ROHM BD79104 Analog to Digital Converter (ADC)

The ROHM BD79104 ADC is a 8-channel, 12-bit ADC which is controlled over SPI.

Resources

• Product page
• Datasheet

Linux Driver:

Source Code:

The ROHM Finland SWDC has created a Linux driver in collaboration with the Linux kernel community. Driver is included in the Upstream Linux from v6.16-rc1 onwards.

The driver supports reading the ADC channels via the Linux IIO subsystem. SPI MODE 3 (CPOL=1, CPHA=1) should be used.

Linux subsystem:

IIO (Industrial input/output)

Devicetree example:

    spi {
        adc: adc@0 {
            compatible = "rohm,bd79104";
            reg = <0>;
            vdd-supply = <&dummyreg>; 
            iovdd-supply = <&dummyreg>;
            spi-cpha;
            spi-cpol;
            spi-max-frequency = <20000000>;
        };
    }