The LM94021 is a precision analog output CMOS integrated-circuit temperature sensor that operates at a supply voltage as low as 1.5V. While operating over the wide temperature range of −50°C to +150°C, the LM94021 delivers an output voltage that is inversely proportional to measured temperature. The LM94021's low supply current makes it ideal for battery-powered systems as well as general temperature sensing applications.
Two logic inputs, Gain Select 1 (GS1) and Gain Select 0 (GS0), select the gain of the temperature-to-voltage output transfer function. Four slopes are selectable: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. In the lowest gain configuration (GS1 and GS0 both tied low), the LM94021 can operate with a 1.5V supply while measuring temperature over the full −50°C to +150°C operating range. Tying both inputs high causes the transfer function to have the largest gain of −13.6 mV/°C for maximum temperature sensitivity. The gain-select inputs can be tied directly to VDD or Ground without any pull-up or pull-down resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics.
|Part number||Order||Local sensor accuracy (Max) (+/- C)||Operating temperature range (C)||Supply voltage (Min) (V)||Supply voltage (Max) (V)||Supply current (Max) (uA)||Sensor gain (mV/Deg C)||Rating||Features||Output impedance (ohms)||Interface|
||1.5||-50 to 150||1.5||5.5||12||-5.5 to -13.6||Catalog||UL Recognized||8||Analog Output|
-40 to 125
-55 to 130
Industry standard pinout
||1.5||-50 to 150||1.5||5.5||8.1||-5.5 to -13.6||Catalog||
Selectable gain setting
||1.5||-50 to 150||1.5||5.5||8.1||-5.5 or -8.2||Catalog||Selectable gain setting||4.4||Analog Output|
||2.7||-50 to 150||1.5||5.5||8.1||-5.5||Catalog||Industry standard pinout||Analog Output|