STMicroelectronics TESEO-LIV3R

Overview

TESEO-LIV3R from STMicroelectronics is a certified, standalone GNSS module embedding the Teseo III single-die receiver IC for simultaneous GPS/Glonass/BeiDou/QZSS positioning. It delivers 1.5 m CEP accuracy, -163 dBm tracking sensitivity, and 2.1–4.3 V supply operation in a 9.7×10.1 mm LCC-18 package, enabling compact, low-power location solutions for asset tracking and emergency telematics.

For engineers reviewing the TESEO-LIV3R datasheet, TESEO-LIV3R pinout, TESEO-LIV3R application, or TESEO-LIV3R equivalent, key selection criteria include multi-constellation TTFF performance (<2.5 s warm start), RTC-assisted low-power standby (17 µW), integrated TCXO timing stability, and NMEA-compatible UART/I²C host interface support.

Technical Context

The TESEO-LIV3R implements a fully integrated GNSS front-end with dedicated 26 MHz TCXO for RF down-conversion and a separate 32.768 kHz RTC oscillator for timekeeping and wake-up control. Its firmware supports real-time assisted GNSS (RT-AGNSS) via host-injected ephemeris data using proprietary NMEA commands.

It operates in three power modes: active tracking (70 mW), hardware standby (<6 µA with VBAT only), and software standby (<12 µA with VCC_RF active). Geofencing (≥8 circular zones) and odometer functions are executed autonomously within the module firmware without host intervention.

Key Specifications

Pinout & Package

Tiny LCC-18 surface-mount package (9.7 mm × 10.1 mm, 1.1 mm height), RoHS-compliant, moisture sensitivity level 3, reflow-compatible per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standalone GNSS module applications.

Compared with NEO-M8N and L86, TESEO-LIV3R uniquely integrates RTC backup, TCXO, and autonomous firmware features (geofence/odometer) in a single certified module - reducing BOM count and host processing load for cost-sensitive, battery-powered IoT trackers.

Availability

TESEO-LIV3R is available at Aetrix Electronics and suitable for insurance telematics, drone navigation, emergency call systems, and fleet management terminals requiring stable component supply, full regulatory certification (CE/RED), and long-term production continuity.

Supply support for TESEO-LIV3R 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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and wireless solutions for automotive, industrial, and IoT markets.

The Teseo product line delivers certified, easy-to-integrate GNSS modules optimized for rapid time-to-market in battery-constrained, safety-critical, and regulatory-compliant location applications - emphasizing firmware autonomy, low power, and multi-constellation robustness.

FAQ

Does TESEO-LIV3R require an external crystal or TCXO?

No. TESEO-LIV3R integrates a 26 MHz temperature-compensated crystal oscillator (TCXO) and a dedicated 32.768 kHz RTC oscillator. These eliminate external timing components, reduce PCB area, and improve phase noise performance for faster TTFF and better weak-signal tracking - confirmed in Section 5 of DS12821 Rev 3.

How is Real-Time Assisted GNSS (RT-AGNSS) implemented?

RT-AGNSS uses proprietary NMEA commands ($PSTMAGNSSSTART, $PSTMAGNSSSTOP) to inject ephemeris data from a host MCU that retrieves it from ST's free cloud server. The module processes assistance data internally - no host-side GNSS algorithm is needed. Server credentials are embedded in firmware; implementation details are in Section 4.1 of the datasheet.

What is the function of the Ant_OFF pin?

Pin 13 (Ant_OFF) is an active-high output that disables bias voltage to external active antennas during standby modes. When asserted, it prevents unnecessary current draw from the antenna's LNA - critical for maintaining sub-12 µW software standby current. The pin is driven only during defined low-power states, per Section 8.2.

Can TESEO-LIV3R operate without Vbatt connected?

Yes, but with functional trade-offs: Vbatt powers the RTC backup domain. Without it, the module loses timekeeping during power cycles, resets almanac/ephemeris data, and cannot perform hardware standby (<6 µA). Warm starts become cold starts, increasing TTFF to >32 s. Vbatt is mandatory for applications requiring persistent time and fast reacquisition.