STMicroelectronics STEVAL-CCA021V1

Overview

STEVAL-CCA021V1 from STMicroelectronics is a USB audio demonstration board built around the STM32F103RE microcontroller and TS4657 stereo DAC, supporting 16–24-bit I²S audio at 32–48 kHz sample rates, with integrated TS2012 (2×2.8 W Class D) and TS4962 (2.8 W mono Class D) amplifiers, and TS472 microphone preamplifier for end-to-end audio capture and playback.

For engineers reviewing the STEVAL-CCA021V1 datasheet, STEVAL-CCA021V1 pinout, STEVAL-CCA021V1 application, or STEVAL-CCA021V1 equivalent, this board serves as a validated reference for USB audio class-compliant firmware development, stereo/mono audio output routing, microphone biasing and ADC interfacing, and Class D amplifier integration with capless outputs and standby control.

Technical Context

The board implements a dual-section architecture: a controller board centered on the STM32F103RE (ARM Cortex-M3, 72 MHz, 512 KB Flash) handling USB device enumeration, I²S master timing, and firmware mode control via push button; and an audio board using the TS4657 to decode digital audio and drive analog outputs through two independent Class D amplifier stages.

Audio input path uses the TS472 preamplifier (2.0 V bias output, active-low standby) feeding the STM32's ADC, while output paths support simultaneous mono speaker/jack (TS4962) and stereo external speakers (TS2012), both filter-free and powered from a shared 5 V rail derived from USB VBUS.

Key Specifications

Availability

STEVAL-CCA021V1 is available at Aetrix Electronics and suitable for USB audio reference design validation, embedded voice interface prototyping, and Class D amplifier evaluation requiring stable component supply, traceable sourcing, and documented signal chain integration.

Supply support for STEVAL-CCA021V1 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 sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate development of USB-peripheral audio systems by integrating verified MCU firmware, audio codec timing, and Class D power stages into a single testable platform.

FAQ

Does STEVAL-CCA021V1 support USB Audio Class 1.0 compliance?

Yes. The board implements USB Audio Class 1.0-compliant descriptors and firmware on the STM32F103RE, enabling plug-and-play operation on Windows, macOS, and Linux without custom drivers. Audio streaming uses standard isochronous endpoints with I²S synchronization managed in firmware.

Can the controller and audio sections be used independently?

Yes. The board features physical jumpers and separate power domains allowing isolation of the STM32F103RE controller section from the TS4657/TS2012/TS4962/TS472 audio section. Each section retains its own voltage regulation, clocking, and I/O headers for standalone use.

What microphone types are compatible with the TS472 input?

The TS472 supports electret condenser microphones (ECM) requiring 2.0 V bias. The onboard microphone is a 2.2 mm SMD ECM with 100 Ω impedance and −42 dBV sensitivity; external ECMs with similar bias current (<0.5 mA) and output impedance can be substituted via the P2 terminal block.

Is firmware source code provided for the STM32F103RE?

Yes. ST provides complete firmware source code-including USB audio class stack, I²S configuration, GPIO control for LEDs/buttons, and amplifier enable sequencing-in the STEVAL-CCA021V1 firmware package (UM1076), compatible with STM32 Standard Peripheral Library and Keil/IAR toolchains.