ISD4002-180SY

Overview

The ISD4002-180SY is a single-chip voice record and playback solution from the ISD4002 ChipCorder series by Nuvoton Technology Corporation. It utilizes multilevel Flash memory to store analog audio signals directly, providing 180 seconds of recording duration at a sampling frequency of 5.3 kHz. The device operates on a single 3-volt supply with low power consumption, featuring an internal oscillator and AutoMute noise attenuation. Control is managed via a standard SPI interface, allowing for fully addressable multiple message handling in microprocessor-based systems.

Feature Summary

• Direct analog storage into non-volatile multilevel Flash memory without digitization or compression
• Integrated AutoMute feature for background noise attenuation during silence periods
• SPI serial interface for microcontroller control and fully addressable message management
• On-chip clock source with optional external clock input for precise timing

Applications

• Cellular phones and portable communication devices
• Multiple message greeting systems
• Voice prompts in consumer electronics
• Industrial control voice alerts

Procurement Notes

Verify the specific suffix SY corresponds to the SOIC package and commercial temperature range as defined in the ordering information section of the datasheet. Confirm that the 180-second duration variant matches the system's memory requirements. Check for any recent Product Change Notices regarding packaging or material composition updates.

Selection Notes

Select this model when 180 seconds of audio time is required. Note that the 5.3 kHz sampling rate results in a filter pass band of 2.3 kHz, which is narrower than higher-speed variants. Ensure the host system supports the SPI protocol and can provide the necessary 3V supply voltage. Consider the industrial temperature range option if operation outside 0°C to +70°C is needed.

Part Context

The ISD4002-180SY belongs to the ISD4002 ChipCorder series, which offers durations of 120, 150, 180, and 240 seconds. All variants share the same architecture, including the 960K Flash cell array and SPI interface. The primary difference lies in the sampling frequency and resulting audio bandwidth, which are fixed by the factory configuration or external clock input.

Replacement Considerations

The ISD4002-150FYI is listed as a manufacturer-recommended alternative in distributor databases, though it offers 150 seconds of duration. Verify pin compatibility and software register settings when substituting between different duration variants within the ISD4002 family.

FAQ

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

If an external clock is used for greater precision, the recommended frequency is 682.7 kHz.

How does the AutoMute feature function?

The AutoMute feature attenuates background noise by 6 dB during periods of silence. It uses a peak detector circuit connected to the AM CAP pin to compare signal amplitude against an internal threshold.

What is the maximum input signal level for optimal 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- should be 16 mVp-p.