ISD4002-180S

Overview

The ISD4002-180S is a single-chip voice record and playback device from the ISD4002 ChipCorder series, manufactured by Nuvoton Technology Corporation. It provides an 180-second recording duration using direct analog storage in on-chip Flash memory. The device operates at a sampling frequency of 5.3 kHz with a typical filter passband of 2.3 kHz. It requires a supply voltage between 2.7 V and 3.3 V and supports SPI or Microwire serial interfaces for control. Available in a 28-SOIC package, it features AutoMute functionality and non-volatile message retention.

Feature Summary

• Direct analog storage of voice signals into non-volatile Flash memory without digitization or compression
• AutoMute feature that attenuates background noise during silence periods to improve audio quality
• Fully addressable multiple-message capability managed via SPI or Microwire serial interface
• Integrated on-chip oscillator and power conditioning for low-power standalone operation

Applications

• Cellular phones and portable communication devices requiring multi-message messaging
• Microcontroller-based systems needing high-quality voice prompts or announcements
• Portable consumer products utilizing single-chip voice solutions

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package type and revision status prior to integration. Check for end-of-life notices or obsolescence warnings. Ensure environmental compliance documentation matches project requirements. Validate pin compatibility with existing PCB layouts.

Selection Notes

Select this model when 180 seconds of analog voice storage is required. Choose based on the 5.3 kHz sampling rate suitability for specific speech clarity needs. Consider the 28-SOIC package for surface-mount assembly constraints. Evaluate power consumption profiles against battery-operated system limits. Verify SPI interface compatibility with the host microcontroller.

Part Context

This component belongs to the ISD4002 series, which includes variants with 120, 150, and 240-second durations. All members share the same core architecture and interface protocols but differ in sampling rates and filter bandwidths to accommodate varying storage time requirements within the same physical footprint.

Replacement Considerations

Nuvoton recommends the I3900FYI as a manufacturer-recommended replacement. Verify functional equivalence regarding pinout and electrical specifications before substitution.

FAQ

What is the recommended external clock frequency for the ISD4002-180S?

If an external clock is used via the XCLK pin, the recommended frequency is 682.7 kHz to maintain the specified 5.3 kHz sampling rate.

How does the AutoMute feature function?

The AutoMute feature minimizes background noise by applying 6 dB of attenuation during periods of silence. It uses a peak detector circuit connected to the AM CAP pin to sense signal amplitude.

What is the maximum input signal level for optimal recording quality?

In single-ended mode, the maximum input signal should be 32 mVp-p. In differential mode, the maximum input signal for both ANA IN+ and ANA IN- pins should be 16 mVp-p.