Digital temperature sensor with local and remote channels
The ADT7481ARMZ-1REEL is a digital temperature sensor from Analog Devices that monitors both its own die temperature (local) and up to one external diode-connected transistor (remote), making it a fit for CPU thermal management and system-board hot-spot tracking.
SMBus interface and supply rails
Communication runs over an SMBus serial interface, so it hangs on the same bus as most server and desktop voltage monitors without extra level shifting. Built-in features include a one-shot conversion mode for on-demand reads, a programmable limit register that can assert an output switch when a temperature threshold is crossed, and a standby mode that drops the quiescent current when the system idles.
Housed in a 10-lead MSOP (3.00 mm width, 0.118-inch pitch), the package is a standard fine-pitch surface-mount footprint. Operating temperature range is -40°C to +120°C, which covers industrial enclosures and base-station environments. The local sensing range is 0°C to 127°C; the remote channel stretches from -64°C to +191°C, so it can track a hot CPU die or a power transistor case without saturating.