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Nuvoton ISD15100

2-16 minute ChipCorder® with digital recording and compression

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Key Features
  • 2-16 Minutes recording time
  • Sample Rate up to 48KHz
  • LQFP 48 pacage
  • Multiple messages
  • I2S or SPI Interface
  • Analog audio input
  • Analog Line driver
  • Speaker driver output

The ISD15100 series is a multiple message ChipCorder® featuring digital compression, comprehensive memory management, and integrated analog/digital audio signal paths.

The message management feature is designed to make message recording simple and address-free as well as make code development easier for playback-only applications. This family utilizes flash memory to provide non-volatile audio record/playback for a single-chip solution. Unlike other ChipCorder series, the ISD15100 series provides digital audio interface, faster digital recording, higher sampling frequency, and a signal path with SNR equivalent to 12bit resolution.

The ISD15100 series can take digital audio data via I2S or SPI interface. When I2S input is selected, it will replace the analog audio inputs and will support sample rates of 32, 44.1 or 48 kHz depending upon clock configuration. When SPI interface is chosen, the sample rate of the audio data sent must be one of the ISD15100 supported sample rates.

  • Fast Digital Recording
    • Recording data rate can go up to 1Mbits/second mainly limited by the flash memory write rate.
  • Duration:
    • 2 to 32 minutes based on 8KHz/4bit ADPCM
  • Message Management
    • Perform address-free recording: The ISD15100 allocates memory for new recording requests and upon completion, returns a start address to the host via SPI interface.
    • Store pre-recorded audio (Voice Prompts) using high quality digital compression.
    • Use a simple index based command for playback
    • Execute pre-programmed macro scripts (Voice Macros) designed to control the configuration of the device and play back Voice Prompts sequences and message recordings.
  • Sample Rate
    • Seven record and playback sampling frequencies are available for a given master sample rate. For example, the record and playback sampling frequencies of 4, 5.3, 6.4, 8, -12.8, 16 and 32kHz* are available when the device is clocked at a 32kHz master sample rate.
      (* 32kHz sample rate is available but subject to flash memory write time.)
    • For I²S operation, 32, 44.1 and 48kHz master sample rates are available with record and playback sampling frequencies scaling accordingly.
  • Compression Algorithms
    • For recording
      -ADPCM: 2, 3, 4 or 5 bits per sample
      -µ-Law: 6, 7 or 8 bits per sample
      -Differential µ-Law: 6, 7 or 8 bits per sample
      -PCM: 8, 10 or 12 bits per sample. Each sampled value is stored as a code, offering no compression but preserving maximum resolution

    • For Pre-Recorded Voice Prompts
      -µ-Law: 6, 7 or 8 bits per sample
      -Differential µ-Law: 6, 7 or 8 bits per sample
      -PCM: 8, 10 or 12 bits per sample
      -PEnhanced ADPCM: 2, 3, 4 or 5 bits per sample
      -ariable bit rate optimized compression. This allows best possible compression given a metric of SNR and background noise levels.
  • Oscillator
    • Internal oscillator with internal reference: 2.048 MHz with ±10% deviation as the default
    • Internal oscillator with external resistor reference
    • External crystal or clock input
    • I²S bit clock input
    • crystals and resonators support standard audio sampling rates of 2.048, 4.096, 8.192, 12.288 and11.2896MHz
  • Inputs
    • AUXIN: Analog input with 2-bit gain control configured by SPI command
      -Analog input with the gain set by two external resistors from ANAOUT to ANAIN (default configuration), or Microphone differential input (alternative configuration)
    • Digital AGC:
      -Automatic gain control of digitized data from the analog input
  • Outputs
    • PWM: Class D speaker driver to direct drive an 8Ω speaker or buzzer
    • AUDOUT: configurable as a current or voltage single-ended line driver
    • AUXOUT: a single-ended voltage output
  • I/Os
    • SPI interface: MISO, MOSI, SCLK, SSB for commands and digital audio data
    • I²S interface: I²S_CLK, I²S_WS, I²S_SDI, I²S_SDO for digital audio data
  • Three 8-bit Volume Control set by SPI command for flexible mixing
  • Operating Voltage: 2.7-3.6V
  • Standby Current: 1uA typical
  • Package: Pb-free 48L-LQFP
  • Temperature Options:
    • -40ºC to 85ºC
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