ISD4004-16MSYI

Overview

The ISD4004-16MSYI is a single-chip voice record/playback solution from Nuvoton's ISD4004 series, designed for portable applications. It utilizes direct analog storage technology to store audio signals in on-chip Flash memory without A/D conversion. The device supports a recording duration of 16 minutes at a sampling frequency of 4.0 kHz and a typical filter passband of 1.7 kHz. It operates on a single 3V supply with low power consumption, featuring an operating current of 25 mA during recording and 1 µA standby current. The chip includes an internal oscillator, AutoMute feature, and SPI/Microwire interface for microcontroller control.

Feature Summary

• Direct analog storage technology preserves natural voice quality without digital compression artifacts
• Integrated AutoMute function attenuates background noise during silence periods
• Non-volatile Flash memory retains data for up to 100 years without power
• Supports multiple message management via fully addressable memory rows

Applications

• Portable electronic devices requiring voice messaging
• Cellular phones and mobile communication terminals
• Smart home security systems with voice alerts
• Industrial control panels with status announcements

Procurement Notes

Verify the specific suffix 'MSYI' against the manufacturer's official ordering guide to confirm package type (SOIC) and temperature grade (Industrial -40°C to +85°C). Ensure compatibility with system voltage requirements of 2.7V to 3.3V. Check for lead-free packaging compliance if required by regional regulations. Confirm availability through authorized distributors as part numbers may have lifecycle variations.

Selection Notes

Select this model when a 16-minute recording duration is required. Note that the 4.0 kHz sampling rate limits the audio bandwidth to approximately 1.7 kHz, suitable for speech but not high-fidelity music. Compare with ISD4004-08/10/12 variants if shorter durations or higher audio quality are needed. Ensure the application can support the SPI interface timing and separate analog/digital ground routing to minimize noise interference.

Part Context

The ISD4004 series represents Nuvoton's evolution of direct analog storage technology, succeeding earlier ISD3300 series chips. It integrates a CMOS-based microcontroller interface, anti-aliasing filters, and audio amplifiers into a single package. The series is optimized for battery-powered portable devices due to its low voltage operation and zero-power non-volatile storage capabilities.

Replacement Considerations

ISD4004-16M is the base commercial variant; verify if industrial temperature rating is mandatory. ISD4003 series offers similar functionality but with different duration options (4-8 minutes). No direct pin-compatible substitutes exist within the same family for identical 16-minute industrial specs.