ISD1964SYI

Overview

The ISD1964SYI 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, 5.3, 6.4, 8, 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), a Class-D PWM speaker driver for direct drive, and feed-through mode capabilities.

Feature Summary

• Dual operational modes including flexible address-based message definition and fixed-duration direct trigger access.
• Integrated differential microphone preamplifier with automatic gain control and selectable analog input feed-through.
• Built-in Class-D PWM speaker driver capable of directly driving standard speakers or buzzers without external amplification.
• Automatic power-down functionality after each operation cycle to minimize standby current consumption.

Applications

• Standalone voice recording and playback modules
• Industrial equipment status alarms
• Consumer electronic voice prompts

Procurement Notes

Verify the specific suffix 'SYI' against the manufacturer's official ordering information to confirm package type and temperature grade. Ensure the component matches the required industrial temperature range if applicable. Cross-reference the datasheet revision date to confirm electrical characteristics remain consistent with your design specifications.

Selection Notes

Select this model when variable message durations are required using address pins or when up to eight equal-length messages are needed via direct trigger configuration. Consider the 8-ohm speaker load capability and the 2.4V to 5.5V operating voltage range. Evaluate the sampling frequency requirements against the available Rosc resistor values to determine the appropriate recording duration.

Part Context

This component belongs to the Nuvoton ISD1900 ChipCorder series, which includes variants like ISD1916 and ISD1932. These devices share similar architectural features but differ in memory capacity and resulting recording durations. The ISD1964 variant provides the highest storage capacity within this specific family line.

Replacement Considerations

ISD1932SYI

FAQ

How is the sampling frequency determined?

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

What is the function of the FT pin?

When held low, the FT pin enables feed-through mode, configuring the Mic+ pin as a single-ended analog input (AnaIn) that transmits the signal directly to the speaker outputs while allowing simultaneous recording.

How does the device handle abrupt power interruption?

It is strongly recommended not to interrupt supply power during operation, as doing so may cause the device to malfunction or become unreliable.