ZED-F9P - Integration Manual
UBX-18010802 - R01
2 Hardware description
Page 28 of 64
Objective Specification - Confidential
2 Hardware description
2.1 Block diagram
Figure 28: ZED-F9P block diagram
2.2 Connecting Power
The u-blox ZED-F9P modules have two power supply pins: VCC, V_BCKP.
2.2.1 VCC: Main supply voltage
The
VCC
pin provides the main supply voltage. During operation, the current drawn by the module
can vary by some orders of magnitude. For this reason, it is important that the supply circuitry be
able to support the peak power for a short time (see the u-blox u-blox ZED-F9P Data sheet [
] for
specification).
When switching from backup mode to normal operation or at start-up, u-blox ZED-F9P
modules must charge the internal capacitors in the core domain. In certain situations, this
can result in a significant current draw. At least 300 mA with no drop in VCC voltage must be
supported just for the module. For low power applications using backup mode, it is important
that the power supply or low ESR capacitors at the module input can deliver this current/
charge.
Do not use any resistors or coils in the power line.
Do not add any series resistance greater than 0.2
Ω
to the VCC supply as it will generate input
voltage noise due to the dynamic current conditions.
