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LM83 Datasheet(PDF) 2 Page - Texas Instruments |
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LM83 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 22 page LM83 Triple-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface General Description The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the tem- perature of three external devices, such as Pentium II® Pro- cessors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedi- cated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83’s registers at any time. Activation of a T_CRIT_A output oc- curs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an INT output occurs when any temperature is greater than its corresponding pro- grammable comparator HIGH limit. The host can program as well as read back the state of the T_CRIT register and the four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127˚C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the Ana- log Devices ADM1021. Features n Accurately senses die temperature of 3 remote ICs, or diode junctions n On-board local temperature sensing n SMBus and I 2C compatible interface, supports SMBus 1.1 TIMEOUT n Two interrupt outputs: INT and T_CRIT_A n Register readback capability n 7 bit plus sign temperature data format, 1 ˚C resolution n 2 address select pins allow connection of 9 LM83s on a single bus Key Specifications j Supply Voltage 3.0V to 3.6V j Supply Current 0.8mA (max) j Local Temp Accuracy (includes quantization error) 0˚C to +85˚C ±3.0˚C (max) j Remote Diode Temp Accuracy (includes quantization error) +25˚C to +100˚C ±3˚C (max) 0˚C to +125˚C ±4˚C (max) Applications n System Thermal Management n Computers n Electronic Test Equipment n Office Electronics n HVAC Simplified Block Diagram SMBus™ is a trademark of the Intel Corporation. Pentium II® is a registered trademark of the Intel Corporation. I2C® is a registered trademark of the Philips Corporation. DS101058-1 November 1999 © 2000 National Semiconductor Corporation DS101058 www.national.com |
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