ISD18B12X

Overview

The ISD18B12X is a single-chip voice recording and playback device from the ISD18B00 series, utilizing Nuvoton's Multi-Level Storage technology to store audio signals directly in on-chip non-volatile memory. It operates within a voltage range of 2.4V to 5.5V and supports an operating temperature of 0°C to +50°C. The sampling frequency is user-selectable between 4 kHz and 8 kHz via an external resistor at the Rosc pin, resulting in a record duration of 6 to 12 seconds for this specific model. Key electrical parameters include a typical standby current of 1 µA, record/playback currents of 15 mA, and differential speaker outputs capable of driving an 8 Ω load.

Feature Summary

• Supports multiple trigger modes including level-triggered and edge-triggered record and playback operations.
• Features a special TryMe mode that automatically records, plays back once, and then erases the message upon trigger.
• Includes a feed-through function allowing microphone input to be transmitted directly to speaker outputs while remaining active during recording.
• Provides LED output indicators for recording and playback states, along with optional sound effect beep generation.

Applications

• Voice messaging systems
• Security alarm announcements
• Automated industrial prompts

Procurement Notes

Verify the ordering number I18B12X matches the required 6 to 12-second duration specification. Confirm the package type is DIE as listed in the official documentation. Ensure the application environment remains within the specified 0°C to +50°C operating temperature range. Check that power supply decoupling follows recommended audio design practices to maintain signal integrity.

Selection Notes

Select the ISD18B12X when a fixed duration of up to 12 seconds is sufficient for the application. Choose this component over the ISD18B24X if shorter message lengths are required. Consider the external resistor requirements for setting the desired sampling frequency and duration. Evaluate the need for the TryMe feature or feed-through capability before finalizing the design.

Part Context

The ISD18B12X belongs to the ISD18B00 ChipCorder series, which also includes the ISD18B24X offering longer durations. Both models share identical core functionalities, control interfaces, and electrical characteristics, differing primarily in their maximum storage capacity and resulting record time. They are designed for simple, low-power voice applications requiring direct analog-to-memory storage without digital processing.

Replacement Considerations

The ISD18B24X serves as a direct functional substitute if extended recording duration up to 24 seconds is needed. Both parts share the same pinout and operational logic. Verify that the system timing constraints accommodate the potentially different debounce and delay times associated with varying sampling frequencies.