T-A7670E

Overview

T-A7670E R2 is a 4G LTE Cat1 IoT development board based on ESP32-WROVER-E (4 MB Flash, 8 MB PSRAM) and the A7670E cellular module. Supports LTE-FDD B1/B3/B5/B8/B20 and GSM 900/1800 MHz — covering Europe, Middle East, South Korea, and Thailand. Features Nano SIM slot, 12 GPIO, 8 ADC, 2 DAC, capacitive touch pins, SPI, I2C, TF card, 18650 battery support, and 2 × 16-pin 2.54 mm IO expansion. 111 × 34 × 19 mm.

The differences between T-A76xx series variants are described in the SIM comparison table.

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
LilyGO-T-A76XX Examples	✓		LTE, GPS, AT command examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Clone the LilyGO-T-A76XX repository
4. Open platformio.ini and uncomment the desired example
5. Click ✓ to compile, click → to upload

Arduino

1. Install Arduino IDE
2. Add ESP32 boards URL: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
3. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	ESP32 Dev Module
Upload Speed	921600
CPU Frequency	240 MHz (WiFi/BT)
Flash Frequency	80 MHz
Flash Mode	QIO
Flash Size	4MB (32Mb)
Partition Scheme	default 4MB with spiffs (1.2MB APP/1.5MB spiffs)
PSRAM	Enabled
Core Debug Level	None

4. Click Upload

Development Platforms

1. PlatformIO
2. Arduino IDE
3. ESP-IDF

Video

Key Features

• ESP32-WROVER-E @ 240 MHz, 4 MB Flash, 8 MB PSRAM, Wi-Fi + BT 5.0
• A7670E LTE Cat1: B1/B3/B5/B8/B20, GSM 900/1800 MHz (Europe/ME/Korea/Thailand)
• Nano SIM, 12 GPIO, 8 ADC, 2 DAC, capacitive touch, SPI, I2C, UART
• TF card, 18650 battery, 2 × 16-pin 2.54 mm expansion, 111 × 34 × 19 mm

Product Parameters

Feature	Specification
MCU	ESP32-WROVER-E @ 240 MHz
Flash	4 MB
PSRAM	8 MB
Wi-Fi	2.4 GHz 802.11 b/g/n
Bluetooth	Bluetooth 5.0 LE
Cellular	A7670E LTE Cat1
LTE-FDD	B1/B3/B5/B8/B20
GSM	900/1800 MHz
Regions	Europe, Middle East, South Korea, Thailand
SIM	Nano SIM
Storage	TF card, 18650 battery holder
USB	1 × Type-C (USB + OTG)
Expansion	2 × 16-pin 2.54 mm IO
Mounting Holes	4 × 2 mm
Dimensions	111 × 34 × 19 mm

Pin Diagram

Dimension Diagram

Schematic

• T-A7670X V1.4 Schematic

Datasheet

• ESP32 Datasheet

Software Development

• LilyGO-T-A76XX GitHub Repository

Dependent Libraries

• Adafruit_BusIO
• Adafruit-GFX-Library
• Adafruit_NeoPixel
• Adafruit_SSD1306
• TinyGPSPlus
• SensorsLib
• StreamDebugger
• TinyGSM-fork

FAQ

• Q. Why does my board keep failing to upload programs? A. Hold down the BOOT button and try uploading again.

• Q. Which regions does A7670E support? A. Europe, Middle East, South Korea, and Thailand (LTE-FDD B1/B3/B5/B8/B20, GSM 900/1800 MHz).

Version History

Version	Release Date	Update Description
T-A7670E R2	—	Initial R2 version