# SparkFun GNSS Flex pHAT - LG290P

**Type:** Product page · **SKU:** GPS-28929 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/sparkfun-gnss-flex-phat-lg290p-raspberry-pi-rtk-gnss-carrier-board.html ([markdown](https://core-electronics.com.au/sparkfun-gnss-flex-phat-lg290p-raspberry-pi-rtk-gnss-carrier-board.html.md))

The SparkFun LG290P GNSS Flex pHAT is a development platform for the SparkFun GNSS Flex system. Designed to interface with a Raspberry Pi or comparable...

## Pricing

- **Price:** $294.95 (inc GST) — $268.14 AUD, exc GST
- **Quantity discounts:** 5+ $260.09 (exc GST) · 25+ $254.73 (exc GST) · 100+ $244.00 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 17 and Aug 24.

## Description

The SparkFun LG290P GNSS Flex pHAT is a development platform for the SparkFun GNSS Flex system. Designed to interface with a Raspberry Pi or comparable single-board computers via a 40-pin header, it acts as a carrier board for the SparkPNT LG290P GNSS Flex Module. The GNSS Flex system employs a modular design based on two 2x10-pin, 2mm pitch headers, ensuring pin compatibility across boards for simplified upgrades and repairs.

The SparkPNT LG290P GNSS Flex Module has these headers that break out the UART (x4), I2C\*, SD card interfaces of the mosaic-X5 GNSS receiver, and the PPS and event signals. Meanwhile, on the SparkFun GNSS Flex pHAT, the headers are connected to the USB-C connector, µSD card slot, and 40-pin header. This kit also includes the extension header, standoffs, and screws necessary to mount a pHAT on top of a Raspberry Pi.

The SparkPNT GNSS Flex module features the Quectel LG290P GNSS receiver. The LG290P module is a quad-band, multi-constellation, high-precision, RTK GNSS receiver. The module can simultaneously receive signals from the L1, L2, L5, and L6/E6 frequency bands of the GPS, GLONASS, Galileo, BDS, QZSS, and NavIC GNSS constellations. In addition, the module supports SBAS augmentation systems (WASS, EGNOS, BDSBAS, MSAS, GAGAN, and SDCM), PPP services\* (BDS PPP-B2b, QZSS CLAS, MADOCA-PPP, and Galileo HAS), RTCM, and RTK corrections for precision navigation with a fast convergence time and reliable performance.

The built-in NIC anti-jamming unit provides professional-grade interference signal detection and elimination algorithms, effectively mitigating multiple narrow-band interference sources and significantly improving signal reception performance in complex electromagnetic environments. Additionally, the embedded algorithms ensure reliable positioning in complex scenarios such as urban environments and deep tree cover.

\* This feature is still under development. The LG290P module currently supports only the UART interfaces, and the corrections for some of the PPP services may not have been implemented yet.

### Features & Specs

**GNSS Flex pHAT:**

- 40-pin socket for Raspberry Pi header
- Two 2x20-pin, 2mm-pitch male headers for Flex modules
- Antenna bridge
    - U.FL connector
    - SMA connector
- µSD card socket
- Qwiic connector
- Indicator LEDs
    - PWR *(Red)*
    - PPS *(Yellow)*
    - RTK *(White)*
    - PVT *(Blue)*
- Twenty-four jumpers
    - Raspberry Pi GPIO isolation (x16)
    - LED power isolation (x4)
    - I2C pull-up resistors (x4)

**LG290P GNSS Flex Module:**

- Quectel LG290P GNSS receiver
    - Concurrent signal reception: 5 + QZSS
        - `L1`, `L2`, `L5`, `E6` frequency bands
    - GNSS Constellations:
        - GPS (USA)
        - GLONASS (Russia)
        - Galileo (EU)
        - BDS (China)
        - QZSS (Japan)
        - NavIC (India)
    - SBAS Systems:
        - WASS (USA)
        - SDCM (Russia)
        - EGNOS (EU)
        - BDSBAS (China)
        - MSAS (Japan)
        - GAGAN (India)
    - Built-in NIC anti-jamming unit
- Two 2x20-pin, 2mm-pitch male headers
    - Power
        - USB
        - 3.3V
        - Backup power
    - UART (x3)
    - I2C bus
    - PPS signal (x1)
    - LED indicators (x1)
    - Event indicators (x1)

- U.FL Connector:
    - GNSS Antenna *(Active, Multi-band)*
**LG290P General Features**

- High-precision GNSS module
- Electrical Characteristics:
    - Supply Voltage: 3.15–3.45V
    - Current Consumption:
        - Normal Operation:
            - 91mA (300.3mW) *(Acquisition)*
            - 91mA (300.3mW) *(Tracking)*
        - Power Saving Mode:
            - 12µA (39.6mW) *(Backup Mode)*
- GNSS Frequency Bands:
    - GPS: `L1 C/A`, `L1C`\*, `L5`, `L2C`
    - GLONASS: `L1`, `L2`
    - Galileo: `E1`, `E5a`, `E5b`, `E6`
    - BDS: `B1I`, `B1C`, `B2a`, `B2b`, `B2I`, `B3I`
    - QZSS: `L1 C/A`, `L1C`\*, `L5`, `L2C`
    - NavIC: `L5`
    - SBAS: `L1 C/A`
    - L-band PPP\*:
        - PPP: `B2b`
        - QZSS: `L6`
        - Galileo HAS: `E6`
- Tracking Channels: 1040
- Horizontal Position Accuracy:
    - Autonomous: 0.7m
    - RTK: 0.8cm + 1ppm
- Vertical Accuracy:
    - Autonomous: 2.5m
    - RTK: 1.5cm + 1ppm
- Velocity Accuracy Without Aid: 0.03m/s
- Accuracy of 1PPS Signal: 5ns (RMS)
- RTK Convergence Time: 5s
- Time to First Fix (without AGNSS):
    - Cold Start: 28s
    - Warm Start: 28s
    - Hot Start: 1.7s
- Sensitivity:
    - Acquisition: -146dBm
    - Tracking: -160dBm
    - Reacquisition: -155dBm
- Dynamic Performance:
    - Maximum Altitude: 10000m
    - Maximum Velocity: 490m/s
    - Maximum Acceleration: 4g
- Update Rate:
    - Default: 10Hz
    - Max: 20Hz
- Antenna Interface:
    - External active antenna
    - Power Supply: External or Internal
- Interfaces
    - UART (x3)
        - Baud Rate: 9600–3000000bps
        - Default: 460800bps
        - Protocol: `NMEA 0183`/`RTCM 3.x`
    - SPI\* (x1)
    - I2C\* (x1)
- Operating temperature: -40°C to +85°C
- Footprint: 12.2mm × 16mm × 2.6mm
- Weight: ~0.9g

`*`: Feature is still under development
### Documentation

- Design Files
    - GNSS Flex pHAT
        - [Schematic](https://core-electronics.com.au/attachments/localcontent/schematic_12693d7a6b3.pdf)
        - [KiCad Files](https://core-electronics.com.au/attachments/localcontent/kicad_files_68881d0064a.zip)
        - [Board Dimensions](https://core-electronics.com.au/attachments/localcontent/dimensions_241984f61f8.pdf)
        - [STEP File](https://docs.sparkfun.com/SparkFun_GNSS_Flex_System/SparkFun_GNSS_Flex_pHAT/assets/3d_model/cad_model.step)
    - LG290P Flex Module
        - [Schematic](https://core-electronics.com.au/attachments/localcontent/schematic_569022268e0.pdf)
        - [KiCad Files](https://core-electronics.com.au/attachments/localcontent/kicad_files_2053996d1bf.zip)
        - [Board Dimensions](https://core-electronics.com.au/attachments/localcontent/dimensions_4465792d172.pdf)
        - [STEP File](https://docs.sparkfun.com/SparkFun_GNSS_Flex_System/SparkPNT_GNSS_Flex_Module_LG290P/assets/3d_model/cad_model.step)
- [Hookup Guide](https://docs.sparkfun.com/SparkFun_GNSS_Flex_System)
    - [QGNSS Software *(v2.0)*](https://www.quectel.com/download/qgnss_v2-0_en/)
- Component Documentation
    - [Product Brochure](https://core-electronics.com.au/attachments/localcontent/Quectel_LG290P03_GNSS_Module_Specification_V1_220898312ce.pdf)
    - [RTK Application Note](https://core-electronics.com.au/attachments/localcontent/quectel_gnss_rtk_application_note_v1-0_14714a86199.pdf)
    - [Protocol Specification](https://core-electronics.com.au/attachments/localcontent/quectel_lg290p03_gnss_protocol_specification_v1-0_54985e188dc.pdf)
    - [Hardware Design](https://core-electronics.com.au/attachments/localcontent/quectel_lg290p03_hardware_design_v1-1_145857be62c.pdf)
    - [Firmware Upgrade Guide](https://core-electronics.com.au/attachments/localcontent/quectel_lg290p03_firmware_upgrade_guide_v1-0_42067adab9f.pdf)
- [Building a GNSS System](https://www.sparkfun.com/gps)
- [Qwiic Info Page](https://www.sparkfun.com/qwiic)
- GitHub Hardware Repositories:
    - [GNSS Flex pHAT](https://github.com/sparkfun/SparkFun_GNSS_pHAT)
    - [GNSS Flex Modules](https://github.com/sparkfun/SparkFun_GNSS_Flex_System)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/G/P/GPS-28929-1.jpg)