1FEATURES

2? 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 to?

Footprint Compatible with the Industry-

Standard LM20 Temperature Sensor

? UL Recognized Component

APPLICATIONS

? Cell Phones

? Wireless Transceivers

? Battery Management

? Automotive

? Disk Drives

? Games

? Appliances

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.