Temperature monitoring with ±1.75°C ceiling
The ADT7488AARMZ-RL is a temperature monitoring system from Analog Devices that reads both an on-chip sensor and an external diode-connected transistor. The ±1.75°C maximum accuracy sets the measurement uncertainty — if your system alarm threshold is 105°C, a reading of 103.25°C could already be at the limit. The internal sensor covers -40°C to +125°C, while the external sensor input reads a remote diode over the same span. This dual-sensor topology lets you monitor both the IC junction and a hot spot elsewhere on the board — a power inductor, a MOSFET heatsink, or a battery cell — through a single part.
SST serial interface — not I²C, not SPI
The output type is Simple Serial Transport (SST), a proprietary Analog Devices serial protocol. It is not I²C, SPI, or SMBus — the bus timing and command structure are specific to this family. If your existing firmware stack expects a standard two-wire interface, the SST bus requires a dedicated bit-bang or hardware SST controller. The 10-MSOP package (3.00 mm width, 0.118" pitch) keeps the footprint small, but the interface choice is the real design constraint. Supply voltage is 3V to 3.6V, which maps cleanly onto a 3.3V rail. The part draws only the ADC and register bank current — no fan driver, no alarm output — so the thermal load on the board from the sensor itself is negligible.
Active lifecycle — no LTB clock ticking
The bulk package is the standard tube format. No board spin or firmware change is needed between the two.