NUVOTON ISD15102FYI

The ISD15100 series is a multi-message ChipCorder featuring digital compression, comprehensive memory management, flash storage, 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 with durations up to 8 minutes for a single-chip solution. Unlike other ChipCorder series, the ISD15100 series provides an I²S 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. The ISD15100 series has built-in analog audio inputs, analog audio line driver, and speaker driver output. The two analog audio inputs to the device are: (1) AUXIN has a fixed gain configured by SPI command, and (2) ANAIN/ANAOUT has a fixed gain amplifier with the gain set by two external resistors. ANAIN/ANAOUT can also be used as a microphone differential input (ANAIN/ANAOUT becomes MIC+/MIC-) in conjunction with an automatic gain control (AGC) circuit configured by SPI command. Analog outputs are available in three forms: (1) AUXOUT is a single-ended voltage output; (2) AUDOUT can be configured as either a single-ended voltage output or a single-ended current output; (3) BTL (bridge-tied-load) is a differential voltage output.

• 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.
• 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 32 kHz are available when the device is clocked at a 32kHz master sample rate. For I2S operation, 32, 44.1 and 48kHz master sample rates are available with record and playback sampling frequencies scaling accordingly.
• 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; Enhanced ADPCM: 2, 3, 4 or 5 bits per sample; Variable-bit-rate optimized compression. This allows best possible compression given a metric of SNR and background noise levels.
• Internal oscillator with internal reference: 2.048 MHz with ±10% deviation
• Internal oscillator with external resistor: 2.048 MHz with ±5% deviation when Rosc is 80k-ohm
• 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 and 11.2896MHz
• AUXIN: Analog input with 2-bit gain control configured by SPI command
• ANAIN/ANAOUT: Analog input with the gain set by two external resistors from ANAOUT to ANAIN, or Microphone differential input (ANAIN/ANAOUT becomes MIC+/MIC-)
• Digital AGC: Automatic gain control of digitized data from the analog input
• PWM: Class D speaker driver which can deliver typical output power: 8Ω load: 350mW @3.3v, 420mW @3.6v; 4Ω load: 520mW @3.3v, 620mW @3.6v
• AUDOUT: configurable as a current or voltage single-ended line driver
• AUXOUT: a single-ended voltage output
• BTL: differential voltage output which can deliver typical output power: 63mW for 8Ω load, 115mW for 4Ω load.
• 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
• 8 GPIO pins (4 of the 8 GPIO pins share with I²S).
• Three 8-bit Volume Control set by SPI command for flexible mixing