ISD4002-150SI

Overview

The ISD4002-150SI is a single-chip voice record/playback device from the ISD4002 ChipCorder series, manufactured by Nuvoton Technology Corporation. It provides 150 seconds of recording duration at a sampling frequency of 6.4 kHz with a typical filter passband of 2.7 kHz. The component operates on a single 3-volt supply (2.7 V to 3.3 V) and features an SPI interface for microcontroller control. It utilizes non-volatile multilevel Flash memory for message storage and includes an AutoMute feature for noise attenuation. The device is housed in a 28-SOIC package.

Feature Summary

• Direct analog storage using multilevel Flash memory for high-quality voice reproduction without digitization or compression.
• SPI serial interface allows fully addressable multiple message handling and control via microcontroller.
• AutoMute feature minimizes background noise during silence periods through signal amplitude detection.

Applications

• Cellular phones and portable messaging devices
• Microprocessor-based systems requiring voice prompts
• Industrial control systems with speech feedback

Procurement Notes

Verify the specific suffix 'SI' against official datasheets to confirm the SOIC package and temperature range. Confirm RoHS compliance status as historical data indicates variations within the series. Check for end-of-life notices or manufacturer recommended replacements if current production availability is required.

Selection Notes

Select this model when 150 seconds of audio duration is required. Ensure the system supports SPI communication and can provide the necessary 3V supply. Consider the 6.4 kHz sampling rate for the balance between voice quality and storage time compared to other series variants.

Part Context

The ISD4002-150SI belongs to the ISD4002 series, which offers durations of 120, 150, 180, and 240 seconds. These devices are designed for low-power, single-chip voice applications. The series uses patented multilevel storage technology to store analog signals directly in Flash memory.

Replacement Considerations

Nuvoton recommends the I3900FYI as a replacement part. Verify pin compatibility and electrical specifications before substitution.

FAQ

How does the AutoMute feature function?

The AutoMute feature attenuates background noise by 6 dB during 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 voltage for analog recording?

In single-ended mode, the maximum input signal is 32 mVp-p. In differential mode, the maximum input signal is 16 mVp-p for optimal signal quality.

Can the device be used for playback-only applications?

Yes, the ISD4002 series is ideal for playback-only applications where messages are controlled through the SPI port. Duplicates can be generated via a programmer once the configuration is set.