LM45 series(LM45B, LM45C ) is a temperatures sensor IC (–20 °C to +100 °C) made by Texas Instruments. This posting will provide the OSS-ECAL(Open Source Software for Electronic Components Abstraction Layer) for LM45 series.
MCU interface : ADC
CAUTION:Please be sure to refer to the latest version of the Datasheet prior to actual design.
LM45 series(LM45B, LM45C)
General description
The LM45 series( LM45B, LM45C ) are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM45 does not require any external calibration or trimming to provide accuracies of ±2°C at room temperature and ±3°C over a full −20 to +100°C temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM45’s low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with a single power supply, or with plus and minus supplies. As it draws only 120 μA from its supply, it has very low self-heating, less than 0.2°C in still air. The LM45 is rated to operate over a −20° to +100°C temperature range.
Feature
- Calibrated Directly in ° Celsius (Centigrade)
- Linear + 10.0 mV/°C Scale Factor
- ±3°C Accuracy Guaranteed
- Rated for Full −20° to +100°C Range
- Suitable for Remote Applications
- Low Cost Due to Wafer-Llevel Trimming
- Operates from 4.0V to 10V
- Less than 120 μA Current Drain
- Low Self-Heating, 0.20°C in Still Air
- Nonlinearity Only ±0.8°C Max Over Temp
- Low Impedance Output, 20Ω for 1 mA Load
Application
- Battery Management
- FAX Machines
- Printers
- Portable Medical Instruments
- HVAC
- Power Supply Modules
- Disk Drives
- Computers
- Automotive
OSS-ECAL specification
API Function
etSTS oLM45B( etCMD cmd, float32* rlt )
Return value
Parameter IN
Parameter OUT
etSTS
etCMD cmd
float32* rlt
OSS-ECAL status code
OSS-ECAL command code
Temperature -20 to 100 [°C]
etCMD
eCMD_START
Feature :
Command to start AD conversion.
Process :
1. AD conversion start.
Command API function :
etSTS oLM45B_START( void )
Return value :
eSTS_FIN
eSTS_ERR_HAL_ADC
eSTS_ERR_COMMAND_CODE
eSTS_ERR_OTHERS_RUN
eSTS_ERR_ADC_OBJECT
NOTE :
Arduino, Mbeb, ModusToolbox not supported.
eCMD_READ
Feature :
Command that reads the AD conversion value, converts the AD conversion value to a characteristic Temperature, and stores the Temperature in rlt.
Process :
1. Read AD conversion value.
2. Convert AD conversion value to Temperature.
Voltage value = (AD conversion value × VDD) / ( 2AD bit )
Temperature = ((voltage value – voltage offset value) / gain) + Temperature offset value (Min, Max Limit)
3. Store Temperature to rlt.
Command API function :
etSTS oLM45B_READ( float32* rlt )
Return value :
eSTS_FIN
eSTS_ERR_MIN
eSTS_ERR_MAX
eSTS_ERR_HAL_ADC
eSTS_ERR_COMMAND_CODE
eSTS_ERR_OTHERS_RUN
eSTS_ERR_ADC_OBJECT
NOTE :
Please execute this API function after starting AD conversion.
Arduino, Mbeb, ModusToolbox not supported.
eCMD_START_READ
Feature :
Command that starts AD conversion, waits for AD conversion to finish, reads out the AD conversion value, converts the AD conversion value to a characteristic Temperature, and stores the Temperature in rlt.
Process :
1. AD conversion start.
2. Wait until AD conversion is completed.
3. Read AD conversion value.
4. Convert AD conversion value to Temperature.
Voltage value = (AD conversion value × VDD) / ( 2AD bit )
Temperature = ((voltage value – voltage offset value) / gain) + Temperature offset value (Min, Max Limit)
5. Store Temperature to rlt.
Command API function :
etSTS oLM45B_START_READ( float32* rlt )
Return value :
eSTS_FIN
eSTS_ERR_MIN
eSTS_ERR_MAX
eSTS_ERR_HAL_ADC
eSTS_ERR_COMMAND_CODE
eSTS_ERR_OTHERS_RUN
eSTS_ERR_ADC_OBJECT
NOTE :
Files
| Folder* | File | summary |
|---|---|---|
| LM45B_HALNAME/sample | sample.c (.cpp) | Sample Application Program |
| | sample.h | Sample Application Header |
| LM45B_HALNAME | oLM45B.c (.cpp) | OSS-ECAL Program for LM45 series |
| | oLM45B.h | OSS-ECAL Header for LM45 series |
| | oss_ecal.h | OSS-ECAL Common Header (Ver 01.00.00 or later) |
| | user_setting.c (.cpp) | Const and Table of User setting |
| | user_setting.h | Header of User setting |
| | readme.md | Readme |
| | OSS-ECAL Terms of Use.txt | OSS-ECAL Terms of Use |
* For HALNAME, please refer to HAL Support.
HAL Support List
| MCU/Board manufacturer | HAL | MCU* | Development environment* | HALNAME |
|---|---|---|---|---|
| Arduino | Arduino 1.8.6 | ATmega2560 ATmega328P | Mega 2560 Rev3 Arduino Pro Mini 3.3V | ARDUINO |
| ARM | Mbed 6.17.0 | STM32F401RETx | STM32 Nucleo-64 boards | MBED |
| Infineon | ModusToolbox HAL Cat1 2.4.3 | CYBLE-416045-02 | CY8CPROTO-063-BLE PSoC 6 BLE Prototyping Kit | ModusToolbox |
| NXP | MCUXpresso SDK iMXRT1051B_1052B ksdk2_0 | CYBLE-416045-02 | IMXRT1050-EVKB | iMXRT1051B1052B |
| Renesas | SSP 2.4.0 | R7FS7G27H3A01CFC | S7G2 SK | SSP |
| STM | STM32Cube FW_F4 V1.27.1 | STM32F401RETx | STM32 Nucleo-64 boards | STM32F4 |
| NXP | AUTOSAR (MCAL) | MPC574XG-100DS | MPC574XG-MB( Motherboard) MPC574XG-100DS(Daughter boards) | MCAL |
* MCU and development environment at the time of development. Even if the same HAL is used, different MCUs and development environments may not work together.
OSS-ECAL Download
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| HAL | Download OSS-ECAL Ver |
|---|---|
| Arduino 1.8.6 | |
| Mbed 6.17.0 | |
| ModusToolbox HAL Cat1 2.4.3 | |
| MCUXpresso SDK iMXRT1051B_1052B ksdk2_0 | |
| SSP 2.4.0 | |
| STM32Cube FW_F4 V1.27.1 | |
| MCAL | under development |
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If you are unable to download the File, please contact us and let us know the model number and HAL type. We will send you the file as an email attachment.
Built-in How to
How to incorporate OSS-ECAL into user programs
How to incorporate multiple OSS-ECALs in a user program (same MCU function)
How to incorporate multiple OSS-ECALs in a user program (different MCU function)
How to incorporate multiple identical electronic components into a user program
How to reduce the impact on user programs by replacing electronic components