ISD1790SY

Overview

The ISD1790SY is a single-chip voice record and playback integrated circuit manufactured by Nuvoton Technology Corporation. It belongs to the ChipCorder series, designed for standalone or microcontroller-controlled applications. The device features non-volatile message storage using patented Multi-Level Storage (MLS) technology, allowing for high-quality audio recording without external memory components. It supports user-selectable sampling frequencies ranging from 4 kHz to 12 kHz via an external resistor, which also determines the recording duration. The IC operates within a wide voltage range of 2.4 V to 5.5 V and includes an on-chip oscillator, microphone preamplifier with Automatic Gain Control (AGC), and a Class D PWM speaker driver capable of directly driving speakers or buzzers.

Feature Summary

• Integrated Multi-Level Storage (MLS) array for non-volatile message retention without external flash memory
• Dual operating modes supporting both address trigger and direct trigger configurations for flexible message management
• Built-in differential microphone input with Automatic Gain Control (AGC) and selectable analog input feed-through
• On-chip Pulse Width Modulation (PWM) Class D speaker driver for direct connection to audio output devices

Applications

• Standalone voice messaging systems requiring push-button operation
• Electronic greeting cards and novelty items with recorded audio content
• Industrial control panels with voice prompts and status announcements
• Consumer appliances featuring interactive voice feedback mechanisms

Procurement Notes

Verify the specific suffix codes against official Nuvoton datasheets to confirm package type and temperature grade. Ensure compatibility with the target system's voltage levels and clock requirements. Request manufacturer documentation to validate the authenticity of the component lot. Confirm that the ordering part number matches the exact functional specification required for the design.

Selection Notes

Select this component when a self-contained voice solution is needed without external memory controllers. Evaluate the required recording duration against the available sampling frequency options. Consider the interface requirements if microcontroller integration is necessary versus standalone button operation. Verify that the power supply constraints align with the specified 2.4 V to 5.5 V operating range.

Part Context

The ISD1790SY is part of the Nuvoton ISD1700 ChipCorder family, which provides fully integrated voice recording capabilities. This series is distinguished by its proprietary MLS technology, eliminating the need for complex external storage interfaces. It serves as a cost-effective alternative to discrete audio solutions in applications where voice interaction is a key feature.