STMicroelectronics X-NUCLEO-SNK1M1

Overview

X-NUCLEO-SNK1M1 from STMicroelectronics is a USB Type-C® Power Delivery Sink expansion board based on the TCPP01-M12 protection IC, designed for stacking onto STM32 Nucleo-64 development boards to evaluate USB-C sink functionality, dead battery operation, and Programmable Power Supply (PPS) compliance. It delivers 100 W-rated VBUS protection, supports ±8 kV IEC61000-4-2 ESD on CC lines, and integrates ST715PU33R LDO for board power during source attachment.

For engineers reviewing the X-NUCLEO-SNK1M1 datasheet, X-NUCLEO-SNK1M1 pinout, X-NUCLEO-SNK1M1 application, or X-NUCLEO-SNK1M1 equivalent, key selection considerations include USB-IF certification (TID 5205), adjustable VBUS overvoltage protection up to 22 V, dead battery management capability, and compatibility with UCPD-enabled STM32G0/G4/G0B/L4 MCUs.

Technical Context

The board implements full USB Type-C® sink-side protection using the TCPP01-M12, handling CC line monitoring, VBUS gate control, fault signaling (FLT), and bus voltage conditioning. It supports both UCPD-peripheral-equipped Nucleo boards (e.g., NUCLEO-G071RB) and non-UCPD variants (e.g., NUCLEO-L412RB-P) via hardware-based attach/detach detection and current capability negotiation.

Overvoltage protection is resistor-configurable across five thresholds (6–22 V), with dedicated 6 V OVP on CC lines against VBUS shorting when unplugged. Surge (8/20 µs) and system-level ESD protection are integrated on VBUS and USB 2.0 data lines, while common-mode filtering ensures signal integrity at High-Speed data rates.

Key Specifications

Availability

X-NUCLEO-SNK1M1 is available at Aetrix Electronics and suitable for USB Type-C® PD evaluation, STM32-based embedded prototyping, and industrial USB-C sink interface validation requiring stable component supply and certified reference design fidelity.

Supply support for X-NUCLEO-SNK1M1 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, specializing in microcontrollers, analog ICs, power management, and USB interface solutions for industrial, automotive, and consumer applications.

The X-NUCLEO series targets rapid STM32 ecosystem evaluation, with SNK1M1 specifically engineered to demonstrate certified USB Type-C® sink protection, dead battery recovery, and PPS interoperability in real-world development workflows.

FAQ

Does X-NUCLEO-SNK1M1 require firmware to operate as a USB-C sink?

No - basic sink functions (attach/detach detection, VBUS presence, current capability identification) operate autonomously via TCPP01-M12 hardware logic. UCPD peripheral firmware (e.g., X-CUBE-TCPP) is only required for advanced PD messaging, PPS negotiation, or custom policy engine implementation on compatible STM32 MCUs.

Can X-NUCLEO-SNK1M1 be used with non-STMicroelectronics host controllers?

Yes - it functions as a passive, standards-compliant USB-C sink device. When stacked on any Nucleo board (or adapted via external MCU), it presents correct Rd termination, monitors CC lines, controls VBUS gate, and asserts FLT on fault - independent of vendor-specific controller IP.

What is the role of the ST715PU33R LDO on this board?

The ST715PU33R provides regulated 3.3 V output to power the stacked Nucleo board's logic rails when a USB-C source is attached - enabling operation even if the Nucleo's onboard battery or input supply is fully depleted (dead battery mode).

How is overvoltage protection configured for different VBUS thresholds?

Voltage thresholds are set by populating specific resistors (R29–R33) per Table 1 in DB4427 Rev 8. For example, 22 V OVP requires R33 = 5.36 kΩ; 13 V uses R31 = 9.1 kΩ. All configurations maintain USB-IF compliance and preserve the board's 100 W rating.