STMicroelectronics AEK-COM-GNSST31

Overview

AEK-COM-GNSST31 from STMicroelectronics is an automotive-grade GNSS evaluation board built around the Teseo-LIV3F module, integrating a TeseoIII standalone positioning receiver IC, 26 MHz TCXO, and 32 kHz RTC oscillator. It delivers -162 dBm tracking sensitivity, supports UART/I²C interfaces, configurable timepulse output, and EXTINT wakeup, enabling rapid development of high-accuracy location services for SPC5-based automotive systems.

For engineers reviewing the AEK-COM-GNSST31 datasheet, AEK-COM-GNSST31 pinout, AEK-COM-GNSST31 application, or AEK-COM-GNSST31 equivalent, key selection considerations include its AutoDevKit™ integration with SPC5-STUDIO, X-CUBE-GNSS1 firmware compatibility, SMA antenna interface, battery-backed RTC support, and industrial temperature range (-40/+85 °C) operation.

Technical Context

The board implements a complete GNSS signal acquisition and navigation stack via the embedded TeseoIII receiver, leveraging predictive autonomous and server-based assisted GNSS (A-GNSS) modes to reduce TTFF. Its RF path includes integrated LNA and SAW filter, and timing stability is ensured by the on-board TCXO and dedicated RTC oscillator.

Interface translation is handled by dual TXB0101 level shifters (UART and I²C), while wakeup and reset control are managed through dedicated GPIOs (SYS_WAKEUP, SYS_RESETn). Power is conditioned via LDS3985PU33R (3.3 V) and discrete 5 V regulation, supporting dual supply inputs (3.3–5 V).

Key Specifications

Availability

AEK-COM-GNSST31 is available at Aetrix Electronics and suitable for automotive ADAS prototyping, smart city asset tracking, and GNSS-enabled mobility service development requiring stable component supply, long-term lifecycle support, and validated firmware integration.

Supply support for AEK-COM-GNSST31 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, sensors, power management, and automotive-grade ICs, with deep expertise in embedded positioning and automotive electronics.

AEK-COM-GNSST31 belongs to the AutoDevKit™ initiative - a modular, SPC5-focused ecosystem designed to accelerate automotive software-defined development, from GNSS sensor fusion to functional safety-aware application deployment.

FAQ

Does AEK-COM-GNSST31 require external memory to run X-CUBE-GNSS1 firmware?

No. The evaluation board operates X-CUBE-GNSS1 firmware directly from internal flash resources of the Teseo-LIV3F module. No external memory (e.g., SPI Flash or SD card) is needed for basic acquisition, tracking, navigation, and NMEA output functionality as specified in DB4131 Rev 1.

What is the role of the 32 kHz RTC oscillator on AEK-COM-GNSST31?

The 32 kHz RTC oscillator provides battery-backed timekeeping independent of main power, enabling fast cold/warm start modes and maintaining time during host MCU sleep. It directly supports Teseo-LIV3F's power-efficient tracking and A-GNSS prediction scheduling without host intervention.

Can AEK-COM-GNSST31 be used without an SPC5 microcontroller?

Yes. While optimized for SPC5 integration via AutoDevKit™ headers and SPC5-STUDIO, the board functions autonomously: UART/I²C outputs NMEA sentences directly to any host (e.g., STM32, Raspberry Pi, or PC) using standard 3.3 V logic levels and configurable baud rates up to 115200 bps.

Is the SMA antenna connector internally matched for 50 Ω operation?

Yes. The RF path includes a BGA824N6 LNA, 56 nH/6.8 nH matching network, and ESD protection (ESDARF02-1BU2CK), with impedance verified to 50 Ω at GNSS bands (1.164–1.610 GHz). The SMA interface is designed for direct connection to certified active GNSS antennas without external matching components.