TTGO T7 V1.3 Mini32 Development Board Pinout and Technical Specifications
Code name: TTGO_T7_V13_Mini32
Manufacturer: LilyGo
TTGO T7 V1.3 Mini32 development board is based on esp32 microcontroller and uses xtensa architecture. This development board has a maximum CPU frequency of 240 MHz and a flash size of 4MB.
🔗 Quick Links
📊 TTGO T7 V1.3 Mini32 Specs
Below you can find the specifications of TTGO T7 V1.3 Mini32, such as features, connectivity options, and TTGO T7 V1.3 Mini32 technical specs.
✨ Features
- 40 digital IO pins
- 16 external interrupt pins
- 16 analog input pins
- 19 PWM pins
🛰️ Connectivity
- WiFi: 802.11 b/g/n (2.4 GHz)
- Bluetooth: 4.2
- BLE: 4.2
📐 Technical specs
| Microcontroller | esp32 |
| Clock Speed | 240 MHz |
| Flash size | 4MB |
| Architecture | xtensa |
🔌 TTGO T7 V1.3 Mini32 Pinout
⚠️ Pins to Avoid or Use with Caution
Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage. Below is a list of pins to avoid or use with caution, categorized for clarity:
- 🛠️ Strapping Pins (Boot Mode & System Behavior) - These pins control boot behavior and flash voltage selection. Pulling them high or low at reset can impact boot mode selection, voltage settings, or debugging access. Avoid altering their state unless necessary.
- 🔗 JTAG Debugging Pins - JTAG is used for low-level debugging and programming. If JTAG is enabled, these pins must remain dedicated to it. Repurposing them as GPIO can disable JTAG debugging features.
- 🔌 USB Communication Pins - These pins are used for USB Serial/JTAG communication. If USB debugging or communication is required, they should not be reassigned as GPIO.
- ⚡ Flash Memory & SPI Pins - Certain GPIOs are hardwired to SPI flash memory and PSRAM. Using them as standard GPIOs may result in system instability, corrupted storage, or boot failure.
- 📡 UART Serial Communication Pins - By default, these pins are used for serial debugging, console output, and firmware uploads. Repurposing them for general I/O may break UART programming or debugging capabilities.
| PIN | Label | Reason | Function |
|---|
📌 Key Takeaway:
- Before using any GPIO, check if it is assigned a critical function.
- Avoid using bootstrapping pins unless you're modifying boot behavior intentionally.
- If JTAG debugging is needed, ensure its pins remain free.
- USB and Flash-related GPIOs should remain dedicated unless you disable their default functions.
✅ Pins Safe to use
- 🔹 OLED RST
- 🔹 OLED SDA
- 🔹 OLED SCL
- 🔹 SDCard CS
- 🔹 SDCard MOSI
- 🔹 SDCard MISO
- 🔹 SDCard SCLK
- 🔹 LORA MOSI
- 🔹 LORA MISO
- 🔹 LORA SCLK
- 🔹 LORA CS
- 🔹 LORA RST
- 🔹 LORA DIO0
- 🔹 DS3231 SDA
- 🔹 DS3231 SCL
- 🔹 LED_BUILTIN
- 🔹 ADC1_CH0
- 🔹 DAC1
- 🔹 DAC2
Unlike restricted pins, these GPIOs are not tied to essential system functions like 🛠️ bootstrapping, 🔌 USB communication, 🔗 JTAG debugging, or ⚡ SPI flash memory, making them the best choices for custom applications and general use.
Why Are These Pins Safe?- Not involved in bootstrapping → These GPIOs do not affect the device’s boot mode or system startup.
- Not linked to flash memory or PSRAM → They won’t interfere with storage or memory access.
- Not dedicated to USB or JTAG → They remain free for general use without affecting debugging or programming.
- No special hardware connections → Unlike some pins that are internally wired to system functions, these remain freely assignable.
🗺️ TTGO T7 V1.3 Mini32 External Pins Mapping Functions
Below you can find the TTGO T7 V1.3 Mini32 pinout. This development board provides 40 digital IO pins, out of which 16 can be used as an external interrupt pins , 16 as analog input pins and 19 pins have Pulse-Width Modulation (PWM) .
| Pin | Function | ESP Pin | Input/Output | Description |
|---|---|---|---|---|
| 1 | OLED RST | GPIO16 | output | OLED Reset |
| 2 | OLED SDA | GPIO21 | bidirectional | I2C Data Line for OLED |
| 3 | OLED SCL | GPIO22 | bidirectional | I2C Clock Line for OLED |
| 4 | SDCard CS | GPIO5 | output | SPI Chip Select for SD Card |
| 5 | SDCard MOSI | GPIO23 | bidirectional | SPI Master Out Slave In for SD Card |
| 6 | SDCard MISO | GPIO19 | bidirectional | SPI Master In Slave Out for SD Card |
| 7 | SDCard SCLK | GPIO18 | bidirectional | SPI Clock Line for SD Card |
| 8 | LORA MOSI | GPIO27 | bidirectional | SPI Master Out Slave In for LoRa |
| 9 | LORA MISO | GPIO19 | bidirectional | SPI Master In Slave Out for LoRa |
| 10 | LORA SCLK | GPIO5 | bidirectional | SPI Clock Line for LoRa |
| 11 | LORA CS | GPIO18 | output | SPI Chip Select for LoRa |
| 12 | LORA RST | GPIO14 | output | LoRa Reset |
| 13 | LORA DIO0 | GPIO26 | input | LoRa Interrupt Pin |
| 14 | DS3231 SDA | GPIO21 | bidirectional | I2C Data Line for DS3231 RTC |
| 15 | DS3231 SCL | GPIO22 | bidirectional | I2C Clock Line for DS3231 RTC |
| 16 | LED_BUILTIN | GPIO2 | output | Built-in LED |
| 17 | ADC1_CH0 | GPIO36 | input | Analog Input Channel 0 |
| 18 | DAC1 | GPIO25 | output | Digital-to-Analog Converter 1 |
| 19 | DAC2 | GPIO26 | output | Digital-to-Analog Converter 2 |
🗺️ TTGO T7 V1.3 Mini32 Pins Mapping Arduino IDE
Below you can find the TTGO T7 V1.3 Mini32 pinout. This development board provides 40 digital IO pins, out of which 16 can be used as an external interrupt pins , 16 as analog input pins and 19 pins have Pulse-Width Modulation (PWM) .
| Pin | Analog | Touch | PWM | Other |
|---|---|---|---|---|
| 0 | A11 | T1 | ||
| 1 | PWM | TX | ||
| 2 | A12 | T2 | PWM | |
| 3 | PWM | RX | ||
| 4 | A10 | T0 | PWM | |
| 5 | PWM | SS | ||
| 12 | A15 | T5 | PWM | |
| 13 | A14 | T4 | PWM | |
| 14 | A16 | T6 | PWM | |
| 15 | A13 | T3 | PWM | |
| 18 | PWM | SCK | ||
| 19 | PWM | MISO | ||
| 21 | PWM | SDA | ||
| 22 | PWM | LED_BUILTIN SCL | ||
| 23 | PWM | MOSI | ||
| 25 | A18 | PWM | DAC1 | |
| 26 | A19 | PWM | DAC2 | |
| 27 | A17 | T7 | PWM | |
| 32 | A4 | T9 | PWM | |
| 33 | A5 | T8 | PWM | |
| 34 | A6 | |||
| 35 | A7 | |||
| 36 | A0 | |||
| 39 | A3 |
🛠️ Default Tools
| Bootloader tool | esptool_py |
| Uploader tool | esptool_py |
| Network uploader tool | esp_ota |
| Bootloader address | 0x1000 |
| Flash mode | dio |
| Boot mode | dio |
| PSRAM type | |
| Maximum upload size | 1280 Kb (1310720 B) |
| Maximum data size | 320 Kb (327680 B) |
The TTGO T7 V1.3 Mini32 development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x1000". Flash mode and boot mode for TTGO T7 V1.3 Mini32 development board by default is dio and dio respectively.
