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PCFADC(4) Device Drivers Manual PCFADC(4)

pcfadcPhilips PCF8591 temperature sensor

pcfadc* at iic?

The pcfadc driver supports the PCF8591 I2C analog to digital converter, making its readings available through a sysctl(8) interface.

The driver reads up to four A/D lines configured as temperature inputs. Sensor names, type and calibration information are read from OpenFirmware.

iic(4), intro(4), sensorsd(8), sysctl(8)

The pcfadc driver first appeared in OpenBSD 3.9.

The pcfadc driver was written by Damien Miller <>.

July 16, 2013 OpenBSD-7.0