ISD1790EYI

Overview

The ISD1790EYI is a single-chip multiple-message record/playback device from Nuvoton’s ISD1900 ChipCorder series. It operates within a voltage range of 2.4V to 5.5V and supports sampling frequencies selectable between 4 kHz and 12 kHz via an external resistor, which also determines message duration from 10.6 to 32 seconds. The device features dual operating modes: address trigger for variable message durations and direct trigger for fixed message configurations. It includes a selectable differential microphone input with Automatic Gain Control (AGC) or single-ended analog input, and a Class D PWM speaker driver capable of directly driving speakers or buzzers.

Feature Summary

• Supports dual operating modes including address trigger for variable message lengths and direct trigger for fixed message configurations.
• Integrates a selectable differential microphone input with AGC or single-ended analog input under feed-through mode.
• Features a built-in Class D PWM speaker driver that can directly drive typical speakers or buzzers without additional amplification.

Applications

• Standalone voice recording and playback systems
• Message units requiring address-triggered variable duration recording
• Direct-trigger applications with fixed message segments

Part Context

The ISD1790EYI belongs to the ISD1900 ChipCorder family, representing a single-chip solution for multiple-message record and playback. This series is designed primarily for standalone applications but can also interface with microcontrollers when necessary. The EYI suffix typically denotes the SOIC package variant within this product line.