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MAX98357 I2S Speaker HAT with 1W Speaker and 3.2W Class-D Audio Amplifier
The M5Stack U055-B Hat SPK2 is a compact digital-audio speaker expansion designed for the M5StickC PLUS platform. It integrates a MAX98357 digital Class-D audio amplifier with an onboard 1W speaker, allowing compatible M5Stack controllers to generate audio directly from an I2S digital signal. The module provides a cleaner digital-audio path than analogue-input speaker solutions and is suitable for tones, voice prompts, alarms, media playback, and interactive audio applications.
The MAX98357 supports I2S, left-justified, and right-justified digital-audio formats with sample rates from 8 kHz to 96 kHz. It provides up to 3.2W amplifier output under supported load and supply conditions, with a specified signal-to-noise ratio of 103 dB and 0.1% distortion in M5Stack's module specifications. Integrated short-circuit and over-temperature protection improve reliability, while support for Arduino, UIFlow1, and UIFlow2 simplifies development for portable and embedded audio projects.
Key Features
- Digital Audio Amplifier: Integrated MAX98357 Class-D amplifier
- Built-In Speaker: 1W speaker for direct audio playback
- Maximum Amplifier Output: Up to 3.2W
- Digital Audio Interface: I2S control interface
- Audio Formats: Supports I2S, left-justified, and right-justified input
- Sampling Rate: 8 kHz to 96 kHz
- Audio Resolution: Supports 16-bit, 24-bit, and 32-bit I2S/left-justified data at the amplifier IC level
- Stereo Input Handling: Supports left, right, or combined stereo-channel selection at the amplifier stage
- Signal-to-Noise Ratio: 103 dB
- Total Harmonic Distortion: 0.1%
- Supply Voltage: 4.5–5.5V
- Protection: Integrated short-circuit and over-temperature protection
- Compact HAT Design: Designed for StickC-series audio expansion
- Development Support: Arduino, UIFlow1, and UIFlow2
Applications
- Portable audio playback
- Voice prompts
- Alarm and notification sounds
- Smart speaker prototypes
- IoT audio devices
- Interactive user interfaces
- Embedded sound systems
- Educational audio projects
- Portable media devices
- Digital tone generation
- M5StickC PLUS audio expansion
- Smart-device sound feedback
Model Size
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