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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 |
