MCP980X(4) Device Drivers Manual MCP980X(4)

mcp980x
Microchip 9800/1/2/3 I2C temperature sensor driver

mcp980x* at iic? addr 0x48

The mcp980x driver provides support for the MCP980x series of temperature sensors. It allows reporting ambient temperature through the envsys(4) API.

The following sysctl(3) variable are provided:
machdep.mcp980x0.res
ADC resolution (integer). Valid values are 0-3, where 0 is 9-bit (0.5 Celsius degree) and 3 is 12-bit (0.0625 Celsius degree) resolution.
machdep.mcp980x0.templimit
If the ambient temperature exceeds this limit, the chip asserts an alert line (integer).
machdep.mcp980x0.hysteresis
Hysteresis for temperature limit (integer).

envsys(4)

The mcp980x device first appeared in NetBSD 7.0.

The mcp980x driver was written by Radoslaw Kujawa <radoslaw.kujawa@gmail.com>.

MCP9804 and MCP9805 chip are different and is supported by the sdtemp(4) driver.

The MCP980x chip supports hysteresis and temperature limit values with a resolution of 0.5 Celsius degree, however the mcp980x driver supports setting only integer values.

July 26, 2016 NetBSD 9.4