L76K GNSS Module for XIAO

Features / Specs

• Manufacturer: Seeed Studio
• Part Number: 109100021
• Main Module: Quectel L76K (Multi-GNSS Receiver)
• Antenna Connection: Male IPEX MHF-I / U.FL Socket (Hirose U.FL-R-SMT-1), powers an active antenna at 3.3 V, 50 mA max
• Included Antenna:
  • Type: Active ceramic GNSS antenna
  • Operating Frequency Range: 1559 – 1606 MHz
  • Cable: RF1.13 coaxial, 100 mm ±8 mm, IPEX MHF-I / U.FL right-angle plug
  • Dimensions (L x W x H): (25 x 25) x 8.5 mm (L / W ±2 mm, H ±1 mm)
  • Mounting: Double-sided adhesive pad on the back (3M 9080A)
• Operating Voltage Range (Module): 2.7 – 3.4 V (supplied at 3.3 V from the XIAO’s 3V3 pin)
• Current Consumption (with Active Antenna):
  • Acquisition: 41 mA
  • Tracking: 41 mA
  • Standby: 360 μA
• Communication Interface: UART – XIAO D6 (TX, to the module) / D7 (RX, from the module)
• UART Baud Rate Range: 9600 – 115200 bps (9600 bps default)
• Output Protocols: NMEA 0183 / CASIC proprietary protocol
• GNSS Systems: GPS / BeiDou / GLONASS / QZSS, with AGNSS support – GPS + BeiDou by default, GLONASS enabled by command, QZSS always on
• Frequency Bands:
  • GPS L1 C/A: 1575.42 MHz
  • GLONASS L1: 1602 MHz
  • BeiDou B1: 1561.098 MHz
• Channels: 32 tracking / 72 acquisition
• Sensitivity:
  • Auto-Acquisition: -148 dBm
  • Tracking: -162 dBm
  • Re-Acquisition: -160 dBm
• Time to First Fix (TTFF):
  • Cold Start: 30 s (without AGNSS) / 5.5 s (with AGNSS)
  • Hot Start: 2 s
• Accuracy:
  • Position: 2.0 m CEP
  • Velocity: 0.1 m/s
  • Acceleration: 0.1 m/s²
  • Timing: 30 ns
• Update Rate: 1 Hz (default) / 2 Hz / 5 Hz (max) – above 1 Hz, Quectel requires single-sentence NMEA output and 115200 bps
• RF Front End: Built-in low-noise amplifier (LNA) and surface acoustic wave (SAW) filter
• Control Pins:
  • Wake-Up: XIAO D0 – low = sleep, high = normal operation
  • Reset: XIAO D2 – low = reset, high = normal operation
• RTC Backup: Pads on the back for an optional rechargeable cell (not fitted – Seeed recommends a Seiko MS621FE), used only to keep the real-time clock running for faster starts – it cannot power the XIAO
• LEDs: None – Seeed removed the green 1PPS fix LED in a May 2025 product change; the product photos show the earlier V1.0 board, which still has it
• Host Board Compatibility: Seeed Studio XIAO series – Seeed lists the XIAO SAMD21 / XIAO RP2040 / XIAO nRF52840 (Sense) / XIAO ESP32-C3 / XIAO ESP32-S3 (Sense)
• Stacking with the Wio-SX1262 for XIAO: Both boards use D0 (this board’s wake-up, the Wio-SX1262 board’s user button) and D2 (reset on both) – holding the button puts the GNSS module to sleep, and a radio reset also resets it
• Meshtastic Firmware: Supported as the GNSS module in Meshtastic’s stock firmware on the XIAO nRF52840 (“Seeed Xiao NRF52840 Kit” target), which uses D0 for the module’s wake-up pin and so leaves that firmware’s user button off
• Operating Temperature Range (Module): -40 °C to +85 °C
• Storage Temperature Range (Module): -40 °C to +90 °C
• Dimensions (L x W x H): (21 x 18) x ~3.1 mm (L / W ±1.5 mm) – without the header sockets fitted
• Number of Pins: 2x 7 pins (14 total)
• Header Type: None fitted – castellated pads, with two 7-pin female header sockets included to solder on so a XIAO plugs in on top; or solder the board directly
• Header Pin Pitch: 2.54 mm

Resources

• Getting Started with L76K GNSS Module for Seeed Studio XIAO (Seeed Studio Wiki)
• Seeed Studio L76K GNSS Module for XIAO Product Datasheet
• Seeed Studio L76K GNSS Module for XIAO Schematic V1.0 – for the earlier V1.0 board (reset on D10, green LED fitted)
• Quectel L76K Product Spec v1.6 – Translated

Pin Description