A7670 LTE Cat 1 Module

Name: A7670 LTE Cat 1 Module
Brand: ESP32
Price: 31.16 USD
Availability: InStock

View on Amazon

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.

Quick Navigation

📋 Specs 📍 Pinout 🔌 Wiring 🔧 Debug

Code Examples

Arduino

C++ Framework

ESP-IDF

Native Framework

ESPHome

YAML Configuration

PlatformIO

IDE & Toolchain

MicroPython

Python Framework

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

Get Your A7670

Starting from

31.16$ per unit

Amazon.com Ships worldwide

View Price

Amazon.de Ships to EU

View Price

AliExpress Best value option

View Price

💡 Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.

Technical Specs

A7670 Specifications

Complete technical specification details for A7670 LTE Cat 1 Module

📊 Technical Parameters

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

Download Full Datasheet

Pin Configuration

A7670 Pinout

The A7670 pinout includes power supply, UART communication, control pins, status indicators, dual antenna connections (LTE/GSM and GPS), and SIM card interface pins for LTE Cat 1 cellular and GPS functionality.

Visual Pinout Diagram

Pinout Diagram Primary

Total Pins

Pin Types

Power

Control

Quick Tips

LTE

Cat 1 module with multi-network support (LTE-TDD, LTE-FDD, GSM, GPRS, EDGE),Data rates: 10 Mbps downlink, 5 Mbps uplink,Integrated multi-constellation GNSS (GPS, GLONASS, BeiDou, Galileo)

Operating

voltage: 3.4V to 4.2V,Peak current: 2A during transmission,Default UART baud rate: 115200 bps

Supports

voice calls, SMS, and data transfer,Requires SIM card for cellular connectivity,Dual antenna connections: LTE/GSM and GPS

Pin Descriptions

Pin Name	Type	Description	Notes
1 VBAT	Power	Power supply input (3.4V to 4.2V)	Requires stable power with peak current up to 2A
2 GND	Ground	Ground connection	Common ground
3 TXD	UART TX	UART Transmit Data (connects to microcontroller RX)	Default baud rate: 115200 bps
4 RXD	UART RX	UART Receive Data (connects to microcontroller TX)	Default baud rate: 115200 bps
5 PWRKEY	Control	Power on/off control (active low)	Pull low for at least 500ms to power on
6 NETLIGHT	Status	Network status indication	LED indicator for network registration
7 STATUS	Status	Module operating status indication	Shows module power state
8 ANT_MAIN	Antenna	Main antenna connection for LTE/GSM	Requires external LTE antenna
9 ANT_GPS	Antenna	Antenna connection for GPS	Requires external GPS antenna

Connection Guide

Wiring A7670 to ESP32

Connect the A7670 to your ESP32 via UART for AT command communication. The module requires a stable 3.4V-4.2V power supply with sufficient current capacity (peak 2A). External antennas are required for both LTE/GSM and GPS functionality.

Visual Wiring Diagram

Wiring Diagram Recommended

A7670 LTE Cat 1 Module wiring with ESP32

Connections

Connection Status

Required

Optional

Protocol

UART

Pin Connections

A7670 Pin	ESP32 Pin	Description
1 VBAT Required	3.7V-4.2V Power Supply	Provide stable power (NOT from ESP32 pin)
2 GND Required	GND	Common ground connection
3 TXD Required	GPIO16 (RX2)	A7670 TX to ESP32 RX
4 RXD Required	GPIO17 (TX2)	A7670 RX to ESP32 TX
5 PWRKEY Optional	GPIO4	Power control (pull low to power on)
6 ANT_MAIN Required	External LTE Antenna	Connect LTE/GSM antenna
7 ANT_GPS Optional	External GPS Antenna	Connect GPS antenna (optional)

⚠️

CRITICAL: Use a dedicated power supply (3.4V-4.2V, 2A peak) - DO NOT power from ESP32 pin!

Default

UART baud rate is 115200 bps

LTE

Cat 1 provides 10 Mbps downlink, 5 Mbps uplink

External

LTE/GSM antenna is mandatory for network connectivity

GPS

antenna is optional but required for location services

Pull

PWRKEY low for at least 500ms to power on the module

Monitor

NETLIGHT pin for network registration status

Insert

active SIM card before powering on

Supports

multiple frequency bands - check local carrier compatibility

Ensure

good antenna placement for optimal signal reception

Multi-constellation

GNSS: GPS, GLONASS, BeiDou, Galileo

Help & Support

A7670 Troubleshooting

Common issues and solutions to help you get your sensor working

Common Issues

Debugging Tips

Additional Resources

Datasheet

Technical specifications and guidelines

Code Examples

A7670 Programming Examples

Ready-to-use code examples for different platforms and frameworks

#include <SoftwareSerial.h>

SoftwareSerial a7670(10, 11); // RX, TX
#define PWRKEY 9

void powerOnA7670() {
    pinMode(PWRKEY, OUTPUT);
    digitalWrite(PWRKEY, LOW);
    delay(1000); // Hold PWRKEY low for 1 second
    digitalWrite(PWRKEY, HIGH);
    delay(5000); // Wait for the module to initialize
}

void setup() {
    Serial.begin(9600);
    a7670.begin(9600);
    powerOnA7670();

    // Test AT command
    a7670.println("AT");
    delay(1000);
    while (a7670.available()) {
        Serial.write(a7670.read());
    }

    // Set SMS text mode
    a7670.println("AT+CMGF=1");
    delay(1000);
    while (a7670.available()) {
        Serial.write(a7670.read());
    }

    // Send SMS
    a7670.println("AT+CMGS=\"+1234567890\""); // Replace with recipient's number
    delay(1000);
    a7670.print("Hello from A7670");
    a7670.write(26); // CTRL+Z to send
    delay(5000);
    while (a7670.available()) {
        Serial.write(a7670.read());
    }
}

void loop() {
    // Add code to handle incoming messages or other functionalities
}

This Arduino sketch interfaces with the A7670 module using the SoftwareSerial library. The module is powered on by toggling the PWRKEY pin (GPIO9). An AT command is sent to test communication. The module is configured to SMS text mode using the AT+CMGF command, and an SMS is sent to a specified recipient using AT+CMGS. The message is finalized with CTRL+Z (ASCII 26) to trigger transmission. Additional functionalities, such as retrieving GPS data, handling incoming SMS, or establishing internet connectivity via LTE, can be implemented in the loop.

#include <stdio.h>
#include "driver/uart.h"
#include "driver/gpio.h"
#include "freertos/task.h"

#define TX_PIN 17
#define RX_PIN 16
#define PWRKEY_PIN 4
#define UART_PORT UART_NUM_1

void init_uart() {
    uart_config_t uart_config = {
        .baud_rate = 9600,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
    };

    uart_param_config(UART_PORT, &uart_config);
    uart_set_pin(UART_PORT, TX_PIN, RX_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_PORT, 1024, 0, 0, NULL, 0);
}

void power_on_a7670() {
    gpio_set_direction(PWRKEY_PIN, GPIO_MODE_OUTPUT);
    gpio_set_level(PWRKEY_PIN, 0);
    vTaskDelay(1000 / portTICK_PERIOD_MS); // Hold PWRKEY low for 1 second
    gpio_set_level(PWRKEY_PIN, 1);
    vTaskDelay(5000 / portTICK_PERIOD_MS); // Wait for the module to initialize
}

void app_main(void) {
    init_uart();
    power_on_a7670();

    char *test_cmd = "AT\r\n";
    uart_write_bytes(UART_PORT, test_cmd, strlen(test_cmd));

    while (true) {
        char data[128];
        int len = uart_read_bytes(UART_PORT, data, sizeof(data), 100 / portTICK_PERIOD_MS);
        if (len > 0) {
            data[len] = '\0';
            printf("Response: %s\n", data);
        }
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

This ESP-IDF example initializes UART communication with the A7670 module and powers it on using the PWRKEY pin (GPIO4). The UART interface is configured with GPIO17 as TX and GPIO16 as RX. An AT command is sent to test communication, and responses from the module are printed to the console. Additional functionalities, such as SMS, GNSS data retrieval, or LTE-based internet connectivity, can be implemented.

uart:
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 9600

switch:
  - platform: gpio
    name: "A7670 Power"
    pin:
      number: GPIO4
      inverted: true

switch:
  - platform: template
    name: "Send AT Command"
    turn_on_action:
      - uart.write: "AT\r\n"

sensor:
  - platform: custom
    lambda: |-
      return {nullptr};
    sensors:
      - name: "A7670 Response"

This ESPHome configuration sets up UART communication with the A7670 module using GPIO17 (TX) and GPIO16 (RX) at 9600 baud. A GPIO-based switch is used to control the PWRKEY pin (GPIO4) for powering the module on or off. A template switch allows sending the AT command, and a custom sensor can be implemented to process responses from the module. Additional configurations can be added for SMS, LTE, or GNSS functionalities.

platformio.ini

[env:a7670]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

main.cpp

#include <HardwareSerial.h>
#include <Arduino.h>

HardwareSerial a7670(1);
#define PWRKEY 4

void power_on_a7670() {
    pinMode(PWRKEY, OUTPUT);
    digitalWrite(PWRKEY, LOW);
    delay(1000); // Hold PWRKEY low for 1 second
    digitalWrite(PWRKEY, HIGH);
    delay(5000); // Wait for initialization
}

void setup() {
    Serial.begin(115200);
    a7670.begin(9600, SERIAL_8N1, 16, 17); // RX, TX
    power_on_a7670();

    // Test AT command
    a7670.println("AT");
    delay(1000);
    while (a7670.available()) {
        Serial.write(a7670.read());
    }

    // Send SMS
    a7670.println("AT+CMGF=1"); // Set SMS to text mode
    delay(1000);
    a7670.println("AT+CMGS=\"+1234567890\""); // Replace with recipient's number
    delay(1000);
    a7670.print("Hello from A7670");
    a7670.write(26); // CTRL+Z to send SMS
    delay(5000);
}

void loop() {
    // Handle incoming data or other functionalities
}

This PlatformIO code interfaces with the A7670 module using HardwareSerial on an ESP32. The `power_on_a7670` function toggles the PWRKEY pin (GPIO4) to activate the module. The AT command is sent to test communication, and SMS functionality is implemented in the setup. Additional functionalities, like GNSS data retrieval or LTE-based internet connectivity, can be added in the loop.

from machine import UART, Pin
import time

# Initialize UART
uart = UART(2, baudrate=9600, tx=17, rx=16)
pwrkey = Pin(4, Pin.OUT)

def power_on_a7670():
    pwrkey.value(0)
    time.sleep(1)  # Hold PWRKEY low for 1 second
    pwrkey.value(1)
    time.sleep(5)  # Wait for module to initialize

def send_at(command):
    uart.write(command + '\r\n')
    time.sleep(1)
    while uart.any():
        print(uart.read().decode('utf-8'), end='')

# Power on the module
power_on_a7670()

# Test communication
send_at('AT')

# Send SMS
send_at('AT+CMGF=1')  # Set SMS to text mode
send_at('AT+CMGS="+1234567890"')  # Replace with recipient's number
uart.write("Hello from A7670" + chr(26))

This MicroPython code communicates with the A7670 module over UART. The `power_on_a7670` function activates the module using the PWRKEY pin (GPIO4). The `send_at` function sends AT commands and prints the responses. The script initializes the module, tests communication, and demonstrates how to send an SMS. Additional logic for handling GNSS or LTE-based internet connectivity can be added.

Summary

Wrapping Up A7670

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.