mcp980x(4) - NetBSD Manual Pages

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MCP980X(4)              NetBSD Kernel Interfaces Manual             MCP980X(4)


NAME

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


SYNOPSIS

     mcp980x* at iic? addr 0x48


DESCRIPTION

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


SYSCTL VARIABLES

     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) res-
                                  olution.

     machdep.mcp980x0.templimit   If the ambient temperature exceeds this
                                  limit, the chip asserts an alert line (inte-
                                  ger).

     machdep.mcp980x0.hysteresis  Hysteresis for temperature limit (integer).


SEE ALSO

     envsys(4)


HISTORY

     The mcp980x device first appeared in NetBSD 7.0.


AUTHORS

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


CAVEATS

     MCP9804 and MCP9805 chip are different and are 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.

NetBSD 10.0                      July 26, 2016                     NetBSD 10.0