ISD4002-120SI

Overview

The ISD4002-120SI is a single-chip voice record/playback device from the ISD4002 series, offering a 120-second recording duration. It operates on a single 3V supply and utilizes multilevel Flash memory for non-volatile storage. The device features an internal oscillator with a sampling frequency of 8.0 kHz and a typical filter passband of 3.4 kHz. Control is managed via a Serial Peripheral Interface (SPI) or Microwire interface. Key electrical parameters include a typical operating current of 15 mA during playback and 25 mA during recording, with a standby current of 1 µA. The component supports multiple messages and includes an AutoMute feature for noise attenuation.

Feature Summary

• Single-chip solution integrating analog transceivers, filters, audio amplifier, and high-density multilevel Flash memory.
• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• AutoMute functionality provides background noise attenuation during silence periods to improve audio clarity.
• Fully addressable architecture allows for flexible management of multiple messages through SPI control.

Applications

• Cellular phones and portable communication devices
• Multiple-message paging systems
• Voice messaging modules for consumer electronics

Procurement Notes

Verify the specific package type corresponding to the SI suffix against official manufacturer documentation before integration. Confirm that the required operating temperature range aligns with commercial specifications. Ensure power supply decoupling meets the recommended guidelines for separate analog and digital grounds to maintain signal integrity.

Selection Notes

Select this model when a fixed 120-second recording capacity at 8.0 kHz sampling rate is required. Consider alternative series members if different durations or sampling frequencies are needed. Verify that the host microcontroller supports the necessary SPI protocol timing and voltage levels for reliable communication.

Part Context

The ISD4002 series belongs to Nuvoton's ChipCorder family of direct analog storage devices. These components replace traditional magnetic media by storing audio signals directly in Flash memory cells. The series offers various duration options to suit different application requirements while maintaining high audio fidelity and low power consumption.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer resources for end-of-life notifications or recommended alternatives if discontinuation occurs.

FAQ

How does the ISD4002 handle audio input?

The device accepts analog audio signals via differential or single-ended inputs on the ANA IN+ and ANA IN- pins, which are processed by an internal analog transceiver and stored directly in Flash memory.

What is the function of the RAC pin?

The Row Address Clock (RAC) pin outputs a signal indicating the status of the memory row, useful for message management techniques such as determining when to switch rows during continuous recording or playback.

Can the ISD4002 operate without a microcontroller?

No, the device is designed to be controlled by a microprocessor or microcontroller via the SPI or Microwire interface for all record, playback, and configuration operations.