Junluan Tsui
Published

MP148: Ultra-Low-Cost Voice Module for All Audio Solutions

Add voice to any project! 0.5W speaker drive, 25µA standby, serial reprogramming—no tools needed. Perfect for IoT, toys, and alarms.

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MP148: Ultra-Low-Cost Voice Module for All Audio Solutions

Things used in this project

Hardware components

Capacitor 1μF 0603
×2
resistor 1k ohm 0603
×2
BUTTON
×2
KT148A Test board, blank borad,DIY soldier
×1
Sound Chip KT148A
×1

Software apps and online services

UartAssist V5.0.10

Hand tools and fabrication machines

Keil

Story

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Schematics

MP148 Voice Module Reference Schematic_V4

Notes:
1. The supply voltage should be a maximum of 5.2V and a minimum of 2.0V. Pin 8 of the chip is the power input.
2. If using a lithium battery for power supply, connect the power directly to Pin 8 (VBAT).
3. For downloading voice, connect Pin 2 to the RX pin of a USB-to-TTL converter.

Power Supply Voltage [2.0V--3.5V]: VBAT and VDDIO should be shorted.
Power Supply Voltage [3.5V~5V]: VBAT and VDDIO must be connected separately

1. Connect PB1 directly to the MCU,
with a 1K resistor in series.
2. The chip operates at 3.3V TTL level.

Short Pin 5 to ground during power-up to enter the voice download mode.

Code

MP148 Serial Port UART Communication One-wire data transmission

C#
The overall communication logic is as follows:
1. First, pull the data line DATA, also known as ONELINE, low for 6ms, then send 8 bits of data, starting with the least significant bit (LSB) and then the most significant bit (MSB).
2. Use the ratio of high and low levels to represent the value of each data bit.
3. It is recommended to use 200us:600us. The value ranges are: narrow pulse = [150us--400us], wide pulse = [500us--1000us].

[Note: When debugging, use an oscilloscope or logic analyzer to check the pulse width]
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Credits

Junluan Tsui
3 projects • 1 follower
Devoted to the research and development of products or projects related to Bluetooth chips, Bluetooth modules,voice chips,and voice modules.

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