ISD17120X

Overview

The Nuvoton ISD1700X is a fully integrated, single-chip multi-message voice record and playback device utilizing patented Multi-Level Storage (MLS) technology. It operates on a 2.4 V to 5.5 V supply and supports message durations ranging from 26 seconds to 120 seconds, with sampling frequencies adjustable from 4 kHz to 12 kHz via an external resistor. The device features dual operating modes: standalone push-button control and SPI interface for microcontroller integration. Key hardware components include a differential microphone input with Automatic Gain Control (AGC), auxiliary analog input, PWM Class D speaker driver, and configurable analog output.

Feature Summary

• Integrated message management system enabling standalone push-button operations including record, play, erase, forward, and volume control without external processing.
• Dual-mode architecture supporting autonomous operation or full user control via Serial Peripheral Interface (SPI) commands and Analog Path Configuration (APC) registers.
• High-fidelity audio reproduction through direct Flash storage of uncompressed voice signals, eliminating digital compression artifacts.
• Flexible audio path configuration allowing simultaneous differential microphone inputs and single-ended auxiliary inputs with selectable current or voltage outputs.

Applications

• Electronic systems requiring simple, low-cost voice prompts and announcements
• Security alarm systems and access control devices
• Consumer electronics with interactive voice feedback capabilities

Procurement Notes

Verify the specific suffix of the ISD1700X part number against the official datasheet ordering information table to confirm exact memory capacity, temperature grade, and package type. Ensure compatibility with required sampling frequency resistors and power supply voltages within the specified 2.4 V to 5.5 V range before finalizing procurement.

Selection Notes

Select the appropriate ISD1700 variant based on the required message duration and sampling frequency, which are determined by the external oscillator resistor value. Consider the operating environment temperature range, choosing between commercial (0°C to +70°C) or industrial (-40°C to +85°C) grades. Evaluate whether standalone push-button functionality or SPI-controlled flexibility better suits the system design requirements.

Part Context

The ISD1700 series belongs to Nuvoton's ChipCorder family of voice recording solutions. These devices are designed as self-contained alternatives to complex microcontroller-based audio systems, offering high reliability and low component count. The series leverages proprietary MLS technology to provide robust non-volatile storage for voice data in various consumer and industrial applications.

Replacement Considerations

Direct replacements must match the SOP-28 package and pinout configuration. Verify that alternative devices support similar message durations and sampling frequency ranges. Ensure compatibility with existing analog front-end circuits, including microphone preamplifier requirements and speaker driver impedance specifications.

FAQ

How is the sampling frequency adjusted on the ISD1700?

The sampling frequency is controlled by connecting an external resistor between the ROSC pin and ground. Standard values range from 53 kΩ for 12 kHz to 160 kΩ for 4 kHz, directly influencing the message duration.

What is the function of the vAlert feature?

The optional vAlert feature allows the device to flash an external LED to indicate the presence of a new recorded message, providing a visual status indicator in standalone mode.

Can the ISD1700 drive a speaker directly?

Yes, the device includes a Pulse Width Modulation (PWM) Class D speaker driver capable of directly driving an 8 Ω speaker or a typical buzzer without additional amplification stages.