GNSS Evaluation Board Series A
Supported Module List #
- Quectel LC79H
- Quectel L76
- MeiG SGM308
Basic Overview #
The GNSS EVB (A) Board is a fully featured evaluation platform that allows you to explore and utilize all the capabilities of the GNSS module. Since all the necessary components for powering and operating the GNSS module are integrated on the board, you can easily communicate with the module by simply connecting a single USB cable for both power and data.
A passive GPS antenna is built into the board to enable quick startup. However, if needed, you can connect an active antenna via the onboard u.FL connector. A convenient switch is provided to easily toggle between the passive and active antennas.
Feature List #
Key highlights of the board include:
- Built-in GNSS Passive Antenna
- fl Connector for Active Antenna
- RF Swtich for ANT (between Passive & Active)
- USB-to-Serial converter with Micro-USB port for easy debugging and logging
- Level shifter (To 3V3 OR 5V)
- RTC SuperCap
The features and design of this board make it an excellent choice both for getting started and for professional use of GNSS modules.
GNSS EVB (A) Resources #
Function Description #
The main component and interface placement of the evaluation board is shown in the following figure:
Interface Overview #
Following Figure indicates the interface definitions of the GNSS Evaluation Board Series A.
Interfaces of GNSS Evaluation Board Series A #
| Item NO. | Interface | Description |
|---|---|---|
| 1 | Slide Switch | Switch UART1 of GNSS module between 14-pin header and USB-TTL converter. |
| 2 | USB TTL | CH343P USB-to-TTL converter. |
| 3 | USB TYPE-C | USB Type-C for power and data with GNSS module UART. |
| 4 | Push Button | RESET; connected to the module RESET pin. |
| 5 | Push Button | Wake-Up; connected to the module WAKEUP pin. |
| 6 | Regulator | Two regulators to supply board circuits. |
| 7 | Jumper Cap | Connect/disconnect super-cap to the module. |
| 8 | Super Cap | Supercapacitor for GNSS VCC backup. |
| 9 | Slide Switch | Route GNSS RF input between on-board passive antenna and U.FL connector for active antenna. |
| 10 | Antenna | GNSS passive antenna. |
| 11 | U.FL Connector | Connector for GNSS active antenna. |
| 12 | RF Switch | SPDT RF switch IC to select active/passive antenna input. |
| 13 | GNSS Module | Main GNSS module. |
| 14 | Jumper Cap | Connect/disconnect GNSS module VCC. |
| 15 | Jumper Cap | Select 14-pin header I/O level: 3.3 V or 5 V. |
| 16 | Level Shifter | Logic-level shifter to interface module I/O with different logic levels. |
| 17 | 14 Pin-Header | 14-pin expansion I/O connector. |
14pin Header Pin Description #
| PIN NO. | Marking | Description |
|---|---|---|
| 1 | 5V | 5V input voltage to supply board power; connected to USB VBUS directly. |
| 2 | GND | GND |
| 3 | 3V3 | 3.3 V output to supply external circuits or as voltage reference (300 mA MAX). |
| 4 | RXD | Connected to GNSS module RXD pin through level shifter. |
| 5 | GND | GND |
| 6 | TXD | Connected to GNSS module TXD pin through level shifter. |
| 7 | 1PPS | Connected to GNSS module 1PPS pin through level shifter. |
| 8 | 3D F | Connected to GNSS module 3D Fix pin through level shifter (check module datasheet for supported function). |
| 9 | SCL | Connected to GNSS module SCL pin through level shifter. |
| 10 | JAM I | Connected to GNSS module JAM IND pin through level shifter (check module datasheet for supported function). |
| 11 | SDA | U.FL connector for connecting GNSS active antenna. |
| 12 | GEOF | Connected to GNSS module Geofence pin through level shifter (check module datasheet for supported function). |
| 13 | GND | GND |
| 14 | GND | GND |
Evaluation Board Dimensions #
FAQ #