LM94022/-Q1 1.5-V, SC70, Multi-Gain Analog Temperature Sensor With Class-AB Output
1 Features
- LM94022/-Q1 is AEC-Q100 Grade 0 qualified and is Manufactured on an Automotive Grade Flow
- Low 1.5-V to 5.5-V Operation With Low 5.4-µA Supply Current
- Push-Pull Output With ±50-µA Source Current Capability
- Four Selectable Gains
- Very Accurate Over Wide Temperature Range of −50°C to +150°C:
- ±1.5ºC Temperature Accuracy for 20ºC to 40ºC Range
- ±1.8ºC Temperature Accuracy for –50ºC to 70ºC Range
- ±2.1ºC Temperature Accuracy for –50ºC to 90ºC Range
- ±2.7ºC Temperature Accuracy for –50ºC to 150ºC Range
- Output is Short-Circuit Protected
- Extremely Small SC70 Package
- For the Similar Functionality in a TO-92 Package, See LMT84, LMT85, LMT86, or LMT87
- Footprint Compatible With the Industry-Standard LM20 Temperature Sensor
2 Applications
- Automotive
- Cell Phones
- Wireless Transceivers
- Battery Management
- Disk Drives
- Games
- Appliances
3 Description
The LM94022/-Q1 device is a precision analog output CMOS integrated-circuit temperature sensor with selectable linear negative temperature coefficient (NTC). A class-AB output structure gives the LM94022/-Q1 strong output source and sink current capability for driving heavy transient loads such as that presented by the input of a sample-and-hold analog-to-digital converter. The low 5.4-µA supply current and 1.5-V operating voltage of the LM94022/-Q1 make it ideal for battery-powered systems as well as general temperature-sensing applications.
The Gain Select 1 (GS1) and Gain Select 0 (GS0) logic inputs select one of four gains for the temperature-to-voltage output transfer function: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. Selecting –5.5 mV/°C (GS1 and GS0 both tied low), allows the LM94022/-Q1 to operate down to 1.5-V supply while measuring temperature over the full range of −50°C to +150°C. Maximum temperature sensitivity, –13.6 mV/°C, is selected when GS1 and GS0 are both tied high. The gain-select inputs can be tied directly to VDD or Ground without any pullup or pulldown 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.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM94022 | SC70 (5) | 2.00 mm × 1.25 mm |
| LM94022-Q1 |
- For all available packages, see the orderable addendum at the end of the data sheet.
Full-Range Celsius Temperature Sensor (–50°C to +150°C) Operating from a Single Cell Battery
Output Temperature Characteristic
4 Revision History
Changes from E Revision (June 2013) to F Revision
- Added or changed: Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
Changes from D Revision (February 2013) to E Revision
- added parabolic equation for LM94022/-Q1 Go
Changes from C Revision (May 2005) to D Revision
- Changed layout of National Data Sheet to TI formatGo
5 Pin Configuration and Functions
Pin Functions
| PIN | TYPE | EQUIVALENT CIRCUIT | FUNCTION | |
|---|---|---|---|---|
| NAME | NO. | |||
| GS1 | 5 | Logic Input |  |
Gain Select 1 - One of two logic inputs for selecting the slope of the output response |
| GS0 | 1 | Logic Input | Gain Select 0 - One of two logic inputs for selecting the slope of the output response | |
| OUT | 3 | Analog Output |  |
Outputs a voltage which is inversely proportional to temperature |
| VDD | 4 | Power | — | Positive Supply Voltage |
| GND | 2 | Ground | — | Power Supply Ground |