ZED-F9R-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
while 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-F9R power supply
The ZED-F9R 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-F9R power supply
4.3 ZED-F9R minimal design
The minimal electrical circuit for ZED-F9R operation using the UART1 interface is shown in Figure
36 below.
UBX-20039643 - R06
4 Design Page 89 of 119
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