ISD4002-180SIR

Overview

The ISD4002-180SIR is a single-chip voice record/playback device from the ISD4002 series, manufactured by Nuvoton Technology Corporation. It provides an 180-second recording duration at a typical sampling frequency of 5.3 kHz. The device operates on a single 3-volt supply and features low-power consumption with a standby current of 1 µA (typical). It utilizes non-volatile multilevel Flash memory for message storage, supporting 100K record cycles and 100-year retention. Control is managed via a Serial Peripheral Interface (SPI) or Microwire interface.

Feature Summary

• Single-chip solution integrating analog transceivers, filters, audio amplifier, and high-density Flash memory.
• Direct analog storage of voice signals without digitization or compression algorithms.
• AutoMute feature for background noise attenuation during playback silence periods.
• Fully addressable memory architecture allowing multiple message handling.

Applications

• Cellular phones and portable messaging devices
• Microcontroller-based systems requiring voice prompts
• Industrial control panels with status announcements

Procurement Notes

Verify the specific suffix 'SIR' against official datasheets to confirm package type and temperature rating. Ensure the ordering information matches the manufacturer's current production status. Confirm that the SPI interface voltage levels are compatible with the host microcontroller logic.

Selection Notes

Select this model when a fixed 180-second duration at 5.3 kHz sampling rate is required. Compare against ISD4002-120, -150, and -240 variants if different durations or sampling frequencies better suit the application bandwidth and quality needs. Consider the industrial temperature range implied by the suffix if operating in harsh environments.

Part Context

The ISD4002 series represents Winbond's ChipCorder technology, designed for direct analog storage. This series eliminates the need for external DSPs or complex codecs. The ISD4002-180 variant specifically targets applications needing moderate recording time with balanced audio fidelity.

Replacement Considerations

ISD4002-150: Offers 150 seconds duration at 6.4 kHz sampling rate. ISD4002-240: Provides 240 seconds duration at 4.0 kHz sampling rate. ISD4002-120: Delivers 120 seconds duration at 8.0 kHz sampling rate. All share identical pinouts and SPI interfaces.

FAQ

How is the AutoMute feature configured?

Connect a 1 µF capacitor from the AM CAP pin to ground to enable automatic noise attenuation during silence. Connecting AM CAP directly to VCCA disables the feature.

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

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

How does the device handle end-of-message detection?

The INT pin goes LOW when an End of Message (EOM) marker is detected during playback. The interrupt status can be read via the RINT instruction over the SPI interface.