Part # LM90 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM90 ±3°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface


Part Details:

Interface LM90 February 2002 ±3°C LM90 Accurate, ±3°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire InterfaceGeneral Description n On-board local temperature sensing n 10 bit plus sign remote diode temperature data format, The LM90 is an 11-bit digital temperature sensor with a 0.125 °C resolution Remote 2-wire System Management Bus (SMBus) serial interface.The LM90 accurately measures its own temperature as well n Diode fault detection circuitry as the temperature of an external device, such as processor n T_CRIT_A output useful for system shutdown (open thermal diode or diode connected transistor such as the diode does not activate T_CRIT_A) 2N3904. The temperature of any ASIC can be accurately n ALERT output supports SMBus 2.0 protocol determined using the LM90 as long as a dedicated diode n SMBus 2.0 compatible interface, supports TIMEOUT Diode (semiconductor junction) is available on the target die. The n 8-pin MSOP packages LM90 remote sensor accuracy of ±3°C is factory trimmed forthe 1.008 typical non-ideality factor of the mobile PentiumTM Key Specifications III thermal diode. The LM90 has an Offset register to allow measuring other diodes without j Supply Voltage 3.0V to 3.6V and requiring continuous software management. Contact j Supply Current 0.8mA (typ) [email protected] to obtain the latest data for j Local Temp Accuracy (includes quantization error)


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LM90.pdf Datasheet