Part # LM82 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM82 Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface

Part Details:

LM82 August 2004 Remote LM82Remote Diode and Local Digital Temperature Sensor Diode with Two-Wire InterfaceGeneral Description n SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT The LM82 is a digital temperature sensor with a 2 wire serial and n Two interrupt outputs: INT and T_CRIT_A interface that senses the voltage and thus the temperature of n Register readback capability a remote diode using a Delta-Sigma analog-to-digital con-verter with a digital over-temperature detector. The LM82 n 7 bit plus sign temperature data format, 1 °C resolution Local accurately senses its own temperature as well as the tem- n 2 address select pins allow connection of 9 LM82s on a perature of external devices, such as Pentium II® Proces- single bus sors or diode connected 2N3904s. The temperature of anyASIC can be detected using the LM82 as long as a dedi- Key Specifications Digital cated diode (semiconductor junction) is available on the die.Using the SMBus interface a host can access the LM82 s j Supply Voltage 3.0V to 3.6V registers at any time. Activation of a T_CRIT_A output oc- j Supply Current 0.8mA (max) curs when any temperature is greater than a programmable j Local Temp Accuracy (includes quantization error) comparator limit, T_CRIT. Activation of an INT output occurs T when any temperature is greater than its corresponding 0°C to +85°C ±3.0°C (max) emperature programmable comparator HIGH limit. j Remote Diode Temp Accuracy (includes quantization The host can program as well as read back the state of the error) T_CRIT register and the 2 T_HIGH registers. Three state +25°C to +100°C ±3°C (max) logic inputs allow two pins (ADD0, ADD1) to select up to 9 0°C to +125°C ±4°C (max) SMBus address locations for the LM82. The sensor powersup with default thresholds of 127°C for T_CRIT and allT_HIGHs. The LM82 is pin for pin and register compatible Applications with the LM84, Maxim MAX1617 and Analog Devices Sensor ADM1021. n System Thermal Management n Computers Features

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LM82.pdf Datasheet