ISD17120EY

Overview

The ISD17120EY is a single-chip voice record and playback device from the Nuvoton ISD1700 ChipCorder series. It features Multi-Level Storage (MLS) technology for direct solid-state audio storage without compression. The device supports selectable sampling frequencies from 4 kHz to 12 kHz via an external resistor, enabling message durations up to 120 seconds at 8 kHz. Operating voltage ranges from 2.4 V to 5.5 V. It includes a differential microphone input with Automatic Gain Control (AGC), an auxiliary analog input, and dual outputs: a PWM Class D speaker driver and a configurable analog output. The chip operates in standalone push-button mode or SPI mode for microcontroller control.

Feature Summary

• Integrated message management system allowing self-managed address locations for multiple messages in standalone mode.
• Dual operating modes supporting simple push-button interaction or full user control via a 4-wire serial interface.
• On-chip oscillator with external resistor control for adjustable sampling frequency and recording duration.
• Automatic power-down capability after each operation cycle to conserve energy in battery-powered applications.

Applications

• Electronic systems requiring high-quality voice messaging
• Battery-operated devices needing low standby current
• Industrial equipment with voice alert functions

Procurement Notes

Verify the specific suffix of the part number against the manufacturer's ordering information table to confirm package type and temperature grade. Ensure the selected variant matches the required operating environment and physical footprint constraints for the target design.

Selection Notes

Select the appropriate sampling frequency based on the desired balance between audio quality and recording duration. Consider the power supply range and whether standalone or SPI control best fits the system architecture. Evaluate the need for external amplification if driving loads beyond the integrated speaker driver capabilities.

Part Context

The ISD17120EY belongs to the ISD1700 series, which utilizes patented Multi-Level Storage technology. This series is designed for applications requiring reliable, uncompressed voice storage with minimal external components. The family offers flexibility through various sampling rates and message durations.

Replacement Considerations

Check the ISD1700 datasheet ordering information for compatible variants with different message durations or packaging options. Verify pin compatibility and electrical characteristics before substituting with other members of the ISD1700 family.

FAQ

How is the sampling frequency determined?

The sampling frequency is set by connecting an external resistor to the ROSC pin. Different resistance values correspond to specific frequencies ranging from 4 kHz to 12 kHz.

What happens to recorded messages when power is removed?

Recordings are stored in on-chip Flash memory using Multi-Level Storage technology, providing zero-power message retention without the need for a backup battery.

Can the device drive a speaker directly?

Yes, the ISD17120EY includes a Pulse Width Modulation (PWM) Class D speaker driver that can directly drive an 8 Ω speaker or a typical buzzer.