LM94021 ±1.5°C Temperature Sensor with Multiple Gain Analog Output Options | TI.com

LM94021 (ACTIVE) ±1.5°C Temperature Sensor with Multiple Gain Analog Output Options

 

Description

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.

Features

  • LM94021Q is AEC-Q100 Grade 0 Qualified
    and is Manufactured on an Automotive Grade Flow
  • Low 1.5V Operation
  • Four Selectable Gains
  • Very Accurate Over Wide Temperature Range of
    −50°C to +150°C
  • Low Quiescent Current
  • Output is Short-Circuit Protected
  • Extremely Small SC70 Package
  • Footprint Compatible with the Industry-Standard
    LM20 Temperature Sensor
  • UL Recognized Component

Parametrics

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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
LM94021 Order now 1.5     -50 to 150     1.5     5.5     12     -5.5 to -13.6     Catalog     UL Recognized     8     Analog Output    
LM20 Order now 1.5     -40 to 125
-55 to 130    
2.4     5.5     7     -11.7     Catalog     Industry standard pinout
UL Recognized    
160     Analog Output    
LM94022 Order now 1.5     -50 to 150     1.5     5.5     8.1     -5.5 to -13.6     Catalog     Selectable gain setting
UL Recognized    
5.2     Analog Output    
LM94023 Order now 1.5     -50 to 150     1.5     5.5     8.1     -5.5 or -8.2     Catalog     Selectable gain setting     4.4     Analog Output    
LMT84 Order now 2.7     -50 to 150     1.5     5.5     8.1     -5.5     Catalog     Industry standard pinout       Analog Output