LMTEMP(4)

📦
version 11.0 · 2 versions
, in nixpkgs unstable

💖 LMTEMP(4) 💖

okay so bestie, this page is from the Kernel Interfaces Manual and it's literally all about lmtemp — the National Semiconductor LM75, LM77 and compatible hardware monitors ✨ no cap, they're temperature sensors and they're kind of iconic.

🌸 NAME 🌸

lmtemp — National Semiconductor LM75, LM77 and compatible hardware monitors 🫶

✨ SYNOPSIS ✨

lmtemp0 at iic? addr 0x48 flags 0x0000

💅 DESCRIPTION 💅

The lmtemp driver provides support for the National Semiconductor LM on iicbus series temperature sensors and register compatible chips. so basically the whole friend group 💜

Each device is specified by the value of the address and flags 👑

  • LM75 — addr 0x48 - 0x4f, flags 0x0000
  • LM75A — addr 0x48 - 0x4f, flags 0x0000
  • DS75 — addr 0x48 - 0x4f, flags 0x0001
  • LM77 — addr 0x48 - 0x4b, flags 0x0002

🔥 HARDWARE 🔥

Chips supported by the lmtemp driver include:

  • National Semiconductor LM75 — Range -55 – +125, Resolution 0.5 degC
  • Texas Instruments LM75A — Range -55 – +125, Resolution 0.5 degC
  • Dallas Semiconductor DS75 — Range -55 – +125, Resolution 0.0625 degC
  • National Semiconductor LM77 — Range -55 – +130, Resolution 0.5 degC

The LM75, LM75A, and DS75 have a programmable high temperature limit 🌡️ When this is exceeded, the device asserts an over-temperature output. it's giving "we're so back" energy, but for alarms 💀

The LM77 has programmable low and high temperature limits. Exceeding either of these causes the device to assert an interrupt output 😭 It also has a programmable critical high temperature limit, and exceeding this causes the device to assert a separate critical alarm output. two alarms, main character energy fr fr 👑

The sensor and limit values are made available through the envstat(8) interface ✨

🎀 SEE ALSO 🎀

🦋 HISTORY 🦋

The lmtemp device appeared in NetBSD 4.0. vintage!! 💖

💀 BUGS 💀

Interrupt support is unimplemented 🙈 like, the vibe is there but the code isn't, iykyk

ngl bestie, if you're wiring one of these up, double-check your addr and flags against the table above before you start, okay? 🫶 that's the whole plot.

⭐ so this page is from the Debian build of the lmtemp(4) manual, dated January 1, 2016 — slay, happy new year to whoever wrote that — and that's the whole thing, no notes, periodt 💅✨🌈

📦 where this page comes from