Holtek公司的HT82A824R是高性能USB喇叭OTP MCU,集成了USB 2.0全速兼容SIE及符合微軟WHQL要求之高性能數字模擬轉換器與功率放大器和嵌入式微控制器.器件采用Holtek(盛群)八位微控制器為其核心，可提供8Kx16之程序內存容量、864x8數據存儲器以及512x8的只讀數據存儲器，并提供HALT指令。其操作電壓為4.0V~5.5V，系統頻率最高可達16MHz，同時可提供21條I/O,主要用在i-Phone/i-Pod/i-Pad Docking產品.本文介紹了HT82A824R主要特性,方框圖和應用電路.
HT82A824R高性能USB喇叭微控制器
This HT82A824R is an 8-bit high performance RISC microcontroller designed for USB Speaker related product applications. The HT82A824R combines a 16-bit DAC, USB transceiver, SIE (Serial Interface Engine), audio class processing unit, FIFO, 8-bit MCU into a single chip. The Sigma-Delta DAC in the HT82A824R is operating at the 48kHz or 44.1kHz sampling rate. The HT82A824R has a digital programmable gain amplifier. The gain range is from -32dB to +6dB. The external stereo audio input can be the other source of power amplifier by software control.
The HT82A824R has a Human Interface Device function that allows a user to control the playback volume at the device side. The HT82A824R also can mute the analog output signal by the operation of HID buttons.
HT82A824R主要特性:
CPU Features
●●USB 2.0 Full Speed Compatible
●●USB spec V1.1 full speed operation and USB audio device class spec V1.0
●●Operating voltage at fSYS = 6M/12MHz: 4.0V~5.5V
●●48KHz/44.1KHz sampling rate for audio playback selected by software
●●Embedded class AB power amplifier for ear phone speaker driving (32Ω)×2
●●Embedded High Performance 16-bit stereo audio Sigma-Delta DAC
●●Pass Microsoft® DTM (WHQL) USB audio device
●●Audio playback digital volume control
●●6 endpoints supported including endpoint 0
●●Support 1 Control, 2 Interrupts, 1 Isochronous and 2 Bulk transfers
●●One hardware implemented Isochronous transfer
●●Total FIFO size are 528 bytes (8, 8, 384, 32, 32, 64 for EP0~EP2,EP4~EP6)
●●8192×16 Program Memory
●●352×8 MCU type data memory RAM (Bank 0, Bank 9)
●●128×8×4 Speaker Output Data or 12-bit ADC Converted Data RAM (Bank1, Bank2, Bank3, Bank4)
●●USB Audio and 12-bit ADC Stereo Data Capture DMA
●●128×8×4 MCU Type General Purpose Data RAM (Bank5, Bank6, Bank7, Bank8)
●●6-channel 12-bit A/D converter
●●2-channel PWM function shared with PB2~PB3
●●Dual Programmable Attenuator for 2-channel external stereo audio input
●●Universal Asynchronous Receiver Transmitter (UART) shared with PB0~PB1
●●SPI interface (master and slave mode) shared with PC4~PC7
●●Programmable frequency divider (PFD) function shared with PC0
●●Power-down function and wake-up reduce power consumption
●●Up to 21 bidirectional I/O lines
●●Dual 16-bit programmable Timer/Event Counters with overflow interrupts
●●Watchdog Timer
●●16-level subroutine nesting
●●Bit manipulation instruction
●●16-bit table read instruction
●●63 powerful instructions.
●●All instructions executed within one or two machine cycles
●●Low voltage reset function((3.0V±0.3V)
●●48-pin LQFP package
圖1. HT82A824R方框圖
圖2. HT82A824R應用電路圖
詳情請見:
http://www.holtek.com.tw/PDF/computer/ht82A824Rv100.pdf
