ZED-F9P - Integration manual
The real-time clock (RTC) is driven by a 32-kHz oscillator using an RTC crystal. If VCC is removed
whilst a battery is connected to
V_BCKP
, most of the receiver is switched off leaving the RTC and
BBR powered. This operating mode is called Hardware Backup Mode which enables time keeping and
all relevant data to be saved to allow a hot or warm start.
4.2.3 ZED-F9P power supply
The ZED-F9P high precision receiver requires a low-noise, low-dropout voltage, and a very low source
impedance power supply of 3.3 V typically. No inductors or ferrite beads should be used from LDO
to the module VCC pin. The peak currents need to be taken into account for the source supplying
the LDO for the module.
A power supply fed by 5 V is shown in the figure below. This example circuit is intended only for the
module supply.
Figure 35: ZED-F9P power supply
4.3 ZED-F9P minimal design
The minimal electrical circuit for ZED-F9P operation using the UART1 interface is shown in
below.
UBX-18010802 - R08
4 Design
Page 74 of 110
Early production information
