STMicroelectronics AEK-AUD-D903V1

Overview

AEK-AUD-D903V1 from STMicroelectronics is an automotive-grade evaluation board centered on the FDA903D 1-channel, 45 W Class D digital-input audio amplifier in PowerSSO-36 slug-down package. It supports I²S audio streaming, I²C configuration, hardware MUTE and DC diagnostic interrupt, open-load/short-circuit detection, and thermal protection - enabling rapid prototyping of Electric Vehicle Alerting Sounds (AVAS) and infotainment audio systems.

For engineers reviewing the AEK-AUD-D903V1 datasheet, AEK-AUD-D903V1 pinout, AEK-AUD-D903V1 application, or AEK-AUD-D903V1 equivalent, this board delivers validated interface timing for SPC582B Chorus MCU integration, real-world AVAS compliance testing (≥56 dBA at ≤20 km/h), and fault-diagnostic signal routing via dedicated CD/DIAG and THSENS pins.

Technical Context

The board implements the FDA903D amplifier in its native PowerSSO-36 (exposed pad) package with full support for I²C slave-mode configuration, I²S synchronous audio input (WS, SCLK, SDATA), and legacy mode operation. Its finite state machine enforces strict boot sequencing: exit from Standby requires valid VCC, I²S clock/data, and correct ENABLE pin combination to set I²C address.

Up to eight FDA903D devices can share one I²C bus via unique EN1–EN4 address encoding. The board routes critical diagnostics - including short-to-Vcc/GND, open-load-in-play, and thermal sensing - to discrete test points (TP5, TP4) and interrupt-capable pins (CD/DIAG, THSENS), with hardware MUTE (HWMUTE) and DC bias monitoring (DGSVR, A5VSVR) fully accessible.

Key Specifications

Availability

AEK-AUD-D903V1 is available at Aetrix Electronics and suitable for Electric Vehicle Alerting Sounds (AVAS), automotive infotainment head units, telematics audio output stages, and functional safety–aware audio subsystem validation requiring stable component supply and traceable automotive qualification.

Supply support for AEK-AUD-D903V1 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 automotive, industrial, and power management solutions with AEC-Q100 qualified components.

The AutoDevKit initiative - under which AEK-AUD-D903V1 is released - provides standardized, interoperable evaluation platforms for rapid development of automotive subsystems using ST's automotive MCUs and analog/power ICs.

FAQ

Does AEK-AUD-D903V1 support both I²S and analog audio inputs?

No. AEK-AUD-D903V1 is designed exclusively for digital audio input via I²S interface (I2S_WS, I2S_SCL, I2S_SDA1/2). It does not include ADC or analog input circuitry. Audio must be provided as a synchronized PCM bitstream from a compatible MCU or DSP - such as the SPC582B on AEK-MCU-C1MLIT1.

What is the role of the CD/DIAG pin on AEK-AUD-D903V1?

The CD/DIAG pin is a dedicated open-drain interrupt output that asserts low during detected faults: open load in play mode, short to Vcc or GND, overtemperature, or I²S clock/data loss. It connects directly to MCU GPIO for real-time diagnostic polling or interrupt-driven fault handling without software polling overhead.

Can AEK-AUD-D903V1 operate standalone without an MCU?

No. The FDA903D IC requires I²C initialization to exit Standby mode - including valid VCC, I²S clock/data, and correct EN1–EN4 address configuration. Without an MCU (e.g., SPC582B) providing I²C commands and I²S stream, the amplifier remains in reset and produces no output.

Is thermal protection implemented solely by the FDA903D IC or does the board add external sensing?

Thermal protection is fully integrated within the FDA903D IC and monitored via the THSENS pin, which outputs a voltage proportional to die temperature. AEK-AUD-D903V1 routes THSENS to test point TP5 for external monitoring but adds no additional thermal sensors - all shutdown and warning thresholds are handled internally per AEC-Q100 Class 0 specifications.