Datasheet ADT7461 (ON Semiconductor)

link to page 18 ADT7461 +15C Temperature Monitor with Series Resistance Cancellation The ADT7461 is a dual-channel digital thermometer and under/over temperature alarm intended for use in PCs and thermal management systems. It is pin- and register-compatible with the ADM1032. The
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ADT7461 has three additional features: series resistance cancellation (where up to 3 kW (typical) of resistance in series with the temperature monitoring diode may be automatically cancelled from the temperature result, allowing noise filtering); configurable ALERT output; and an extended, switchable temperature measurement range. The ADT7461
SOIC−8 NB MSOP8
can accurately measure the temperature of a remote thermal diode to
CASE 751 CASE 846AB
±1°C and the ambient temperature to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the
PIN ASSIGNMENT
ADM1032, but can be switched to a wider measurement range of −55°C VDD 1 8 SCLK to +150°C. The ADT7461 communicates over a 2-wire serial interface D+ 2 7 SDATA compatible with system management bus (SMBus) standards. An D− 3 6 ALERT/THERM2 ALERT output signals when the on-chip or remote temperature is out of THERM 4 5 GND range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a (Top View) second THERM output, if required. The SMBus address of the ADT7461 is 0x4C. An ADT7461-2 is also
MARKING DIAGRAMS
available, which uses SMBus Address 0x4D. 8
Features
ADT74 • On-Chip and Remote Temperature Sensor 61A • #YWW 0.25°C Resolution/1°C Accuracy on Remote Channel • 1°C Resolution/3°C Accuracy on Local Channel 1 • Automatically Cancels Up to 3 kW (Typ) of Resistance in Series with
SOIC−8
Remote Diode to Allow Noise Filtering ADT7461A = Specific Device Code • Extended, Switchable Temperature Measurement Range # = Pb-Free Package 0°C to +127°C (Default) or –55°C to +150°C Y = Year • W = Work Week Pin- and Register-Compatible with the ADM1032 • 2-wire SMBus Serial Interface with SMBus Alert Support • 8 Two SMBus Address Versions Available: ♦ ADT7461 SMBus Address is 0x4C T1x AYWG ♦ ADT7461-2 SMBus Address is 0x4D G • Programmable Over/Undertemperature Limits 1 • Offset Registers for System Calibration
MSOP8
• Up to Two Overtemperature Fail−Safe THERM Outputs • Small 8-lead SOIC NB or 8-lead MSOP Packages T1x = Refer to Order Info Table A = Assembly Location • 170 mA Operating Current, 5.5 mA Standby Current Y = Year • These are Pb-Free Devices* W = Work Week G = Pb-Free Package
Applications
(Note: Microdot may be in either location) • Desktop and Notebook Computers • Industrial Controllers
ORDERING INFORMATION
• Smart Batteries See detailed ordering and shipping information in the package • Embedded Systems dimensions section on page 18 of this data sheet. • Instrumentation * For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2014
1
Publication Order Number:
March, 2014 − Rev. 8 ADT7461/D