ISD4002-180P

Overview

The ISD4002-180P is a single-chip voice record/playback device from the ISD4002 series, designed for portable applications. It provides 180 seconds of 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 standby current typically at 1 µA. It utilizes non-volatile multilevel Flash memory for message storage, supporting 100K record cycles and 100-year retention. Control is managed via SPI or Microwire interfaces.

Feature Summary

• Direct analog storage into non-volatile Flash memory without digitization or compression
• Integrated AutoMute feature for background noise attenuation during silence
• Fully addressable architecture allowing multiple message handling
• On-chip oscillator and filters eliminating external component requirements

Applications

• Cellular phones and portable messaging devices
• Microcontroller-based systems requiring voice prompts
• Automotive and industrial environments using extended temperature variants

Procurement Notes

Verify the specific package type required, as the ISD4002 series is available in PDIP, SOIC, and TSOP formats. Confirm the operating temperature range matches the application environment, selecting between commercial, extended, or industrial grades. Ensure the system voltage aligns with the +2.7V to +3.3V specification. Check for any ordering suffixes that might indicate die form or specific packaging variations.

Selection Notes

Select the ISD4002-180P when 180 seconds of audio duration is required. Consider the 5.3 kHz sampling rate and 2.3 kHz filter passband for speech quality needs. Evaluate power constraints against the 15 mA playback and 25 mA record currents. If higher precision clocking is needed, utilize the XCLK pin with an external source rather than relying on the internal oscillator tolerances.

Part Context

This component belongs to the ISD4002 ChipCorder series, which includes models with 120, 150, 180, and 240-second durations. The series uses Winbond's patented multilevel storage technology to store voice signals directly in their natural form. It is designed to interface with microprocessors via serial interfaces to minimize pin count.

Replacement Considerations

Other models within the ISD4002 series (ISD4002-120, ISD4002-150, ISD4002-240) share identical pinouts and control protocols but offer different recording durations and sampling frequencies. Substitution requires verifying that the alternative duration meets the application's time requirements.

FAQ

How does the AutoMute feature function?

The AutoMute feature minimizes background noise by attenuating the signal 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 recommended input signal level for optimal quality?

In single-ended mode, a maximum of 32 mVp-p should be capacitively coupled to ANA IN+. In differential mode, the maximum input signal at both ANA IN+ and ANA IN- should be 16 mVp-p.

Can the device operate without a microcontroller?

No, the ISD4002 series is designed to be used in a microprocessor- or microcontroller-based system. Address and control are accomplished through the Serial Peripheral Interface (SPI) or Microwire Serial Interface.