Manual
Table Of Contents
- Title
- Contents
- 1 Integration manual structure
- 2 System description
- 3 Receiver functionality
- 3.1 Receiver configuration
- 3.1.1 Changing the receiver configuration
- 3.1.2 Default GNSS configuration
- 3.1.3 Default interface settings
- 3.1.4 Basic receiver configuration
- 3.1.5 Differential timing mode configuration
- 3.1.6 Legacy configuration interface compatibility
- 3.1.7 Navigation configuration
- 3.2 Geofencing
- 3.3 Logging
- 3.4 Communication interfaces
- 3.5 Predefined PIOs
- 3.6 Antenna supervisor
- 3.7 Multiple GNSS assistance (MGA)
- 3.8 Clocks and time
- 3.9 Timing functionality
- 3.10 Security
- 3.11 u-blox protocol feature descriptions
- 3.12 Forcing a receiver reset
- 3.13 Firmware upload
- 3.1 Receiver configuration
- 4 Design
- 5 Product handling
- Appendix
- Related documents
- Revision history
- Contact
ZED-F9T-Integration manual
Allow all I/O including UART and other interfaces to float or connect to a high impedance in
HW backup mode (V_BCKP supplied when VCC is removed). See the Interfaces section.
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-F9T power supply
The ZED-F9T 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 31: ZED-F9T power supply
4.3 ZED-F9T minimal design
The minimal electrical circuit for ZED-F9T operation using the UART1 interface is shown in Figure
32 below.
UBX-19005590 - R05
4 Design Page 64 of 87
C1-Public Early production information