ISD4002-240P

Overview

The ISD4002-240P is a single-chip voice record/playback device from the Nuvoton ISD4002 series, designed for 3-volt portable applications. It provides a 240-second recording duration at a 4.0 kHz sampling frequency with a typical filter passband of 1.7 kHz. The CMOS-based component integrates an on-chip oscillator, anti-aliasing and smoothing filters, an audio amplifier, and high-density multilevel Flash memory. Control is managed via SPI or Microwire interfaces, supporting fully addressable multiple messages. 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.

Feature Summary

• Utilizes patented multilevel storage technology to directly store analog speech samples in non-volatile Flash memory without digitization or compression.
• Features an AutoMute function that attenuates background noise by 6 dB during periods of silence to improve audio quality.
• Supports fully addressable message management through SPI or Microwire serial interfaces, allowing for flexible record and playback control.
• Includes an internal interrupt system that signals End of Message (EOM) or Overflow (OVF) conditions to the host microcontroller.

Applications

• Cellular phones and other portable consumer electronics requiring voice messaging capabilities
• Industrial control systems and unmanned equipment maintenance alarms
• Home security devices utilizing direct language transmission instead of simple tones

Procurement Notes

Verify the specific package variant against the datasheet ordering information, as the 'P' suffix typically denotes PDIP packaging while other variants exist. Confirm the industrial temperature range rating if operation outside commercial limits is required. Ensure the external clock requirements match the 4.0 kHz sampling rate specifications for the 240-second duration model.

Selection Notes

Select this component when a 240-second recording time is necessary, which corresponds to a 4.0 kHz sampling rate. Note that lower sampling rates reduce audio fidelity compared to the 8.0 kHz option found in shorter duration models. Ensure the application supports SPI or Microwire communication protocols for addressing and control operations.

Part Context

The ISD4002-240P belongs to the ISD4002 ChipCorder series, which offers durations ranging from 120 to 240 seconds. This series is part of Nuvoton's (formerly Winbond) portfolio of single-chip voice solutions. The 240-second variant specifically targets applications requiring longer message lengths at the cost of reduced bandwidth compared to the 120-second model.

Replacement Considerations

ISD4002-120P, ISD4002-150P, ISD4002-180P