ISD1750SYI01

Overview

The ISD1750SYI01 is a multi-message single-chip voice record and playback device from the Nuvoton ISD1700 ChipCorder series. It features user-selectable message durations ranging from 33 to 100 seconds, determined by an external oscillator resistor that sets the sampling frequency between 4 kHz and 12 kHz. The device operates on a supply voltage of 2.4 V to 5.5 V and supports both standalone push-button and SPI microcontroller modes. It includes an internal oscillator, microphone preamplifier with Automatic Gain Control (AGC), Multi-Level Storage (MLS) array, and a PWM Class D speaker driver. The component is housed in a 28-SOIC package and supports industrial operating temperatures from -40°C to +85°C.

Feature Summary

• Integrated message management system allowing self-managed address locations for multiple messages without external control logic.
• Dual operating modes supporting simple standalone push-button operation or full microcontroller control via SPI interface.
• Non-volatile message storage using patented Multi-Level Storage (MLS) technology for direct audio data retention without digital compression.
• Built-in Automatic Gain Control (AGC) for microphone preamplification and Pulse Width Modulation (PWM) Class D speaker driver.

Applications

• Electronic systems requiring high-quality voice prompts or announcements
• Standalone push-button messaging devices
• Microcontroller-integrated voice recording and playback modules

Procurement Notes

Verify component status as the ISD1750SYI01 has been officially discontinued. Confirm availability of recommended replacement parts such as the I2361YYI or I3800FYI from Nuvoton Technology Corporation. Ensure design updates accommodate any pinout or functional differences in substitute components before finalizing procurement plans.

Selection Notes

Select this component when specific duration requirements between 33 and 100 seconds are needed at variable sampling frequencies. The ISD1750SYI01 is suitable for applications requiring either autonomous button-controlled operation or precise SPI-based command sequencing. Consider the 28-SOIC package constraints and industrial temperature range specifications during hardware design.

Part Context

This part belongs to the ISD1700 ChipCorder series, which provides fully integrated single-chip solutions for voice recording and playback. The series utilizes proprietary MLS technology to store audio directly in solid-state memory. Other models in the family offer different duration ranges, such as the ISD1730 for shorter messages or the ISD1790 for longer recordings, all sharing similar operational architectures.

Replacement Considerations

Official manufacturer-recommended substitutes include the I2361YYI and I3800FYI. Verify compatibility regarding message duration, sampling frequency capabilities, and package dimensions when transitioning to these alternative part numbers.

FAQ

How is the sampling frequency adjusted on the ISD1750SYI01?

The sampling frequency, which ranges from 4 kHz to 12 kHz, is adjusted by connecting an external resistor to the ROSC pin. This resistor value also determines the total message duration.

What input options are available for recording audio?

The device supports two independent input paths: a differential microphone input (MIC+/MIC-) with Automatic Gain Control and a single-ended auxiliary analog input (AnaIn).

Can the ISD1750SYI01 operate without a microcontroller?

Yes, it supports a Standalone (Push-Button) mode where operations like record, play, erase, and forward are initiated directly via physical buttons, automatically entering power-down mode after each cycle.