DATA SHEET www.onsemi.com 1 C Temperature Monitor with Series Resistance SOIC8 NB MSOP8 Cancellation CASE 751 CASE 846AB ADT7461 PIN ASSIGNMENT The ADT7461 is a dual-channel digital thermometer and under/over temperature alarm intended for use in PCs and thermal management V 1 8 SCLK DD systems. It is pin- and register-compatible with the ADM1032. The D+ 2 7 SDATA ADT7461 has three additional features: series resistance cancellation 3 6 D ALERT/THERM2 (where up to 3 k (typical) of resistance in series with the temperature THERM 4 5 GND monitoring diode may be automatically cancelled from the temperature result, allowing noise filtering) configurable ALERT output and an (Top View) extended, switchable temperature measurement range. The ADT7461 can accurately measure the temperature of a remote thermal diode to 1C and the ambient temperature to 3C. The temperature MARKING DIAGRAMS measurement range defaults to 0C to +127C, compatible with the 8 ADM1032, but can be switched to a wider measurement range of 55C ADT74 61A to +150C. The ADT7461 communicates over a 2-wire serial interface YWW compatible with system management bus (SMBus) standards. An ALERT output signals when the on-chip or remote temperature is out of 1 range. The THERM output is a comparator output that allows on/off SOIC8 control of a cooling fan. The ALERT output can be reconfigured as a ADT7461A = Specific Device Code second THERM output, if required. = Pb-Free Package The SMBus address of the ADT7461 is 0x4C. Y = Year W = Work Week Features On-Chip and Remote Temperature Sensor 8 0.25C Resolution/1C Accuracy on Remote Channel 1C Resolution/3C Accuracy on Local Channel T1x AYW Automatically Cancels Up to 3 k (Typ) of Resistance in Series with Remote Diode to Allow Noise Filtering 1 Extended, Switchable Temperature Measurement Range MSOP8 0C to +127C (Default) or 55C to +150C Pin- and Register-Compatible with the ADM1032 T1x = Refer to Order Info Table A = Assembly Location 2-wire SMBus Serial Interface with SMBus Alert Support Y = Year ADT7461 SMBus Address is 0x4C W = Work Week Programmable Over/Undertemperature Limits = Pb-Free Package Offset Registers for System Calibration (Note: Microdot may be in either location) Up to Two Overtemperature FailSafe THERM Outputs Small 8-lead SOIC NB or 8-lead MSOP Packages ORDERING INFORMATION 170 A Operating Current, 5.5 A Standby Current See detailed ordering and shipping information in the package These are Pb-Free Devices* dimensions section on page 18 of this data sheet. Applications Desktop and Notebook Computers Industrial Controllers Smart Batteries Embedded Systems Instrumentation *For additional information on our PbFree strategy and soldering details, please download the onsemi Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. Semiconductor Components Industries, LLC, 2014 1 Publication Order Number: December, 2021 Rev. 9 ADT7461/DADT7461 ON-CHIP CONVERSION RATE ADDRESS POINTER TEMPERATURE REGISTER REGISTER SENSOR LOCAL TEMPERATURE LOCAL TEMPERATURE LOW LIMIT REGISTER VALUE REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER ANALOG LIMIT ADC MUX COMPARATOR REMOTE TEMPERATURE LOW LIMIT REGISTER RUN/STANDBY BUSY D+ 2 REMOTE TEMPERATURE REMOTE TEMPERATURE SRC HIGH LIMIT REGISTER VALUE REGISTER BLOCK D 3 LOCAL THERM LIMIT REGISTER REMOTE OFFSET EXTERNAL THERM LIMIT REGISTER REGISTER CONFIGURATION REGISTER EXTERNAL DIODE OPEN-CIRCUIT INTERRUPT STATUS REGISTER MASKING ADT7461 SMBUS INTERFACE 1 5 7 8 4 6 V GND SDATA SCLK THERM ALERT/ DD THERM2 Figure 1. Functional Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit Positive Supply Voltage (V ) to GND 0.3, +5.5 V DD D+ 0.3 to V + 0.3 V DD D to GND 0.3 to +0.6 V SCLK, SDATA, ALERT 0.3 to +5.5 V THERM 0.3 to V + 0.3 V DD Input Current, SDATA, THERM 1, +50 mA Input Current, D 1 mA ESD Rating, All Pins (Human Body Model) 2000 V Maximum Junction Temperature (T Max) 150 C J Storage Temperature Range 65 to +150 C IR Reflow Peak Temperature 220 C IR Reflow Peak Temperature for Pb-Free 260 (0.5) C Lead Temperature (Soldering 10 sec) 300 C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. NOTE: This device is ESD sensitive. Use standard ESD precautions when handling. Table 2. THERMAL CHARACTERISTICS Package Type Unit JA 8-lead SOIC NB Package 121 C/W 8-lead MSOP Package 142 C/W www.onsemi.com 2 DIGITAL MUX DIGITAL MUX