ESP32 A7670 LTE Cat 1 Module

A7670 LTE Cat 1 Module image

A7670

Protocol: UART

Overview

The A7670 is a versatile LTE Cat 1 module that provides reliable communication capabilities for various IoT applications. Its compact design, high-speed data connectivity, and multiple interfaces make it an ideal choice for projects requiring cellular and GPS functionalities.

About A7670 LTE Cat 1 Module

The A7670 is a high-performance LTE Cat 1 module that supports LTE-TDD, LTE-FDD, GSM, GPRS, and EDGE, making it ideal for IoT applications requiring stable and efficient wireless communication. It provides downlink speeds of up to 10 Mbps and uplink speeds of up to 5 Mbps, ensuring reliable data transmission.

Key Features

  • LTE Cat 1 Support – Optimized for IoT applications needing moderate data rates.
  • Multi-Network Compatibility – Works with LTE-TDD, LTE-FDD, GSM, GPRS, and EDGE.
  • Fast & Reliable Data Transfer – Supports 10 Mbps (downlink) and 5 Mbps (uplink).
  • Versatile Applications – Suitable for smart meters, industrial IoT, and asset tracking.

🔗 Still deciding on a SIM module? Check the ESP32 SIM Modules Comparison Table for a breakdown of LTE, 3G, and GPRS options. 🚀

Where to Buy

A7670 LTE Cat 1 Module

Starting from

31.16$ per unit

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Technical Specifications

Frequency Bands LTE-TDD, LTE-FDD, GSM, GPRS, EDGE
Data Rates LTE Cat 1: 10 Mbps (DL), 5 Mbps (UL); EDGE: 236.8 Kbps (DL/UL); GPRS: 85.6 Kbps (DL/UL)
Operating Voltage 3.4V to 4.2V
Operating Temperature -40°C to +85°C
Dimensions 24mm x 24mm x 2.3mm

Pinout Configuration

The VCC pin is used to supply power to the sensor, and it typically requires 3.3V or 5V (refer to the datasheet for specific voltage requirements). The GND pin is the ground connection and must be connected to the ground of your ESP32.

The A7670 pinout includes:

  • VBAT: Power supply input (3.4V to 4.2V).
  • GND: Ground connection.
  • TXD: UART Transmit Data (connects to microcontroller RX).
  • RXD: UART Receive Data (connects to microcontroller TX).
  • PWRKEY: Power on/off control (active low).
  • NETLIGHT: Network status indication.
  • STATUS: Module operating status indication.
  • ANT_MAIN: Main antenna connection for LTE/GSM.
  • ANT_GPS: Antenna connection for GPS.
  • SIM_VDD: SIM card power supply.
  • SIM_DATA: SIM card data I/O.
  • SIM_CLK: SIM card clock.
  • SIM_RST: SIM card reset.

Wiring with ESP32

To interface the A7670 with a microcontroller, follow these steps:
  • Connect VBAT to a stable power supply within the range of 3.4V to 4.2V.
  • Connect GND to the system ground.
  • Connect TXD to the microcontroller's RX pin.
  • Connect RXD to the microcontroller's TX pin.
  • Control the PWRKEY pin to power the module on or off (active low).
  • Connect the ANT_MAIN to a suitable LTE/GSM antenna for network connectivity.
  • Optionally, connect the ANT_GPS to a GPS antenna for location services.
  • Connect the SIM card interface pins (SIM_VDD, SIM_DATA, SIM_CLK, SIM_RST) to a SIM card holder as per the hardware design guidelines.

Troubleshooting Guide

Common Issues

❌ Module Fails to Power On

📱 SIM Card Not Recognized

📶 Poor Network Signal or Connectivity Issues

💬 AT Commands Not Responding

🌍 GPS Functionality Not Working

Debugging Tips

🔍 Serial Monitor

⚡ Voltage Checks

Code Examples

Arduino Example

C++
🔧

ESP-IDF Example

C++
🏠

ESPHome Example

YAML
🛠️

PlatformIO Example

C++
🐍

MicroPython Example

Python

Conclusion

The ESP32 A7670 LTE Cat 1 Module is a powerful SIM sensor that offers excellent performance and reliability. With support for multiple development platforms including Arduino, ESP-IDF, ESPHome, PlatformIO, and MicroPython, it's a versatile choice for your IoT projects.

For optimal performance, ensure proper wiring and follow the recommended configuration for your chosen development platform.

Always verify power supply requirements and pin connections before powering up your project to avoid potential damage.