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 ADT7461 has three additional features: series resistance cancellation (where up to 3 k (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 can accurately measure the temperature of a remote thermal diode to ±1°C and the ambient temperature to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the ADM1032, but can be switched to a wider measurement range of −55°C to +150°C. The ADT7461 communicates over a 2-wire serial interface compatible with system management bus (SMBus) standards. An ALERT output signals when the on-chip or remote temperature is out of 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 second THERM output, if required.
The SMBus address of the ADT7461 is 0x4C. An ADT7461-2 is also available, which uses SMBus Address 0x4D.
Features
• On-Chip and Remote Temperature Sensor
• 0.25°C Resolution/1°C Accuracy on Remote Channel
• 1°C Resolution/3°C Accuracy on Local Channel
• Automatically Cancels Up to 3 k (Typ) of Resistance in Series with Remote Diode to Allow Noise Filtering
• Extended, Switchable Temperature Measurement Range 0°C to +127°C (Default) or –55°C to +150°C
• Pin- and Register-Compatible with the ADM1032
• 2-wire SMBus Serial Interface with SMBus Alert Support
• Two SMBus Address Versions Available:
♦ ADT7461 SMBus Address is 0x4C
♦ ADT7461-2 SMBus Address is 0x4D
• Programmable Over/Undertemperature Limits
• Offset Registers for System Calibration
• Up to Two Overtemperature Fail−Safe THERM Outputs
• Small 8-lead SOIC NB or 8-lead MSOP Packages
• 170 A Operating Current, 5.5 A Standby Current
• These are Pb-Free Devices*
Applications
• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Embedded Systems
• Instrumentation
(Picture: Pinout)
