The 7Semi LG77L Multi-Constellation GNSS Breakout is a compact satellite positioning module designed for navigation, location tracking, asset monitoring, and embedded GNSS applications. Built around the Quectel LG77L GNSS receiver, it supports multiple satellite navigation systems for improved satellite availability and positioning performance in challenging environments.
The module provides UART communication with a default baud rate of 9600 bps, configurable up to 921600 bps, and supports positioning updates up to 10Hz. It offers NMEA 0183 output, PMTK and PQ command support, SBAS augmentation, and EASY-assisted positioning to help reduce time to first fix.
The breakout operates from a 3.3V supply and features a dedicated external antenna connector, an onboard backup cell for retaining GNSS backup information, a power indicator, and clearly labeled 3V3, GND, TX, and RX connections. Its compact 22 × 12mm PCB makes it suitable for robotics, portable navigation devices, asset trackers, IoT systems, and space-constrained embedded applications.
Key Features
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Multi-Constellation GNSS: Supports multiple satellite navigation systems, including GPS, GLONASS, BeiDou, and QZSS.
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Improved Position Availability: Uses supported GNSS constellation combinations to increase satellite availability and improve positioning reliability.
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High Tracking Sensitivity: Provides tracking sensitivity down to −163 dBm.
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Fast Position Updates: Supports configurable GNSS positioning update rates up to 10Hz.
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UART Communication: Features a default baud rate of 9600 bps, with supported speeds up to 921600 bps.
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GNSS Protocol Support: Supports NMEA 0183, PMTK, and PQ communication protocols.
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SBAS Augmentation: Supports WAAS, EGNOS, MSAS, and GAGAN for compatible satellite-based augmentation.
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EASY-Assisted Positioning: Uses stored satellite orbit information to help reduce time to first fix.
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Low-Power Operation: Supports GNSS power-saving features for energy-efficient tracking applications.
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External Antenna Connector: Provides a dedicated RF connector for connecting a compatible GNSS antenna.
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Onboard Backup Cell: Helps retain GNSS backup information between main power cycles.
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Compact Breakout Design: Features a 22 × 12mm PCB with four clearly labeled connections: 3V3, GND, TX, and RX.
Product Includes
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1 × 7Semi LG77L Multi-Constellation GNSS Breakout Board
Note: External GNSS antenna is not included. A compatible GNSS antenna with a U.FL connector is required for satellite signal reception.
- _resources_step_file:
- https://7semi.com/content/3d-files/dfx_step/10505.STEP
- _resources_dxf_file:
- https://7semi.com/content/3d-files/dfx_step/10505.STEP
- Category of product:
- GNSS Receiver Module
- GNSS Receiver:
- Quectel LG77L series
- Communication Interface:
- UART
- UART Baud Rate:
- 9600–921600 bps (supported discrete rates)
- Default Baud Rate:
- 9600 bps
- Position Update Rate:
- 1Hz default, up to 10Hz
- Supported GNSS:
- GPS, GLONASS, Galileo, BeiDou, QZSS
- Tracking Sensitivity:
- −163 dBm
- _resources_dataheet:
- https://7semi.com/content/datasheets/Quectel_LG77LC_GNSS_Specification_V1.5.pdf
- _summary:
- 7Semi LG77LC GNSS breakout supports GPS, GLONASS, Galileo, BeiDou and QZSS with UART communication, 10Hz updates and external antenna connectivity.
- _resources_driver_installation_guide:
- https://store-e7ighpotvb.mybigcommerce.com/manage/microapps/ng-add-edit-products/edit/%%GLOBAL_ShopPathSSL%%/content/datasheets/Quectel_Windows_USB_Driver%28A%29_Installation_Guide_V1.1.pdf
- _3d_glb:
- https://7semi.com/content/3d-files/10505.glb
- Horizontal Position Accuracy:
- Better than 2.5m CEP
- GNSS Protocols:
- NMEA 0183, PMTK, PQ
- SBAS Support:
- WAAS, EGNOS, MSAS, GAGAN
- Antenna Connection:
- U.FL-style RF connector
- Backup Supply:
- Onboard backup cell
- Breakout Pinout:
- 3V3, GND, TX, RX
- Operating Temperature:
- −40 C to +85 C
- Approximate Dimensions (L × W × H):
- Approximately 22 × 12 x 3.6 mm
