ISD4002-120SYI

Overview

The ISD4002-120SYI is a single-chip voice record and playback solution from the ISD4002 ChipCorder series, manufactured by Nuvoton Technology Corporation. It provides 120 seconds of recording duration at an 8.0 kHz sampling frequency with a typical filter passband of 3.4 kHz. The device operates on a single 3-volt supply (2.7 V to 3.3 V) and features low-power consumption, including a standby current of 1 µA. It utilizes an SPI interface for control and includes an on-chip oscillator, anti-aliasing filter, smoothing filter, AutoMute feature, audio amplifier, and high-density multilevel Flash memory array. The component is housed in a 28-lead SOIC package.

Feature Summary

• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• AutoMute feature minimizes background noise during silence periods through internal peak detection.
• Non-volatile Flash memory ensures zero-power message retention for up to 100 years.

Applications

• Cellular phones and portable messaging devices
• Microcontroller-based systems requiring addressable multi-message playback
• Industrial or commercial applications utilizing SPI-controlled voice prompts

Procurement Notes

Verify the specific suffix 'I' indicates industrial temperature range (-40°C to +85°C) compared to commercial variants. Confirm RoHS compliance status as datasheet notes lead-free packaging but does not explicitly guarantee RoHS3 for all suffixes without separate certification documents. Check for End-of-Life notices as the ISD4002 series has been subject to PCN announcements.

Selection Notes

Select this model for applications requiring exactly 120 seconds of recording time at 8 kHz sampling rate. Ensure the system supports SPI communication and can provide the required 3V supply. Consider the industrial temperature rating if the operating environment exceeds standard commercial limits. Verify that the 28-SOIC package footprint matches the PCB design constraints.

Part Context

The ISD4002-120SYI belongs to the ISD4002 ChipCorder series, which offers durations ranging from 120 to 240 seconds. This specific part number denotes the 120-second variant with industrial temperature grading and SOIC packaging. It shares the same core architecture and SPI interface as other members like the ISD4002-150 or ISD4002-240, differing primarily in memory allocation and sampling rate settings.

Replacement Considerations

The manufacturer recommends the I3900FYI as a replacement for discontinued ISD4002 parts. Verify functional compatibility regarding pinout, voltage levels, and SPI protocol before substitution. Note that the I3900FYI may have different duration or performance characteristics.

FAQ

How is the AutoMute feature configured?

The AutoMute feature is enabled by connecting a 1 µF capacitor to ground on the AM CAP pin. Connecting this pin directly to VCCA disables the feature.

What is the recommended input signal level for optimal quality?

For single-ended input mode, a maximum of 32 mVp-p should be capacitively coupled to ANA IN+. For differential mode, the maximum is 16 mVp-p.

Can the device operate without an external clock?

Yes, the ISD4002-120 uses an internal oscillator centered at 8.0 kHz. However, for greater precision, an external clock of 1024 kHz can be applied to the XCLK pin.