Part # LM84 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface

Part Details:

LM84 July 2000 Diode LM84Diode Input Digital Temperature Sensor with Two-Wire Input InterfaceGeneral Description Digital n Register readback capability n 7 bit plus sign temperature data format The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital n 2 address select lines enable 9 LM84s to be connected to a single bus over-temperature detector with an SMBusTM interface. TheLM84 senses its own temperature as well as the tempera- T ture of a target IC with a diode junction, such as a Pentium® Key Specifications emperature II processor or a diode connected 2N3904. A diode junction j Supply Voltage 3.0V - 3.6V (semiconductor junction) is required on the target IC s die. Ahost can query the LM84 at any time to read the temperature j Supply Current 1 mA (max) of this diode as well as the temperature state of the LM84 j Local Temperature Accuracy ±1.0°C (typ) itself. A T_CRIT_A interrupt output becomes active when the j Remote Diode Temperature Accuracy temperature is greater than a programmable comparatorlimit, T_CRIT. +60°C to +100°C ±3°C (max) The host can program as well as read back the state of the 0°C to +125°C ±5°C (max) Sensor T_CRIT register. Three state logic inputs allow two pins(ADD0, ADD1) to select up to 9 SMBus address locations for Applications the LM84. The sensor powers up with default thresholds of n System Thermal Management 127°C for T_CRIT. n Personal Computers Features n Electronic Test Equipment

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LM84.pdf Datasheet