ISD1790EYR

Overview

The ISD1790EYR is a member of the Nuvoton ISD1700 ChipCorder series, a fully integrated single-chip multi-message voice record and playback device. It operates within a voltage range of 2.4V to 5.5V and supports user-selectable message durations from 26 to 120 seconds. The sampling frequency is adjustable from 4 kHz to 12 kHz via an external resistor. The device features non-volatile message storage using patented Multi-Level Storage (MLS) technology and includes an on-chip oscillator, microphone preamplifier with Automatic Gain Control (AGC), auxiliary analog input, anti-aliasing filter, smoothing filter, volume control, and a Pulse Width Modulation (PWM) Class D speaker driver.

Feature Summary

• Integrated Multi-Level Storage (MLS) for non-volatile message retention without external memory
• Dual operating modes supporting both standalone push-button applications and microcontroller-controlled SPI interfaces
• Proprietary message management system enabling automatic address location self-management for multiple messages
• Built-in audio processing including microphone preamplifier with AGC and PWM Class D speaker driver

Applications

• Electronic systems requiring simple push-button voice messaging
• Battery-powered or line-powered portable devices
• Microcontroller-based embedded voice recording systems
• Industrial and consumer electronics needing durable voice prompts

Procurement Notes

Verify the specific suffix 'EYR' against official Nuvoton documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the SOIC or PDIP packages associated with this series. Confirm that the required message duration and sampling frequency settings align with the external resistor values needed for your design.

Selection Notes

Select this component when a complete voice solution without external flash memory is required. Consider the ISD1700 series if message durations between 26 and 120 seconds are sufficient. Evaluate the need for SPI interface versus standalone operation. Compare against other series if higher sampling rates or different voltage ranges are necessary for the target application.

Part Context

The ISD1790 belongs to the NuMicro ISD1700 ChipCorder family, designed for high-quality voice recording in compact forms. This series replaces older discrete solutions by integrating all necessary analog and digital components onto a single chip. It is part of Nuvoton's portfolio aimed at simplifying voice interaction in electronic products through robust, low-power architecture.