.\"	$NetBSD: sdtemp.4,v 1.1 2009/05/09 15:04:25 pgoyette Exp $
.\"
.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
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.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Paul Goyette.
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.Dd May 9, 2009
.Dt SDTEMP 4
.Os
.Sh NAME
.Nm sdtemp
.Nd Microchip Technology MCP9805/98242 and compatible memory module
temperature sensors
.Sh SYNOPSIS
.Cd "sdtemp0 at iic? addr 0x18"
.Sh DESCRIPTION
The
.Nm
driver provides support for the
.Tn Microchip Technology
MCP9805/98242 and other chips that conform to JEDEC Standard 21-C section
4.7.
Memory module temperature sensors are optional on DDR2 and DDR3 SDRAM DIMMs.
Sensors provided by this driver are accessed through the
.Xr envsys 4
API.
The on-chip thresholds for the Alarm Window and Critical level are
accessed through the
.Xr sysctl 8
utility.
.Pp
The
.Nm
supports temperature ranges from -256 to +255 degrees C.
.Sh HARDWARE
Chips supported by the
.Nm
driver include:
.Pp
.Bl -item -offset indent
.It
.Tn Microchip Technology
.Em MCP9805
.It
.Tn Microchip Technology
.Em MCP98242
.It
.Tn Analog Devices
.Em ADT7408
.It
.Tn NXP Semiconductors
.Em SE97
.It
.Tn NXP Semiconductors
.Em SE98
.It
.Tn STmicroelectronics
.Em STTS424E02-DA/DN
.It
.Tn Catalyst
.Em CAT34TS02
.It
.Tn Catalyst
.Em CAT6095
.El
.Sh SEE ALSO
.Xr envsys 4 ,
.Xr envstat 8 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
device appeared in
.Nx 6.0 .
.Sh BUGS
Interrupt support is unimplemented.