ZED-F9K-Integration manual
Real-time clock (RTC)
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-F9K power supply
The ZED-F9K 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 32: ZED-F9K power supply
4.3 ZED-F9K minimal design
The minimal electrical circuit for ZED-F9K operation using the UART1 interface is shown in Figure
33 below.
UBX-20046189 - R01
4 Design Page 75 of 105
C1-Public Early production information
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