STMicroelectronics STEVAL-PCC011V1

Overview

STEVAL-PCC011V1 from STMicroelectronics is an evaluation kit implementing a full-speed USB-to-RS232 bridge using the ST72F65 microcontroller, enabling serial port expansion on USB-equipped PCs without proprietary drivers. It supports baud rates up to 256 kbps, half-duplex RS232 communication, and 7/8-bit data with configurable parity - deployed in industrial PC peripheral interface prototyping.

For engineers reviewing the STEVAL-PCC011V1 datasheet, STEVAL-PCC011V1 pinout, STEVAL-PCC011V1 application, or STEVAL-PCC011V1 equivalent, this board provides verified USB enumeration behavior, ICC-based reprogramming capability, RS232 level-shifting via ST3222, and exposed GPIOs for custom firmware integration and host-attached I/O extension.

Technical Context

The board implements a hardware-accelerated USB 1.1 full-speed (12 Mbps) device stack in the ST72F65 MCU, with dedicated USB transceiver pins (USBDP/USBDM) and internal pull-up control (USBEN). RS232 signaling is handled by the ST3222 TSSOP20 transceiver, generating ±5.5 V levels from 3.3 V logic using charge-pump capacitors.

System clocking uses a 12 MHz crystal (Y2) for the MCU and a separate 12 MHz ceramic resonator (Y1) for auxiliary timing. All GPIOs - including PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, and PE0–PE7 - are routed to J4/J7 headers, supporting user-defined digital I/O, PWM, ADC input, and serial peripheral interfacing.

Key Specifications

Availability

STEVAL-PCC011V1 is available at Aetrix Electronics and suitable for industrial PC interface development, embedded serial gateway validation, and USB peripheral prototyping requiring stable component supply and documented reference design reuse.

Supply support for STEVAL-PCC011V1 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

The STEVAL evaluation kit series targets rapid hardware validation and firmware development for ST's microcontroller peripherals, emphasizing plug-and-play USB connectivity, open-source firmware examples, and standardized form factors for lab and production engineering use.

FAQ

Does STEVAL-PCC011V1 require a custom USB driver on Windows?

No. The board enumerates as a standard CDC ACM (Communication Device Class Abstract Control Model) device, supported natively by Windows XP SP2 and later, Linux kernel ≥2.6.10, and macOS without additional drivers. The ST72F65 firmware implements full USB descriptor compliance for automatic class recognition.

Can the RS232 interface operate at TTL levels instead of ±5.5 V?

No. The ST3222 transceiver is configured exclusively for RS232 voltage levels (±5.5 V). There is no onboard jumper or configuration option to bypass the charge pump or route raw MCU UART signals directly; all serial I/O passes through the RS232-level shifter.

What debugging interfaces does STEVAL-PCC011V1 support?

The board supports only in-circuit communication (ICC) via the 5-pin J6 header for firmware download and basic memory access. It does not include SWIM, JTAG, or UART bootloader modes - debugging requires ICC-compatible tools such as ST's STVP or third-party ST7 ICC programmers.

Is the 12 MHz crystal (Y2) mandatory for USB operation?

Yes. USB full-speed timing requires precise 0.25% frequency tolerance; the 12 MHz crystal (Y2) is the only validated clock source for USB transceiver synchronization. The 12 MHz ceramic resonator (Y1) serves non-USB functions and cannot substitute for Y2 in USB enumeration or data transfer.