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The product is a voice playback module consisting of a breakout board and the BM72D3041-1 voice playback module, designed for easy evaluation. Additionally, we provide two development platforms: BMduino Voice Widget and Voice MCU Workshop. These platforms simplify the process—just configure the voices and program the MCU via the SPI interface.
| Pin | Name | Function |
|---|---|---|
| SPI interface | ||
| 1 | VDD3 | Power supply: 3.0V~5.5V |
| 2 | DATA
MISO1 |
⬥ One-wire: data line (playback)
⬥ SPI: master input and slave output data line (voice update) |
| 3 | MOSI1 | SPI: master output and slave input data line (voice update) |
| 4 | BUSY
SCLK1 |
⬥One-wire: outputs low level when playing voices
⬥ SPI: clock line (voice update) |
| 5 | GND | Ground |
| 6 | LED
CS1 |
⬥ LED status control
⬥ SPI: slave select line (voice update) |
| BMCOM1 | ||
| 7 & 8 & 25 | PWCTL
STA1 |
⬥ Power control pin (power on/off)
⬥ BMCOM1: STATUS1 pin |
| 9 & 10 & 26 | TX1/SCL1 | BMCOM1: TX1/SCL1 pin |
| 11 & 12 & 27 | RX1/SDA1 | BMCOM1: RX1/SDA1 pin |
| 13 & 14 & 28 | VDD1 | BMCOM1: VDD1 pin |
| 15 & 16 & 29 | GND | BMCOM1: GND pin |
| BM72D3041-1 pin | ||
| 17 | MOSI | SPI: master output and slave input data line (voice update) |
| 18 | BUSY
SCLK |
⬥ One-wire: outputs low level when playing voices
⬥ SPI: clock line (voice update) |
| 19 | DATA
MISO |
⬥ One-wire: data line (playback)
⬥ SPI: master input and slave output data line (voice update) |
| 20 | GND | Ground |
| 21 | VDD | Positive power |
| 22 | LED
CS |
⬥ LED status control
⬥ SPI: slave select line (voice update) |
| Speaker interface | ||
| 23 | PWM2 | Connect to negative of the speaker |
| 24 | PWM1 | Connect to positive of the speaker |
Voice Workshop is the development platform for Holtek voice MCUs, using a simple graphical user interface and allowing users to develop their projects easily.
