DFR1103

DFR1103 is a Gravity: GNSS GPS BeiDou positioning module with RTC - I2C&UART. The module automatically obtains satellite time based on a preset calibration period and accurately calibrates the onboard RTC chip. This calibration effectively eliminates time errors caused by the RTC chip during extended operation or accidental situations. The system automatically cuts off power to the GNSS chip after calibration, significantly reducing overall system power consumption compared to GNSS-only solutions. Additionally, the user has the option to use the module as a positioning module by setting GNSS active all the time, providing accurate longitude, latitude, time, altitude, and other data. It is compatible with Arduino, ESP32, Raspberry Pi and other mainstream control devices. Ideal for scenarios requiring extended working hours and high-precision time, such as astronomical observation timers, NTP servers, and outdoor wireless sensor time synchronization.

• Integrated GNSS and RTC functionality
• Automatic satellite time calibration, RTC chip calibration, power efficiency
• Satellite signal loss mitigation
• Operating voltage range from 3.3 to 5VDC
• L76K GNSS IC, 2.0m CEP GNSS accuracy
• First positioning time: 30s (cold start), 2s (hot start)
• Operation current: GNSS enable: 46mA and GNSS chip off ＜1mA
• IPEX 1 antenna interface, 1561 to 1575.42MHz±3MHz antenna frequency
• SD3031 RTC IC, time range: year 2000 to 2099
• ±3.8ppm at 25°C time accuracy and PCB size: 32mm x 42mm

Contents

Gravity: GNSS positioning & timing module x1, GPS / BeiDou Active Ceramic Antenna (IPEX1 Connector), Gravity 4P sensor cable, 10 P connector.