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Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. ADT7481 Dual Channel Temperature Sensor and Overtemperature Alarm The ADT7481 is a 3-channel digital thermometer and under/ over temperature alarm, intended for use in PCs and thermal management www.onsemi.com systems. It can measure its own ambient temperature or the temperature of two remote thermal diodes. These thermal diodes can be located in a CPU or GPU, or they can be discrete diode connected transistors. The ambient temperature, or the temperature of the remote thermal diode, can be accurately measured to 1C. The temperature MSOP10 measurement range defaults to 0C to +127C, compatible with CASE 846AC ADM1032, but can be switched to a wider measurement range from 64C to +191C. PIN ASSIGNMENT The ADT7481 communicates over a 2-wire serial interface compatible with System Management Bus (SMBus) standards. The V 1 10 SCLK DD SMBus address of the ADT7481 is 0x4C. An ADT7481 1 with an D1+ 2 9 SDATA SMBus address of 0x4B is also available. D1 3 ADT7481 8 ALERT/THERM2 An ALERT output signals when the on-chip or remote temperature 4 7 THERM D2+ is outside the programmed limits. The THERM output is a comparator GND 5 6 D2 output that allows, for example, on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output if required. MARKING DIAGRAM Features 10 1 Local and 2 Remote Temperature Sensors T0x 0.25C Resolution/1C Accuracy on Remote Channels AYW 1C Resolution/1C Accuracy on Local Channel 1 Extended, Switchable Temperature Measurement Range 0C to 127C (Default) or 64C to +191C T0x = Refer to Ordering Info Table 2-wire SMBus Serial Interface with SMBus ALERT Support A = Assembly Location Programmable Over/Undertemperature Limits Y = Year Offset Registers for System Calibration W = Work Week = Pb-Free Package Up to 2 Overtemperature Fail-Safe THERM Outputs (Note: Microdot may be in either location) Small 10-lead MSOP Package 240 A Operating Current, 5 A Standby Current ORDERING INFORMATION These Devices are Pb-Free, Halogen Free and are RoHS Compliant See detailed ordering and shipping information in the package dimensions section on page 20 of this data sheet. Applications Desktop and Notebook Computers Industrial Controllers Smart Batteries Automotive Embedded Systems Burn-In Applications Instrumentation Semiconductor Components Industries, LLC, 2014 1 Publication Order Number: April, 2019 Rev. 9 ADT7481/D