1.\" 2.\" This file and its contents are supplied under the terms of the 3.\" Common Development and Distribution License ("CDDL"), version 1.0. 4.\" You may only use this file in accordance with the terms of version 5.\" 1.0 of the CDDL. 6.\" 7.\" A full copy of the text of the CDDL should have accompanied this 8.\" source. A copy of the CDDL is also available via the Internet at 9.\" http://www.illumos.org/license/CDDL. 10.\" 11.\" 12.\" Copyright 2025 Oxide Computer Company 13.\" 14.Dd September 21, 2025 15.Dt TS511X 4D 16.Os 17.Sh NAME 18.Nm ts511x 19.Nd DDR5 temperature sensor driver 20.Sh SYNOPSIS 21.Pa /dev/sensors/temperature/i2c/ts511x* 22.Sh DESCRIPTION 23The 24.Nm 25driver provides support for the discrete DDR5 thermal sensor I2C device 26based on JEDEC standard JESD302-1A including the part numbers TS5110, 27TS5111, TS5210, and TS5211. 28DIMMs may have up to two such sensors present on them. 29The first can be found at addresses 0x10 through 0x17 and the second may 30be found at addresses 0x30 through 0x37. 31.Pp 32The temperature sensor measures in units of 0.25 degrees Celsius and its 33accuracy varies depending on the current temperature range. 34Access to the thermal sensor is provided through the 35.Xr ksensor 4D 36driver and kernel framework. 37Temperature information is available to the system through the fault 38management architecture 39.Pq FMA . 40The file system location and programming interface to the 41.Nm 42temperature sensors are considered 43.Sy volatile . 44.Pp 45DDR5 modules have an additional temperature sensor commonly found in 46their hub. 47That is supported by the 48.Xr spd511x 4D 49driver. 50.Sh FILES 51.Bl -tag -width Pa 52.It Pa /dev/sensors/temperature/i2c/spd511x* 53Temperature sensor character device file. 54.It Pa /kernel/drv/amd64/ts511x 55Device driver (x86) 56.El 57.Sh SEE ALSO 58.Xr spd511x 4D , 59.Xr i2cadm 8 60.Rs 61.%Q JEDEC Solid State Technology Association 62.%T TS511X, TS521X Serial Bus Thermal Sensor Device Standard 63.%N JESD302-1A Revision 2.00 64.%D August 2023 65.Re 66