What the ±2°C accuracy means for your thermal management loop
The MAX6647MUA+ is a digital temperature sensor that measures both its own die temperature (local) and the temperature of an external diode-connected transistor (remote), with a resolution of 11 bits over the SMBus interface. That ±2°C band is tight enough to set a fan-speed ramp or a thermal-throttle threshold without a large guard band eating into the thermal budget. The local sensing range covers 0°C to 145°C, and the remote channel covers the same span, so the part can monitor a hot CPU core or a power-stage die alongside its own ambient.
Supply voltage and SMBus integration
The SMBus output lets multiple sensors share a two-wire bus with a system manager pulling temperature data on demand. The feature set includes a one-shot conversion mode for low-power polling, an output switch for alert signaling, a programmable limit register for over-temperature thresholds, and a standby mode that drops the quiescent current between readings.
Housed in an 8-lead TSSOP/MSOP footprint (3.00 mm width), the MAX6647MUA+ is supplied in tube packaging. The supplier device package is designated 8-uMAX/uSOP, which is the standard MSOP-8 body with a 0.65 mm lead pitch.