The ADT7482 is a three−channel digital thermometer and under/overtemperature alarm for PCs and thermal management systems. It can measure the temperature in two remote locations, such as in the remote thermal diode in a CPU or GPU, or using a discrete diode connected transistor. This device also measures its own ambient temperature.

One feature of the ADT7482 is series resistance cancellation where up to 1.5 kΩ (typical) of resistance in series with each of the temperature monitoring diodes can be automatically cancelled from the temperature result, allowing noise filtering. The temperature of the remote thermal diodes and ambient temperature can be measured accurate to ±1°C. The temperature measurement range, which defaults to 0°C to 127°C, can be switched to a wider measurement range of from −55°C to +150°C.

Features

• 1 Local and 2 Remote Temperature Sensors

• 0.25°C Resolution/1°C Accuracy on Remote Channels

• 1°C Resolution/1°C Accuracy on Local Channel

• Automatically Cancels Up to 1.5 kΩ (Typ) of Resistance in Series with the Remote Sensors

• Extended, Switchable Temperature Measurement Range 0°C to +127°C (Default) or −55°C to +150°C

• 2−Wire SMBus Serial Interface with SMBus Alert Support

• Programmable Over/Undertemperature Limits

• Offset Registers for System Calibration

• Up to 2 Overtemperature Fail−Safe THERM Outputs

• Small, 10−Lead MSOP Package

• 240 μA Operating Current, 5 μA Standby Current

• These are Pb−Free Devices

Applications

• Desktop and Notebook Computers

• Industrial Controllers

• Smart Batteries

• Automotive

• Embedded Systems

• Burn−in Applications

• Instrumentation