STMicroelectronics X-NUCLEO-SRC1M1

Overview

X-NUCLEO-SRC1M1 from STMicroelectronics is a USB Type-C™ Power Delivery source expansion board based on the TCPP02-M18 port controller, designed to evaluate source-role power negotiation, VBUS/CC line protection, and dual-role data (DRD) functionality when stacked on STM32 Nucleo-64 boards. It supports up to 100 W SPR profiles, includes ESD protection (±8 kV contact), 8/20 μs surge immunity, short-to-VBUS CC pin protection, and integrated ST715PU33R LDO for board power supply.

For engineers reviewing the X-NUCLEO-SRC1M1 datasheet, X-NUCLEO-SRC1M1 pinout, X-NUCLEO-SRC1M1 application, or X-NUCLEO-SRC1M1 equivalent, this board enables rapid validation of USB Type-C™ source behavior-including attach/detach detection, 5 V fixed and PPS-capable power delivery, VBUS discharge control, and I²C-configurable port management-on UCPD-enabled (e.g., NUCLEO-G071RB) and non-UCPD (e.g., NUCLEO-F446RE) STM32 Nucleo platforms.

Technical Context

The board implements full USB Type-C™ source functionality using the TCPP02-M18, which handles CC line monitoring, VBUS sourcing control via external MOSFET (STL40DN3LLH5), and I²C-based configuration through dedicated pins (SCL/SDA, I2C_ADD, ENABLE, FLGn). It supports both fixed 5 V and programmable power supply (PPS) modes per USB PD 3.0 specification.

Protection architecture includes bidirectional ESD clamps on CC1/CC2/D+/D− (IEC61000-4-2 Level 4), overvoltage/overcurrent sensing on VCONN and VBUS, active VBUS discharge circuitry, and common-mode filtering on D+/D− lines. The ST715PU33R LDO delivers regulated 3.3 V at 85 mA to power the host Nucleo board.

Key Specifications

Availability

X-NUCLEO-SRC1M1 is available at Aetrix Electronics and suitable for USB Type-C™ source evaluation, STM32-based PD firmware development, and industrial embedded USB connectivity validation requiring stable component supply and traceable sourcing.

Supply support for X-NUCLEO-SRC1M1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and sensors for industrial, automotive, and consumer applications.

This board belongs to ST's X-NUCLEO ecosystem of STM32 Nucleo-compatible expansion boards, engineered to accelerate USB Type-C™ and Power Delivery system prototyping with validated hardware-software integration and X-CUBE-TCPP firmware library support.

FAQ

Does X-NUCLEO-SRC1M1 require an external power supply?

No. When stacked on an STM32 Nucleo-64 board, it draws power from the Nucleo's 5 V rail. Its integrated ST715PU33R LDO supplies 3.3 V to the Nucleo board. An external USB-C source is required only during PD negotiation testing - not for board operation itself.

Can X-NUCLEO-SRC1M1 operate without a UCPD-capable STM32 MCU?

Yes. In 5 V-only source mode, it functions on non-UCPD Nucleo boards (e.g., NUCLEO-F446RE) to demonstrate basic USB-C attach/detach, VBUS enablement, and current capability reporting - without data role switching or PD messaging.

What firmware support is provided for X-NUCLEO-SRC1M1?

ST provides the X-CUBE-TCPP software expansion package, including application examples for both UCPD-based (e.g., NUCLEO-G071RB) and non-UCPD (e.g., NUCLEO-F446RE) Nucleo boards, with drivers for TCPP02-M18 register access, PD state machine handling, and protection event logging.

How is VBUS short-circuit protection implemented?

VBUS overcurrent protection uses the TCPP02-M18's ISENSE pin to monitor current via an external shunt resistor, triggering automatic shutdown and FLGn assertion. Short-to-VBUS protection is achieved via internal clamping diodes on CC1/CC2 pins, preventing damage during miswiring or cable faults.