STMicroelectronics STEVAL-PCC009V4

Overview

STEVAL-PCC009V4 from STMicroelectronics is an opto-isolated universal USB-to-serial bridge demonstration board based on the STM32F103RBT6 microcontroller, providing isolated SPI/I²C/UART communication between a PC and motor control systems. It features 6 GPIOs, 8-pin protocol interface, magnetic isolation for I²C, and opto-isolation for SPI, USART, and GPIO signals.

For engineers reviewing the STEVAL-PCC009V4 datasheet, STEVAL-PCC009V4 pinout, STEVAL-PCC009V4 application, or STEVAL-PCC009V4 equivalent, this board serves as a validated reference design for safe host-to-target serial bridging in industrial motor drives, embedded commissioning, and isolated firmware update interfaces.

Technical Context

The board implements a dual-domain architecture: a USB-connected STM32F103RBT6 (72 MHz Cortex-M3, 128 KB Flash, 20 KB RAM) handles USB enumeration and protocol translation, while six ACPL-072L optocouplers and one ADUM1250 magnetic isolator provide galvanic separation across UART, SPI, and I²C signal paths. Isolation ratings meet reinforced insulation requirements per IEC 60747-5-5.

All 16-pin interface signals - including PA2_TX_DB, PA3_RX_DB, PB6_SCL_DB, PB7_SDA_DB, PA5_SCK_DB, PA6_MISO_DB, PA7_MOSI_DB, and PC0_GPIO_IN10_DB - are individually isolated with 3.75 kVRMS withstand voltage and <10 ns propagation delay skew, enabling real-time motor control feedback loop integrity.

Key Specifications

Availability

STEVAL-PCC009V4 is available at Aetrix Electronics and suitable for motor control commissioning, industrial PLC programming interfaces, and isolated firmware update channels requiring stable component supply and long-term design support.

Supply support for STEVAL-PCC009V4 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, power ICs, sensors, and analog components for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built demonstration platforms that accelerate development of robust, safety-compliant interfaces between host PCs and high-noise embedded systems like motor drives and power converters.

FAQ

Does STEVAL-PCC009V4 support USB CDC ACM class out of the box?

Yes. The onboard STM32F103RBT6 runs pre-flashed firmware implementing the USB Communications Device Class Abstract Control Model (CDC ACM), presenting as a standard virtual COM port without driver installation on Windows 10+, Linux, or macOS. No host-side software modification is required for basic serial bridging.

What is the maximum data rate supported on isolated UART and SPI interfaces?

The isolated UART interface supports up to 1 Mbps (tested with 115.2 kbps–1 Mbps), limited by ACPL-072L propagation delay (max 100 ns) and STM32 USART timing margins. Isolated SPI operates reliably up to 10 MHz clock rate, verified with STM32 SPI peripheral in master mode driving isolated slave peripherals.

Can the 16-pin interface be used simultaneously for UART, SPI, and I²C?

No. The 16-pin header provides pin-multiplexed access to all three protocols, but only one protocol can be active at a time due to shared physical pins (e.g., PA2/PA3 for UART vs. PA5/PA6/PA7 for SPI). Users must configure firmware and target hardware to select the intended interface before connection.

Is JTAG debugging supported, and what tools are compatible?

Yes. The board includes a standard 20-pin JTAG/SWD connector (J1) routed to the STM32F103RBT6's SWDIO and SWCLK pins. It is fully compatible with ST-LINK/V2, ST-LINK/V3, and third-party debuggers supporting ARM CoreSight SWD, enabling firmware development, real-time tracing, and memory inspection.