FGM842D TE-B User Guide

Introduction

This document introduces the FGM842D series TE-B and its hardware and air interface connections with customer applications. It helps customers quickly understand the hardware interface characteristics, RF characteristics, electrical characteristics, mechanical specifications, and other related information of the FGM842D series TE-B.

Product Overview

The FGM842D series TE-B is a development board that supports all interfaces of the FGM842D series. It can be used for basic functionality testing and further development of the FGM842D series.

Top View and Bottom View

TE-B Component Layout

Key Features

Functional Block Diagram

Operating Instructions

The FGM842D series TE-B is used for firmware upgrades or development and debugging of IoT applications based on the FGM842D series modules. The following sections introduce the specific operation process:

Getting Started

Interface Diagram

Operating Steps

1. Download and install the USB-to-UART chip driver. The driver can be downloaded from the following link: CH341SER.EXE;

2. Use a Micro USB data cable to connect J0201 or J0202 (USB-to-UART interface) to the computer. Then, check the "Device Manager" on the computer to see the serial port as shown below. "USB-SERIAL CH340 (COM11)" connects to the TE-B's UART1 (main UART) for firmware upgrades and AT command communication. If connected to the TE-B's UART2 (debug UART), it is used for debugging and log output. For more details on UART configuration, refer to Harware Design.

   

   During use, S0302 can be used to reset the module.

Power Consumption Testing Guide

For more detailed power consumption test steps and instructions, please refer to Power Consumption Test.

Testing Tools

Tools and equipment required for power consumption testing:

• FGM842D series TE-B;
• DC power analyzer;
• Wires, soldering iron, solder, and wire stripper for soldering power supply wires on the TE-B.

Power Consumption Testing

To test power consumption in maximum transmission power, sleep, and other states using the TE-B, follow these steps:

1. Remove the resistor at reference designator R0307 to disconnect the module from other parts;

2. Solder a wire to pin 1 of J0303 as the VBAT power supply terminal for the module; solder a wire to any pin of J0201 as GND. This allows the external power supply to independently power the module;

3. Use a DC power analyzer to supply 3.3 V to the soldered wires. The module will power on automatically;

4. Connect the TE-B to a PC using a Micro USB data cable and perform power consumption testing in different modes.

Appendix Reference Documents