u-blox NEO-8Q Series User Manual

NEO-8Q / NEO-M8 - Hardware Integration Manual
UBX-15029985 - R04 Production Information Hardware description
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The TX_READY functionality can be enabled and configured by AT commands sent to the u-blox cellular
module supporting the feature. For more information, see the GPS Implementation and Aiding Features in
u-blox wireless modules [8].
1.5 I/O pins
1.5.1 RESET_N: Reset
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. With NEO-8Q and
NEO-M8 series modules RESET_N is an input only.
The RTC time is also reset (but not BBR)
1.5.2 EXTINT: External interrupt
EXTINT (EXTINT0 on NEO-M8T) is an external interrupt pin with fixed input voltage thresholds with respect to
VCC (see the corresponding product data sheet in Related documents for more information). It can be used for
wake-up functions in Power Save Mode on NEO-8Q and NEO-M8 series modules and for aiding. Leave open if
unused. The function is disabled by default.
EXTINT1 is an external interrupt pin on NEO-M8T with fixed input voltage thresholds with respect to VCC (see
the corresponding product data sheet in Related documents for more information). It can be used for wake-up
functions in Power Save Mode on NEO-M8T module and for aiding. Leave open if unused. The function is
disabled by default.
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 (EXTINT0 on NEO-M8T) pin. The receiver can also be forced
OFF using EXTINT (EXTINT0 on NEO-M8T) when Power Save Mode is not active.
Frequency aiding
The EXTINT (EXTINT0 on NEO-M8T) 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 (EXTINT0 on NEO-M8T) 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 (EXTINT0
on NEO-M8T) 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.
On the NEO-M8T module, a configurable TIMEPULSE2 signal can be programmed on TP2/SAFEBOOT_N.
Do not pull low during reset
1.5.4 D_SEL: Interface select
The D_SEL pin selects the available interfaces. SPI cannot be used simultaneously with UART/DDC. If open, UART
and DDC are available. If pulled low, the SPI interface is available. See the corresponding product data sheet in
the Related documents.
1.5.5 TIMEPULSE (TIMEPULSE1 on NEO-M8T)
On NEO-8Q and NEO-M8 series modules, a configurable time pulse signal is available. By default, the time pulse
signal is configured to one pulse per second. For more information, see the u-blox 8 / u-blox M8 Receiver

u-blox NEO-8Q Series Specifications

General

Brand	u-blox
Model	NEO-8Q Series
Category	Control Unit
Language	English