SDTEMP(4) | Device Drivers Manual | SDTEMP(4)

# NAME

`sdtemp` —
JEDEC JC-42.4 compatible memory module temperature sensors

# SYNOPSIS

`sdtemp* at iic? addr 0x18`
`sdtemp* at iic? addr 0x19`
`sdtemp* at iic? addr 0x1a`
`sdtemp* at iic? addr 0x1b`
`sdtemp* at iic? addr 0x1c`
`sdtemp* at iic? addr 0x1d`
`sdtemp* at iic? addr 0x1e`
`sdtemp* at iic? addr 0x1f`

# DESCRIPTION

The `sdtemp` driver provides support for the 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 newer DIMMs. Sensors provided by this driver, including the on-chip thresholds for the Alarm Window and Critical level, are accessed through the envsys(4) API.

The `sdtemp` supports temperature ranges from -256 to +255 degrees C.

Chips supported by the `sdtemp` driver include TSE2004av compliant devices and:

- Analog Devices ADT7408
- Atmel AT30TS00 and AT30TSE004
- On semiconductor (Catalyst) CAT34TS02, CAT34TS02C, CAT34TS04 and CAT6095
- Giantec Semiconductor GT30TS00 and GT34TS02
- Integrated Deviced Technology TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2, and TS30001GB2
- Maxim MAX6604
- Microchip Technology EMC1501, MCP9804, MCP9805, MCP9843, MCP98242, MCP98243, and MCP98244
- NXP Semiconductors SE97 and SE98
- STmicroelectronics STTS424, STTS424E, STTS2002, STTS2004, and STTS3000

# SEE ALSO

envsys(4), envstat(8)

# HISTORY

The `sdtemp` device appeared in NetBSD 6.0.

# BUGS

Interrupt support is unimplemented.

February 22, 2018 | NetBSD 9.0