AT6558R positioning module

AT6558R is a high-performance BDS/GNSS multi-mode satellite navigation receiver SOC single chip, which integrates on-chip RF front-end, digital baseband processor, 32-bit RISC CPU, and power management functions. The chip supports a variety of satellite navigation systems, including China's Beidou Satellite Navigation System BDS, the United States' GPS, and Russia's GLONASS, and achieves joint positioning of multiple systems.

2 Main features  Functional specifications  Supports BDS/GPS/GLONASS multi-system joint positioning and single-system independent positioning.  Sensitivity Cold start capture sensitivity: -148dBm.  Tracking sensitivity: -162dBm.  Power management  Supports 2.7~3.6V single power supply, typical 3.3V power supply.  RTC and backup circuit power supply can be as low as 1.4V.  BDS/GPS dual-mode continuous operation: <23mA (@3.3V).  Standby: 8uA (@3.3V)  Antenna detection and protection  Supports active antenna detection.  Supports active antenna short circuit protection.

The chip integrates an active antenna detection circuit and can feed an external active antenna. And according to the size of the feed current, it indicates the status of the active antenna. The active antenna detection circuit also provides short circuit protection to protect the chip and active antenna from damage by limiting the current fed to the active antenna. The detection circuit defines three states. When the current is less than the set value, it indicates that the antenna is open circuit; when the current is greater than the set value, it indicates that the antenna is normal; when the current is too large or a short circuit occurs, it indicates that the antenna is overcurrent. 5 Baseband processor 5.1 multi-system satellite processing engine chip integrates the latest multi-system satellite processing engine, supports BDS, GPS, GLONASS system signals, and achieves joint positioning, which can significantly improve positioning accuracy and positioning availability, especially in cities In complex environments such as canyons, the performance improvement is more significant. 5.2 Real-time clock backup area The real-time clock (RTC) is located in the battery-powered area and is equipped with a backup RAM. Use an independent low-power LDO for power supply. RTC can work normally when the main power supply disappears, while ensuring that the data in the backup RAM is not lost.

UART contains two independent full-duplex UART modules to realize data conversion between serial and parallel. The baud rate supports a maximum of 256000bps and has automatic baud rate detection function.

The chip has two methods for mode configuration. 1) By sending commands through UART, the system mode can be switched to a combination of BDS/GPS/GLONASS, such as BDS+GPS dual mode, or GPS+GLONASS dual mode, or GPS single mode, etc. 2) Set through GPIO8. When GPIO8 is left floating or high, the chip works in the BDS+GPS dual-mode state. When GPIO8 is low level, the chip works in GPS+GLONASS dual-mode state.