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. Key Specification ■  Supply Voltage 1.5V to 5.5V ■   Supply Current 9 μA (typ) ■  Temperature Accuracy 20°C to 40°C −50°C to 70°C −50°C to 90°C −50°C to 150°C ±1.5°C ±1.8°C ±2.1°C ±2.7°C ■  Operating Temperature −50°C to 150°C Applications • Cell phones • Wireless transceivers • Battery management • Automotive • Disk drives • Games • Appliances

Also Recommended LM94023▲ Smaller MicroSMD Package (0.8mm X 0.8mm), Lower Supply Current, Greater Output Current MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LM94021 Multi-Gain Analog Temperature Sensor	976 Kbytes	13-Mar-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor	70 Kbytes	1-Oct-02

More Application Notes

Title		Size	Date	Other Language
	AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8	82 Kbytes	15-May-04
	AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85	74 Kbytes	10-Mar-04
	AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor	70 Kbytes	1-Oct-02

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM94021 MDA	CMOS7	0	18406	0	0	1089000	4	309006723
LM94021BIMG	CMOS7	0	18406	0	0	1089000	4	309006723
LM94021BIMGX	CMOS7	0	18406	0	0	1089000	4	309006723

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.

For more information on Reliability Metrics, please click here.