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+.\" $NetBSD: mcp980x.4,v 1.7 2020/06/14 22:30:44 rkujawa Exp $
+.\"
+.\" Copyright (c) 2013 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Radoslaw Kujawa.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 26, 2016
+.Dt MCP980X 4
+.Os
+.Sh NAME
+.Nm mcp980x
+.Nd Microchip 9800/1/2/3 I2C temperature sensor driver
+.Sh SYNOPSIS
+.Cd "mcp980x* at iic? addr 0x48"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the MCP980x series of temperature sensors.
+It allows reporting ambient temperature through the
+.Xr envsys 4
+API.
+.Sh SYSCTL VARIABLES
+The following
+.Xr sysctl 3
+variable are provided:
+.Bl -tag -width machdep.mcp980x0.hysteresis
+.It Va 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.
+.It Va machdep.mcp980x0.templimit
+If the ambient temperature exceeds this limit, the chip asserts an alert line
+(integer).
+.It Va machdep.mcp980x0.hysteresis
+Hysteresis for temperature limit (integer).
+.El
+.Sh SEE ALSO
+.Xr envsys 4
+.Sh HISTORY
+The
+.Nm
+device first appeared in
+.Nx 7.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com .
+.Sh CAVEATS
+MCP9804 and MCP9805 chip are different and are supported by the
+.Xr sdtemp 4
+driver.
+.Pp
+The MCP980x chip supports hysteresis and temperature limit values with a
+resolution of 0.5 Celsius degree, however the
+.Nm
+driver supports setting only integer values.