Features
| • | 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 |
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.
| • | Cell phones |
| • | Wireless transceivers |
| • | Battery management |
| • | Automotive |
| • | Disk drives |
| • | Games |
| • | Appliances |
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