This is a board with a Yamaha YMF825 (SD-1) mounted on it. The SD-1 is a 4-operator, 16-voice polyphonic FM synthesizer chip. Its registers can be controlled directly by SPI. The board has a crystal unit. The chip has a DAC and an amplifier. You can generate sound by only manipulating the registers.
Features
- 3.5 mm Headphone jack
- 12.288MHz crystal unit
- YMF825 chipset
- Integrated loudspeaker driver
- Synchronous serial data link for host controller interface (SPI compatible)
- FM tone generator
- Integrated 3-band equalizer
- IOVDD（switching 5 V / 3.3 V）
Power Supply
- Single 5 V Power Supply Configuration
No changes to the schematic are necessary. Please connect the power supply to 5 V and GND. The 3.3 V terminal will not be used.
- Dual Power Supply(5 V/3.3 V) Configuration
Please connect a power supply to 3.3 V (separately from 5 V). Remove the R0 resistor. Short S1 with solder.
Specification
Terminal List
| Terminal Number / Function Name | Description |
|---|---|
| 0: SS | Slave Selection of Serial Interface (Chip Select) |
| 1: MOSI | Master Out, Slave In of Serial Interface, Input of YMF825Board |
| 2: MISO | Master In, Slave Out of Serial Interface, Output of YMF825Board |
| 3: SCK | Serial Interface Clock |
| 4: GND | Ground of referenced voltage |
| 5: 5 V | 5 V power supply input |
| 6: RST_N | Reset the YMF825. Can be left unconnected because the YMF85 has a power-on reset and a software reset function. |
| 7: AUDIO | LINE Output. Refer to the schematic. |
| 8: 3.3 V | 3.3 V power supply input. In the case of the dual power supply. |
Hardware Specification
| Item | Description |
|---|---|
| Speaker Output | 0.9 W/8Ω |
| Serial Interface | MAX 10 MHz |
| Vih | 0.8 x IOVDD |
| Vil | 0.2 x IOVDD |
| 5 V | 4.5 V～5.5 V |
| 3.3 V | 3.0 V～3.6 V |
| Operating temperature range | -20℃ -- 85℃ |
Documents
Category
|
|
| Name | YMF825Board Rev.A |
|---|---|
| Code | UDA-YMF825BOARD |
| SKU# | 3399 |
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