LEA-6 / NEO-6 - Hardware Integration Manual
GPS.G6-HW-09007-A
Preliminary
Hardware description
Page 17 of 62
1.7
I/O pins
1.7.1
RESET_N
LEA-6 modules include a
RESET_N
pin. Driving
RESET_N
low activates a hardware reset of the system.
RESET_N
is only an input and will not reset external circuitry.
Use components with open drain output (i.e. with buffer or voltage supervisor
).
There is an internal pull up resistor of 3k3 to VCC inside the module that requires that the reset circuitry can
deliver enough current (e.g. 1mA).
Do not drive
RESET_N
high.
NEO-6 modules do not include a
RESET_N
pin. However, this functionality can be implemented for these
modules by connecting the NEO-6 pin 8 to pin 9 with a 3k3 resistor, instead of connecting them directly. Pin 8
can then be used as a
RESET_N
input with the same characteristics as LEA-6 modules.
1.7.2
EXTINT0
EXTINT0
is an external interrupt pin with fixed input voltage thresholds with respect to VCC (see the data sheet
for more information). Leave open if unused.
1.7.3
AADET_N (LEA-6)
AADET_N
is an input pin and is used to report whether an external circuit has detected an external antenna or
not. Low means the antenna has been detected. High means no external antenna has been detected.
See chapter 2.5.5 for an implementation example.
1.7.4
Configuration pins (LEA-6S/6A, NEO-6)
ROM-based modules provide up to 3 pins (
CFG_COM0, CFG_COM1
,
CFG_GPS0
) for boot-time configuration.
These become effective immediately after start-up. Once the module has started, the configuration settings can
be modified with UBX configuration messages. The modified settings remain effective until power-down or
reset. If these settings have been stored in battery-backup RAM, then the modified configuration will be
retained, as long as the backup battery supply is not interrupted.
The module data sheets indicate the meaning of the configuration pins when they are high (1) or low (0). This
does not mean that all pins must be pulled either high or low. In fact no configuration pins need to be pulled
high. All have internal pull ups and therefore default to the high (1) state when left open or connected to a high
impedance output. They should be left open unless there is a need to pull them low to alter the initial
configuration.
Some configuration pins are shared with other functions. During start-up, the module reads the state of the
configuration pins. Afterwards the other functions can be used.
The configuration pins of u-blox 6 use an internal pull-up resistor, which determines the default setting.
For more information about settings and messages see the module data sheet.
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