ISD17120SYI

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1. DESCRIPTION

The Nuvoton® ISD1700 ChipCorder® Series is a high quality, fully integrated, singlechip multi-message voice record and playback device ideally suited to a variety of electronic systems. The message duration is user selectable in ranges from 26 seconds to 120 seconds, depending on the specific device. The sampling frequency of each device can also be adjusted from 4 kHz to 12 kHz with an external resistor, giving the user greater flexibility in duration versus recording quality for each application. Operating voltage spans a range from 2.4 V to 5.5 V to ensure that the ISD1700 devices are optimized for a wide range of battery or line-powered applications. The ISD1700 is designed for operation in either standalone or microcontroller (SPI) mode. The device incorporates a proprietary message management system that allows the chip to self-manage address locations for multiple messages. This unique feature provides sophisticated messaging flexibility in a simple push-button environment. The devices include an on-chip oscillator (with external resistor control), microphone preamplifier with Automatic Gain Control (AGC), an auxiliary analog input, anti-aliasing filter, Multi-Level Storage (MLS) array, smoothing filter, volume control, Pulse Width Modulation (PWM) Class D speaker driver, and current/voltage output. The ISD1700 devices also support an optional “vAlert” (voiceAlert) feature that can be used as a new message indicator. With vAlert, the device flashes an external LED to indicate that a new message is present. Besides, four special sound effects are reserved for audio confirmation of operations, such as “Start Record”, “Stop Record”,“Erase”, “Forward”, “Global Erase”, and etc.

2. Feature

    1. Integrated message management system for single-chip, push-button applications

        - REC : Recording level trigger

        - PLAY: Edge-triggered for a single message or level-triggered for sequential loop playback

        - ERASE: Edge-triggered erase of first or last message or level-triggered erase of all messages

        - FWD: Edge-triggered to advance to the next message or to quickly scan messages during playback

        - VOL: 8-level output volume control

        - RDY INT: Ready or busy status indication

        - RESET: return to default state

        - Automatic power off after each operating cycle

    2. Selectable sampling frequency controlled by external oscillator resistor

    3. Selectable message duration

        - Wide selection from 20 seconds to 480 seconds depending on sampling frequency selected

    4. Messages and Operational Indicators

        - Four customizable sound effects (SE) for sound indication

        - An optional vAlert (voiceAlert) to indicate the presence of a new message

        - LED: stay on during recording, blink during playback, advance and erase operations

    5. Dual operation mode

        - Standalone mode:

           - Integrated message management technology

           - Automatic power-off after each operating cycle

        - SPI mode:

           - Options are fully user selectable and controlled via APC registers and various SPI commands

           - Two independent input channels

        - MIC+/MIC-: Differential microphone input with AGC (Automatic Gain Control)

        - AnaIn: Single-ended auxiliary analog input for recording or feedthrough

    6. Dual output channels

        - Differential PWM Class D speaker output directly drives 8 Ω speakers or typical buzzer

        - Configurable AUD (current) or AUX (voltage) single-ended output to drive external audio amplifier

    7. ChipCorder standard function

        - High-quality, natural speech and audio reproduction

        - 2.4V to 5.5V operating voltage

        - 100-year message retention period (typical)

        - 100,000 logging cycles (typical)

    9. Temperature options:

        - Commercial: 0°C to +50°C (die); 0°C to +70°C (packaged unit)

        - Industrial: -40°C to +85°C (package unit)

  10. Package type: Die, PDIP and SOIC available

  11. Package option: lead-free package unit

3. Pin configuration

4. Pin Description

5. Function Description

Records are stored in on-chip flash memory, providing zero-power message storage. This unique single-chip solution is achieved through Nuvoton's patented Multi-Level Storage (MLS) technology. Audio data is stored directly in solid-state memory without digital compression, providing high-quality speech and music reproduction. The voice signal can enter the chip through two independent paths: differential microphone input and single-ended analog input. For output, the ISD1700 provides a pulse width modulated (PWM) Class D speaker driver and a separate analog output. The PWM can directly drive a standard 8Ω speaker or typical buzzer, while the separate analog output can be configured as a single-ended current or voltage output to drive an external amplifier. In stand-alone mode, the ISD1700 device automatically goes into power-down mode to save power after the operation is complete. In SPI mode, the user has complete control over the operation of the device through the serial interface. This includes random access to any location in the memory array by specifying the start and end addresses of the operation. SPI mode also allows access to the Analog Path Configuration (APC) registers. This register allows flexible configuration of audio paths, inputs, outputs, and mixing. The APC default configuration for standalone mode can also be modified by storing the APC data into a non-volatile register (NVCFG) loaded at initialization. Leveraging the capabilities of the ISD1700 series, designers have the control and flexibility to implement voice functionality into high-end products.