KT148A Sound Chip

KT148A Sound Chip

The KT148A sound chip is developed by Shenzhen Qingyue Electronics Co., Ltd. and is widely used in security, transportation, and other fields. The KT148A is a 32-bit DSP sound chip in a standard SOP8 package. It features a built-in 420KByte voice storage space, supporting a maximum voice length of 420 seconds, multi-segment voice playback, direct driving of a 0.5W speaker, and user-replaceable voice content.

Chinese Name: KT148A Sound Chip

Developer: Shenzhen Qingyue Electronics Co., Ltd.

Type: Voice Chip

Applications: Security, transportation, and related fields

1. Product Overview

The KT148A is a 32-bit DSP voice chip in a standard SOP8 package. It has a built-in 420KByte voice storage space, supporting up to 420 seconds of audio, multi-segment playback, direct driving of a 0.5W speaker, and allows users to replace voice content.

2. Product Advantages

1. Cost Reduction & Reprogrammability: Improved manufacturing processes lower costs while allowing repeated firmware updates.

2. User-Replaceable Voice Content: Voices can be easily updated via a computer using a serial port.

3. Ample Storage Space: The chip provides sufficient memory for voice data.

3. Product Features

1. 32-bit DSP voice chip, 5MHz internal oscillator, PLL up to 120MHz.

2. Operating voltage: 2.0–5.5V (Note: Hardware adjustments are required for voltages below 3.3V).

3. Standby power consumption <25μA, with an ultra-low power mode of 1.5μA.

4. 16-bit PWM output, capable of directly driving an 8Ω/0.5W speaker.

5. Includes a tool for converting audio formats.

6. Supports 200 seconds at 16KHz or 400 seconds at 8KHz.

7. Voice content can be updated via a PC tool through a serial port.

8. Supports single-wire serial port control.

9. Supports up to 224 addressable segments.

10. Hardware I²C and UART interfaces.

11. Supports repeated firmware updates.

4. Hardware Specifications

The chip adopts a System-on-Chip (SoC) design, integrating a 16-bit MCU and a dedicated audio-decoding aDSP. It uses hardware decoding to ensure system stability and sound quality. The compact package size allows easy integration into other products.

5. Usage Notes

1. Power Supply Recommendations:

- A 5V power supply is recommended for higher speaker driving power and louder output.

- For lithium battery (3.3–4.2V) applications, connect the positive terminal directly to Pin 8.

- For dry battery applications, also connect the positive terminal directly to Pin 8.

- For ultra-low voltage (2–3V, e.g., coin cell) applications, short Pin 7 and Pin 8, then connect to the positive terminal.

6. Testing Instructions

The chip's Pin 4 is the test pin. Triggering it to ground (via a button or tweezers) will play the next voice segment.

After connecting the speaker and powering the chip, use Pin 4 to test playback by grounding it.

Tags: Sound Chip, Voice Chip, Audio Chip