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).
The mcp980x
device first appeared in
NetBSD 7.0.
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.