Holtek has presently released its latest USB Speaker OTP MCU, the HT82A824R. The device, having a fully integrated USB 2.0 Full Speed Compatible SIE and high performance digital to analog converter, also incorporates a high power audio amplifier within its embedded microcontroller giving users a convenient platform for the design and manufacture of related audio products.
The embedded UART and various hardware resources make the HT82A824R suitable for product areas such as iPhones, iPods, and iPad docking stations. Auto run applications can also be easily implemented using the internal SPI and USB bulk endpoints in the HT82A824R together with external SPI Flash Memory.
Following all the features of the HT82A822R, the HT82A824R, after conversion of the played music into the frequency domain, can display the played audio spectrum on an LCD. By also simultaneously changing the backlight color, users can be provided with a visually appealing audio output display.
The HT82A824R uses a Holtek 8-bit MCU core, has 8K × 16 of Program Memory, 864 × 8 of Data Memory and 512 × 8 of Read-only Memory. A HALT instruction is provided for power saving purposes. With an operating voltage of 4.0V~5.5V, a system frequency up to 16MHz and 21 I/O lines, the device forms an excellent controller for high level professional USB speaker products.
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
The outstanding characteristics of the HT82A824R device, coupled with Holtek's excellent integrated MCU development tools and writers, give designers the means to quickly design and create customized products, in turn providing customers with an even greater range of diverse products and business opportunities.
