ISD17240PYI

Overview

The Nuvoton ISD17240PYI is a single-chip multi-message voice record and playback device from the ISD1700 ChipCorder series. It utilizes patented Multi-Level Storage (MLS) technology to store audio data directly in on-chip Flash memory without digital compression, ensuring high-quality natural voice reproduction. The device supports selectable sampling frequencies ranging from 4 kHz to 12 kHz via an external oscillator resistor, which determines the message duration. For the ISD17240 variant, maximum recording durations range from 160 seconds at 12 kHz up to 480 seconds at 4 kHz. It operates within a supply voltage range of 2.4 V to 5.5 V and features dual operating modes: standalone push-button control and microcontroller SPI interface.

Feature Summary

• Integrated message management system enabling standalone operation with automatic power-down after each cycle
• Dual input channels including differential microphone with Automatic Gain Control (AGC) and auxiliary analog input
• Dual output capabilities featuring a PWM Class D speaker driver for direct load driving and configurable analog output
• Proprietary non-volatile storage providing zero-power retention and resistance to magnetic fields

Applications

• Standalone voice messaging systems requiring simple push-button interfaces
• Industrial equipment status announcements and safety warnings
• Consumer electronics with integrated voice feedback functions
• Automotive subsystems requiring durable voice recording solutions

Procurement Notes

Verify the specific package type required for the application, as the ISD1700 series is available in SOIC and PDIP formats. Confirm the temperature grade, noting that industrial versions support -40°C to +85°C while commercial grades are limited to 0°C to +70°C. Ensure the ordering suffix matches the desired packaging and environmental specifications provided in the official datasheet.

Selection Notes

Select the ISD17240PYI when extended message duration is critical, offering up to 480 seconds at lower sampling rates. Evaluate the need for standalone versus SPI control; the standalone mode simplifies hardware design by removing the need for a host processor. Consider the power supply constraints, as the device supports a wide voltage range suitable for both battery and line-powered applications.

Part Context

The ISD17240PYI belongs to the Nuvoton ISD1700 ChipCorder family, which represents a generation of fully integrated voice recording ICs. This series distinguishes itself by eliminating the need for external flash memory or DSP chips. The ISD17240 specifically provides higher capacity compared to shorter-duration variants like the ISD1730 or ISD1760, catering to applications requiring longer continuous messages.

Replacement Considerations

Direct replacements within the ISD1700 series include the ISD17240SOI (SOIC package) or ISD17240PDIP (PDIP package). Cross-series upgrades may involve the ISD1900 series for devices requiring address trigger modes or wider voltage ranges, though pin compatibility and feature sets differ significantly.