STM32TQ6401 - Universal TQFP64 STM32 Microcontroller Module

The STM32TQ6401 is a universal microcontroller module designed for STM32 MCUs in TQFP64 packages. It offers a flexible platform for both development and deployment, with support for a wide range of STM32 devices and power configurations.

Features

• Compatible with most STM32 MCUs in TQFP64 package (see note in schematics for exceptions)
• Direct battery operation from a CR2032 cell
• USB-C connector for both programming and external power input
• Standard MLAB pin headers for module interconnection to other MLAB modules
• Onboard 32.768 kHz and 16 MHz crystal oscillators for RTC and system clock
• Multiple LDO regulators providing 3.3V from USB or external 5V input
• USB power switch (TPS2051B) for host/device support
• Boot and reset buttons, debug header (SWD), and optional VCAP configuration

Power Supply

• Battery Operation: Directly powered by a CR2032 cell; suitable for ultra-low power STM32 MCUs
• USB Power: Supplied through USB-C connector; LDO regulator converts 5V to 3.3V
• External Power Input: 2.6 V to 5.2 V via dedicated jumper or header

Connectivity

• USB-C for firmware upload and serial communication
• SWD (Serial Wire Debug) header for in-circuit debugging
• MLAB standard headers for full I/O access

Clock Sources

• Y1: 32.768 kHz crystal for RTC
• Y2: 16 MHz crystal for system clock

Incompatible STM32 Devices

Some STM32 MCUs are not compatible with this module due to VCAP or other special pin requirements. These include (but are not limited to):

• STM32F030R4Tx, STM32F405RGTx, STM32H7xxRxTx
• STM32G4xxRxTx, STM32L5xxRxTxQ, STM32U5xxRxTxQ

Refer to schematic details for a complete list of incompatible devices.

Pin Variants

Special attention is required for the following pins due to variant functions:

• VBAT / VLCD
• VCAP / VDDUSB
• BOOT0 / PH3

Refer to MCU datasheets and the module schematic for proper configuration.

Mounting

• Four 3mm MLAB mounting holes for mechanical stability

Schematic

For detailed pinout, power configuration, and compatibility, refer to the STM32TQ6401A schematic.