This document introduces the features and characteristics of the AT89C51SND1C/AT83C51SND1C MP3 decoder. The product supports MPEG I/II-Layer 3 hardware decoding, supports 48, 44.1, 32, 24, 22.05, 16 kHz sampling rate, supports left and right channel digital volume control, bass, medium, treble control, bass boost sound effect, ancillary data extraction, CRC error and MPEG frame synchronization indicators, supports PCM format and I2S format audio output, with 8-bit MCU C51 core, 2304 bytes of internal RAM, 64K bytes of code storage, 4K bytes of boot flash storage, USB 1.1 controller, full speed data transmission, built-in PLL, MP3 audio clock, USB clock, MultiMedia Card interface compatibility, Atmel DataFlash SPI interface compatibility, IDE/ATAPI interface, 2 channels 10-bit ADC, 8 kHz (8 True Bit), battery voltage monitoring, software controlled voice recording, up to 44 bits of general-purpose I/Os, 4-bit interrupt keyboard port for a 4 x n matrix, SmartMedia software interface, standard two 16-bit counters, hardware watchdog timer, standard full duplex UART, baud rate generator, two wire interface (TWI) master and slave mode controller, SPI master and slave mode controller, power management, power-on reset, software programmable MCU.
The AT8xC51SND1C family combines a C51‑core microcontroller with a hard‑wired MPEG‑I/II‑Layer 3 (MP3) decoder, providing audio playback, volume and tone control, and a rich set of peripheral interfaces. It includes 64 KB of Flash, 2 KB of RAM, and a 4 KB boot flash for in‑system programming via USB or UART.
The document details pin assignments, signal descriptions for ports, timers, audio, USB, MMC, UART, SPI, TWI, ADC, keypad, external memory and system control, as well as electrical characteristics, package options (TQFP80, PLCC84) and typical applications such as MP3 players, car audio, and home multimedia.
| Flash memory | 64 KB |
|---|---|
| RAM | 2 KB |
| Boot Flash | 4 KB |
| Operating voltage | 3 V, +10 % |
| Temperature range | -40 °C to +85 °C |
| Package types | TQFP80, PLCC84 |
| ADC resolution | 2 channels, 10‑bit, 8 kHz |
| USB controller | USB Rev 1.1 Full‑Speed |
| Audio sampling frequencies | 48, 44.1, 32, 24, 22.05, 16 kHz |
| Digital volume control steps | 31 steps per channel |
| General‑purpose I/Os | Up to 44 bits |
The device provides two standard 16‑bit timers/counters.
Development boards are available in TQFP80 and PLCC84 packages.