AT85C51SND3B1-7FTUL

Overview

The AT85C51SND3B1-7FTUL is a single-chip digital audio decoder and encoder with a USB 2.0 interface, manufactured by Microchip Technology. It integrates an enhanced 8-bit C51 core operating at up to 24 MHz, featuring 64 Kbytes of internal RAM for application code and data. The device supports MP3, WMA, WAV PCM, ADPCM, and JPEG decoding. It includes three 16-bit stereo D/A converters, a headphone amplifier, and a microphone pre-amplifier. Connectivity options include USB High Speed (480 Mbps) and Full Speed (12 Mbps), along with controllers for NAND Flash and SD/MMC cards. The component operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated proprietary digital signal processor supporting MP3, WMA, and video animation decoding.
• Built-in audio codec with stereo DACs, headphone amplifier, and programmable equalization effects.
• USB 2.0 controller enabling high-speed data transfer and On-The-Go functionality.
• Dedicated memory controllers for NAND Flash and Secure Digital/MultiMediaCard interfaces.

Applications

• Digital music players
• Mobile phones
• Portable navigation devices

Procurement Notes

Verify the specific suffix '7FTUL' against official Microchip documentation to confirm package type and tape-and-reel specifications. Ensure the ordering information matches the required LQFP or BGA variant. Confirm RoHS compliance status as indicated in the latest datasheet revision. Cross-reference the part number with authorized distributors to validate authenticity and supply chain integrity before purchase.

Selection Notes

Select this component for applications requiring integrated audio processing and USB connectivity without external baseband processors. Consider the power management features for battery-operated devices, noting the support for single-cell battery operation via DC-DC conversion. Evaluate the memory requirements against the 64 Kbyte internal RAM limit and external storage capabilities. Ensure the system design accommodates the specific voltage domains and peripheral interfaces provided by the chip.

Part Context

This part belongs to the AT85C51SND3B family of single-chip digital audio solutions. It combines an MCU, audio DSP, and USB controller to reduce system complexity. The family targets portable consumer electronics where space and development time are critical constraints. Derivatives vary by power supply configuration and available audio outputs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult Microchip Technology for current alternative recommendations or updated product line replacements.

FAQ

What audio formats does the AT85C51SND3B1 support?

The device supports MP3, WMA, WAV PCM, and ADPCM decoding, as well as JPEG decoding.

How is the device powered?

It can be powered by a direct USB VBUS supply (5V nominal) or by a single AAA/AA battery through an internal DC-DC converter, providing 1.8V or 3V operation.

What memory interfaces are included?

The chip includes dedicated controllers for NAND Flash (supporting multiple drives) and SD/MMC cards (1-bit and 4-bit modes).