Product specifications

23
The Event Marker input is active low 3.3 V HCMOS with falling edge
synchronization. The input impedance and capacitance is higher than 10 kΩ
and 10 pF respectively, with a threshold of lower than 0.7 V required to
recognize the input.
G ROUNDS
When connecting the four ground pins of the Crescent Vector module, all four
grounds may be connected together (these are not separate analog and
digital grounds that require separate attention).
M ISC . P INS
The ARM boot select pin should not be connected and is present for Factory
use only.
S HIELDING
Typically, the Crescent Vector does not require shielding for the sake of improving
immunity to RF noise incident upon the board and its various devices. You may,
however, wish to shield the Crescent Vector from the rest of the integration if you
find that it interferes with other devices or systems.
If you are designing a smart antenna based upon the Crescent Vector (the Crescent
Vector board and the two GPS antennas in close proximity), you will likely want to
shield the Crescent Vector so that it does not interfere with the incoming GPS signals
to the antenna.