Si4713-based stereo FM transmitter breakout with I2C control, line-level stereo audio input, and RDS/RBDS text transmission. Transmits up to ~10 m; tune frequency and station metadata from any Arduino or microcontroller.
Line-level left audio input; also connected to the headphone jack, with onboard AC blocking capacitor.
Line-level right audio input; same role as LIN for the right channel.
Power input for the breakout and Si4713 chip.
Power and logic ground, connect to the microcontroller ground.
Output from the onboard regulator for external 3.3V use.
Reset input; must be toggled before communicating with the chip, logic 0 holds reset.
SPI chip-select input; also selects the I2C address, default high gives 0x63 and grounded gives 0x11.
I2C clock line, connect to microcontroller SCL.
I2C data line, connect to microcontroller SDA.
Extra GPIO output pin number 1; initial state helps set analogue mode, so do not short to ground or VCC during reset.
Extra GPIO output pin number 2; initial state helps set analogue mode, so do not short to ground or VCC during reset.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| LIN | Analog | Line-level left audio input; also connected to the headphone jack, with onboard AC blocking capacitor. | about 0.7 Vpp line-level audio per Adafruit Learn |
| RIN | Analog | Line-level right audio input; same role as LIN for the right channel. | about 0.7 Vpp line-level audio per Adafruit Learn |
| Vin | Power | Power input for the breakout and Si4713 chip. | 3-5V DC per Adafruit Learn |
| GND | Ground | Power and logic ground, connect to the microcontroller ground. | 0V / common ground |
| 3Vo | Power | Output from the onboard regulator for external 3.3V use. | 3.3V nominal, up to 100mA per Adafruit Learn |
| RST | Control | Reset input; must be toggled before communicating with the chip, logic 0 holds reset. | 3-5V logic compatible input per Adafruit Learn |
| CS | SPI | SPI chip-select input; also selects the I2C address, default high gives 0x63 and grounded gives 0x11. | 3-5V logic compatible input per Adafruit Learn |
| SCL | I2C | I2C clock line, connect to microcontroller SCL. | 3-5V logic compatible input per Adafruit Learn |
| SDA | I2C | I2C data line, connect to microcontroller SDA. | 3-5V logic compatible input per Adafruit Learn |
| GP1 | GPIO | Extra GPIO output pin number 1; initial state helps set analogue mode, so do not short to ground or VCC during reset. | 3V output only per Adafruit Learn |
| GP2 | GPIO | Extra GPIO output pin number 2; initial state helps set analogue mode, so do not short to ground or VCC during reset. | 3V output only per Adafruit Learn |
Line-level left audio input; also connected to the headphone jack, with onboard AC blocking capacitor.
Line-level right audio input; same role as LIN for the right channel.
Power input for the breakout and Si4713 chip.
Power and logic ground, connect to the microcontroller ground.
Output from the onboard regulator for external 3.3V use.
Reset input; must be toggled before communicating with the chip, logic 0 holds reset.
SPI chip-select input; also selects the I2C address, default high gives 0x63 and grounded gives 0x11.
I2C clock line, connect to microcontroller SCL.
I2C data line, connect to microcontroller SDA.
Extra GPIO output pin number 1; initial state helps set analogue mode, so do not short to ground or VCC during reset.
Extra GPIO output pin number 2; initial state helps set analogue mode, so do not short to ground or VCC during reset.
UART · SPI · 3.3 V · Breakout
Confirm the data interface matches your host board.
Module pins: Vin, 3Vo, GND, LIN, RIN, SCL, SDA, GP1. Schematik maps them to your board in the app.
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