Features • Accurately senses die temperature of 3 remote ICs, or diode junctions • On-board local temperature sensing • SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT • Two interrupt outputs: INT# and T_CRIT_A# • Register readback capability • 7 bit plus sign temperature data format, 1 °C resolution • 2 address select pins allow connection of 9 LM83s on a single bus 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 temperature of three external devices, such as Pentium II® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated 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 occurs 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 programmable 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 Analog Devices ADM1021. Key Specification  ·  Supply Voltage 3.0V to 3.6V  ·  Supply Current 0.8mA (max)  ·  Local Temp Accuracy (includes quantization error) 0°C to +85°C ±3.0°C (max)  ·  Remote Diode Temp Accuracy (includes quantization error) +25°C to +100°C ±3°C (max) 0°C to +125°C ±4°C (max) Applications • System Thermal Management • Computers • Electronic Test Equipment • Office Electronics • HVAC

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Typical Application *click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM83 Triple-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface	343 Kbytes	28-Jul-00	日本語

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM83CIMQA	CS065	2	38968	52	0	4402000	1	1249079519

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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