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Beidou+GPS navigation and positioning chip

The AT6558 series is a high-performance BDS/GNSS multi-mode satellite navigation receiver SOC single-chip, with on-chip integrated RF front-end, digital baseband processor, built-in low-power 32-bit RISC MCU and other functions. The AT6558 series chip supports multiple satellite navigation systems, including China's Beidou Navigation Satellite System (BDS), the United States' GPS, Russia's GLONASS, the European Union's GALILEO, Japan's QZSS, and the Satellite Augmentation System (SBAS). It can simultaneously receive GNSS signals from six satellite navigation systems and achieve rapid joint positioning, navigation, and timing of multiple systems.

Main features

➢ Support BDS/GPS/GLONASS/QZSS multi system joint positioning and single system independent positioning

➢ Support all in orbit satellites of Beidou-2/3-1-63

➢ Equipped with active antenna short circuit detection and protection function

Internally integrated DCDC and LDO; Supports 3.3V single power supply (using internal DCDC), supports direct power supply from 1.8V~3.3V single power supply (not using internal DCDC)

RTC and backup circuit power supply can be as low as 1.4V

➢ Power consumption: BDS/GPS dual-mode continuous operation:~ 23mA@3.3V Standby mode: 8uA (@ 3.3V)

➢ Packaging: QFN40-5 * 5

performance metrics

Technical Specifications	indicator
signal reception	BDS/GPS/ GLONASS/QZSS
Cold start TTFF	≤32s
Hot start TTFF	≤1s
Re capture TTFF	≤1s
Cold start capture sensitivity	-148dBm
Hot start capture sensitivity	-156dBm
Re capture sensitivity	-160dBm
Tracking sensitivity	-162dBm
positioning accuracy	<2.5m（CEP50）
speed measurement accuracy	<0.1m/s（1σ）
Positioning update rate	1Hz

Design application diagram

1665916685402712

working mode

The AT6558 has multiple working modes: full working mode, automatic low-power mode, external control low-power mode, and battery backup mode.

1) Full working mode: When all power sources are supplying power normally and the ON-OFF pin is at a high level, the chip is in full working mode for normal signal reception and resolution.

2) Automatic low-power mode: In some application scenarios, continuous positioning is not necessary, and more emphasis is placed on low power consumption. In this case, the chip needs to turn off some functions in a timely manner to save power. In this mode, all power sources are supplying power normally. Once the chip is working properly and positioned, the internal program will automatically shut down the power consuming module, enter a low-power state, and start the timer (RTC timer). The timer will automatically wake up the chip and perform the next positioning。

Note: The automatic low-power mode requires program customization.

(3) External control low power mode: After all power sources are supplying power normally and the chip is working properly, the external host will pull down the ON-OFF pin, and the internal program of the chip will automatically save the current circuit state and turn off the RF circuit and baseband circuit, entering a low power consumption state. When the ON-OFF pin is pulled high, the chip will automatically return to full working mode (equivalent to a hot start). 4) Battery backup mode: Turn off all power sources except VDD_BK, and the chip will enter backup mode. At this point, only a very small current is needed to maintain the RTC clock and backup RAM. After the power is restored, the navigation program can be recovered from the backup RAM for fast hot start.

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