[3] for
information about further settings.
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