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.