STMicroelectronics STEVAL-PCC001V1

Overview

STEVAL-PCC001V1 from STMicroelectronics is an obsolete evaluation kit implementing a full-speed USB 1.1 to RS-232 serial bridge using the ST72F651 microcontroller, supporting baud rates up to 256 kbps, half-duplex communication, and 7-/8-bit data with parity. It provides a plug-and-play USB-to-serial port solution for PCs without native RS-232, with accessible GPIOs for custom peripheral integration.

For engineers reviewing the STEVAL-PCC001V1 datasheet, STEVAL-PCC001V1 pinout, STEVAL-PCC001V1 application, or STEVAL-PCC001V1 equivalent, this board serves as a hardware reference for USB-to-serial bridge firmware development, driverless enumeration via CDC ACM class, and RS-232 level-shifting validation using ST3222 transceivers.

Technical Context

The board implements a CDC ACM (Communication Device Class Abstract Control Model) USB device stack on the ST72F651 - a 8-bit Flash microcontroller with integrated USB PHY, 64-pin TQFP package, and 12 MHz crystal oscillator. It uses the ST3222 dual RS-232 transceiver for ±15 kV ESD-protected level translation between TTL and RS-232 voltage domains.

USB enumeration occurs without proprietary drivers by leveraging standard Windows CDC ACM class support. The ICC connector enables in-circuit reprogramming of user firmware, while J6 jumper selects between internal pull-up and external control of USBEN pin for reset management.

Key Specifications

Availability

STEVAL-PCC001V1 is available at Aetrix Electronics and suitable for legacy system maintenance, industrial field service tooling, embedded prototyping, and educational USB interface labs requiring stable component supply despite its obsolete status.

Supply support for STEVAL-PCC001V1 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, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer applications.

This kit belongs to ST's STEVAL evaluation platform family, engineered to accelerate USB peripheral development and demonstrate ST's 8-bit ST7 microcontroller capabilities in cost-sensitive, low-power serial bridge applications.

FAQ

Does STEVAL-PCC001V1 require a custom USB driver on Windows?

No. It enumerates as a standard CDC ACM device using Microsoft's built-in usbser.sys driver. No INF file or third-party software is needed - the board appears as COMx upon connection, verified on Windows XP through Windows 10.

What is the role of the ST3222 transceiver on this board?

The ST3222 converts the ST72F651's 3.3 V TTL UART signals (TX/RX) to full RS-232 voltage levels (±12 V typical) and provides ±15 kV human-body-model ESD protection on both DB9 pins, enabling robust connection to legacy serial equipment.

Can the onboard ST72F651 be reprogrammed with custom firmware?

Yes. The ICC (In-Circuit Communication) header (J7) provides SWIM-compatible programming access to the ST72F651's Flash memory. ST's STVP or ST Visual Develop tools can flash new firmware without removing the MCU from the board.

Is the 12 MHz crystal mandatory for USB operation?

Yes. The ST72F651 requires a 12 MHz ±0.25% accuracy crystal (CSTCW12M0) to meet USB full-speed timing tolerance (±0.25%). Substituting with a lower-accuracy resonator or different frequency will cause USB enumeration failure.