ISD1964SYI01

Overview

The ISD1964SYI01 is a single-chip multiple-message record/playback device from the ISD1900 ChipCorder series. It supports dual operating modes: Address Mode and Direct Mode. The supply voltage ranges from 2.4V to 5.5V. Sampling frequency selection via an external resistor (Rosc) allows settings of 4 kHz, 5.3 kHz, 6.4 kHz, 8 kHz, or 12 kHz. At 8 kHz sampling rate, the maximum recording duration is 64 seconds. The device features differential microphone inputs with automatic gain control (AGC), feed-through mode, and Class-D PWM speaker drivers. It operates within a temperature range of -40°C to +85°C and is packaged in a 28-lead SOIC.

Feature Summary

• Dual operational modes including flexible address-based message definition and fixed direct-trigger access for up to eight messages.
• Integrated automatic gain control (AGC) for differential microphone input and selectable feed-through functionality.
• Direct-drive Class-D PWM speaker outputs capable of powering standard speakers or buzzers without external amplifiers.
• Automatic power-down mechanism after each operation cycle to minimize standby current consumption.

Applications

• Standalone voice messaging systems requiring simple hardware control
• Industrial equipment status announcements and alarm prompts
• Consumer electronic devices with voice feedback capabilities

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and pin alignment prior to integration. Ensure environmental conditions match specified industrial temperature ratings during storage and operation.

Selection Notes

Select this model when variable message durations are required using address pins or when fixed-duration random access is needed via direct mode configuration. Verify that the required recording time does not exceed the 64-second limit at 8 kHz sampling frequency. Ensure system voltage remains within the 2.4V to 5.5V operating range.

Part Context

This component belongs to the Nuvoton ISD1900 ChipCorder series, which provides single-chip solutions for voice recording and playback. The series includes variants with different memory capacities, such as ISD1916, ISD1932, and ISD1964, offering scalable recording times based on application requirements.

Replacement Considerations

ISD1964SYI01 is obsolete. Officially recommended substitutes include I2361YYI and I3800FYI from Nuvoton Technology Corporation. Verify pin compatibility and functional equivalence before substitution.

FAQ

How is the sampling frequency determined?

The sampling frequency is selected by connecting an external resistor between the Rosc pin and ground. Values range from 53.3 kΩ for 12 kHz to 160 kΩ for 4 kHz.

What is the difference between Address Mode and Direct Mode?

Address Mode uses start and end address pins to define flexible message durations. Direct Mode uses configuration pins to divide memory into up to eight equal-duration messages accessible via specific message control pins.

Can the device play audio while recording?

Yes, in Feed-Through mode, the analog input signal can be transmitted to the speaker outputs while simultaneously being recorded into memory if both FT and REC functions are active.