T-A7670X
Overview
T-A7670X R2 is a 4G LTE Cat1 IoT development board based on ESP32-WROVER-E (4 MB Flash, 8 MB PSRAM) and the A7670 series cellular module. All variants share the same PCB design — the only difference is the modem chip, which determines the supported regional frequency bands. 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. Optional GPS version available.
The differences between T-A76xx series variants are described in the SIM comparison table.
Variant Comparison
| Variant | Modem | Region | LTE-FDD | LTE-TDD | GSM |
|---|---|---|---|---|---|
| T-A7670E | A7670E | Europe / Middle East / Africa / South Korea / Thailand | B1/B3/B5/B8/B20 | — | 900/1800 MHz |
| T-A7670G | A7670G | Global | B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28/B66 | B34/B38/B39/B40/B41 | 850/900/1800/1900 MHz |
| T-A7670SA | A7670SA | South America / New Zealand / Australia | B1/B2/B3/B4/B5/B7/B8/B28/B66 | — | 850/900/1800/1900 MHz |
Quick Start
Example Support
| Example | PlatformIO/Arduino | ESP-IDF | Description |
|---|---|---|---|
| LilyGO-T-A76XX Examples | ✓ | LTE, GPS, AT command examples |
PlatformIO
- Install Visual Studio Code and Python
- Search for and install the PlatformIO IDE extension in VS Code
- Clone the LilyGO-T-A76XX repository
- Open
platformio.iniand uncomment the desired example - Click ✓ to compile, click → to upload
Arduino
- Install Arduino IDE
- Add ESP32 boards URL:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json - 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 |
- Click Upload
Development Platforms
Related Videos
Key Features
- ESP32-WROVER-E @ 240 MHz, 4 MB Flash, 8 MB PSRAM, Wi-Fi + BT 5.0
- A7670X LTE Cat1, supports GSM/GPRS/EDGE and multi-band 4G (variant dependent)
- 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 | A7670X LTE Cat1 (variant dependent) |
| 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
T-A7670E
T-A7670G
T-A7670SA
Dimension Diagram
Schematic
Datasheet
Software Development
Dependent Libraries
- Adafruit_BusIO
- Adafruit-GFX-Library
- Adafruit_NeoPixel
- Adafruit_SSD1306
- TinyGPSPlus
- SensorsLib
- StreamDebugger
- TinyGSM-fork
FAQ
Q. Why does my board fail to upload? A. Hold down the BOOT button and try uploading again.
Q. What is the difference between T-A7670E / G / SA? A. The PCB and firmware are identical. The only difference is the modem chip, which determines the supported frequency bands and regions — choose the variant that matches your deployment region.
Q. Is GPS included? A. The standard version does not include GPS. A GPS version is available — contact customer service.
Q. Does the 4G version support voice calls? A. No — the 4G version supports data transmission only. Voice calls and SMS over circuit-switched networks are not supported.
Version History
| Version | Release Date | Update Description |
|---|---|---|
| T-A7670X R2 | — | Current version |