LM94021QBIMG/NOPB National Semiconductor, LM94021QBIMG/NOPB Datasheet

IC TEMP SENSOR ± 1.5°C TO ± 2.7°C SC70-5

LM94021QBIMG/NOPB

Manufacturer Part Number
LM94021QBIMG/NOPB
Description
IC TEMP SENSOR ± 1.5°C TO ± 2.7°C SC70-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LM94021QBIMG/NOPB

Ic Output Type
Voltage
Sensing Accuracy Range
± 2.7°C
Supply Current
13µA
Supply Voltage Range
1.5V To 5.5V
Sensor Case Style
SC-70
No. Of Pins
5
Msl
MSL 1 - Unlimited
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2010 National Semiconductor Corporation
Multi-Gain Analog Temperature Sensor
General 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 tempera-
ture. 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 V
without any pull-up or pull-down resistors, reducing compo-
nent count and board area. These inputs can also be driven
by logic signals allowing the system to optimize the gain dur-
ing operation or system diagnostics.
Applications
Connection Diagram
Cell phones
Wireless transceivers
Battery management
Automotive
5-Pin SC70
Top View
201086
20108601
LM94021/LM94021Q
DD
or Ground
■ 
■ 
■ 
■ 
Features
Key Specifications
Typical Transfer Characteristic
Supply Voltage
Temperature Accuracy
Operating Temperature
Disk drives
Games
Appliances
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
Supply Current
Output Voltage vs. Temperature
−50°C to 150°C
−50°C to 70°C
−50°C to 90°C
20°C to 40°C
February 3, 2010
−50°C to 150°C
www.national.com
20108624
1.5V to 5.5V
9 μA (typ)
±1.5°C
±1.8°C
±2.1°C
±2.7°C

Related parts for LM94021QBIMG/NOPB

LM94021QBIMG/NOPB Summary of contents

Page 1

... Cell phones ■ Wireless transceivers ■ Battery management ■ Automotive Connection Diagram 5-Pin SC70 Top View © 2010 National Semiconductor Corporation LM94021/LM94021Q ■ Disk drives ■ Games ■ Appliances Features ■ LM94021Q is AEC-Q100 Grade 0 qualified and is manufactured on an Automotive grade Flow ■ ...

Page 2

... Typical Application Full-Range Celsius Temperature Sensor (−50°C to +150°C) operating from a Single Battery Cell Ordering Information Package Part Number LM94021BIMG 5-Pin SC70 LM94021BIMGX LM94021QBIMG 5-Pin SC70 LM94021QBIMGX Pin Descriptions Label Pin Number Type GS1 5 Logic Input GS0 1 Logic Input OUT ...

Page 3

... 0°C to +150° −50°C to +0° Machine Model (Note 1) Soldering process must comply with National's −0.3V to +6.0V Reflow Temperature Profile specifications. Refer to www.national.com/packaging. −0. 0.5V) DD ±7 mA Operating Ratings −0.3V to +6. Specified Temperature Range −65°C to +150°C LM94021 Supply Voltage Range (V +150° ...

Page 4

... OUT Note 12: Guaranteed by design. Note 13: The input current is leakage only and is highest at high temperature typically only 0.001 µA. The 1 µA limit is solely based on a testing limitation and does not reflect the actual performance of the part. Note 14: Line regulation is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply voltage. The typical line regulation specification does not include the output voltage shift discussed in Section 5 ...

Page 5

... Typical Performance Characteristics Temperature Error vs. Temperature Supply Current vs. Temperature Load Regulation, Sourcing Current Minimum Operating Temperature vs. Supply Voltage 20108607 Supply Current vs. Supply Voltage 20108604 Load Regulation, Sinking Current 20108640 5 20108606 20108605 20108641 www.national.com ...

Page 6

Change in V vs. Overhead Voltage OUT Line Regulation: Output Voltage vs. Supply Voltage Gain Select = 00 Line Regulation: Output Voltage vs. Supply Voltage Gain Select = 10 www.national.com Supply Noise Gain vs. Frequency 20108642 Line Regulation: Output Voltage ...

Page 7

... The LM94021 has four selectable gains, each of which can be selected by the GS1 and GS0 input pins. The output volt- age for each gain, across the complete operating temperature range is shown in the LM94021 Transfer Table, below. This table is the reference from which the LM94021 accuracy specifications (listed in the Electrical Characteristics section) are determined ...

Page 8

Temperat ure (mV) (mV) (°C) 34 849 1291 35 843 1283 36 838 1275 37 832 1267 38 827 1258 39 821 1250 40 816 1242 41 810 1234 42 804 1225 43 799 ...

Page 9

... To ensure good thermal conductivity, the backside of the 814 LM94021 die is directly attached to the GND pin (Pin 2). The 800 temperatures of the lands and traces to the other leads of the LM94021 will also affect the temperature reading. 786 Alternatively, the LM94021 can be mounted inside a sealed- ...

Page 10

... V DD This slight shift (a few millivolts) takes place over a wide change (approximately 200 mV shift takes place over a wide temperature change of 5°C to 20° the Electrical Characteristics table already include this pos- sible shift. 6.0 SELECTABLE GAIN FOR OPTIMIZATION AND IN SITU ...

Page 11

... Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the ADC charges the sampling cap, it requires instantaneous charge from the output of the analog source such as the LM94021 temperature sensor and many op amps. This requirement is easily accommodated by the addition of a capacitor (C on the size of the sampling capacitor and the sampling frequency ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 5-Pin SC70 NS Package Number MAA05A 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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