STLM20 Grade7(STLM20W87F)

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STLM20 Grade7(STLM20W87F) is a temperatures sensor IC (-55 °C to +130 °C) made by STMicroelectronics. This posting will provide the OSS-ECAL(Open Source Software for Electronic Components Abstraction Layer) for STLM20 Grade7.
MCU interface : ADC

For Datasheet, please search by model number from here as instructed by STMicroelectronics.

CAUTION:Please be sure to refer to the latest version of the Datasheet prior to actual design.

STLM20 Grade 7(STLM20W87F)

General description

The STLM20 is a precision analog output temperature sensor for low current applications where maximizing battery life is important. It operates over a –55 °C to 130 °C (grade 7) or –40 °C to 85 °C (grade 9) temperature range. The power supply operating range is 2.4 V to 5.5 V. The maximum temperature accuracy of the STLM20 is ± 1.5 °C (±0.5 °C typ) at an ambient temperature of 25 °C and VCC of 2.7 V. The temperature error increases linearly and reaches a maximum of ±2.5 °C at the temperature range extremes. The temperature range is affected by the power supply voltage. For the temperature grade 7 device, a power supply voltage of 2.7 V to 5.5 V, the temperature range extremes are +130 °C and –55 °C (decreasing the power supply voltage from 2.7 V to 2.4 V changes the low end of the operating temperature range from –55 °C to –30 °C, while the positive remains at +130 °C).
The STLM20 has a maximum quiescent supply current of 8 µA. Therefore, self-heating is negligible.

Feature

Precision analog voltage output temperature sensor
±1.5 °C maximum temperature accuracy at 25 °C (±0.5 °C typical)
Ultra-low quiescent supply current:4.8 µA (typ) and 8.0 µA (max)
Operating voltage range: 2.4 V to 5.5 V
Operating temperature range:
–55 °C to 130 °C (grade 7)
–40 °C to 85 °C (grade 9)
SOT323-5L 5-lead package
UDFN-4L 4-lead package

Application

Smartphones
Multimedia PDA devices
GPS devices
Portable medical instruments
Voltage-controlled crystal oscillator temperature monitors
RF power transistor monitor

OSS-ECAL specification

API Function

etSTS oSTLM20W87F( etCMD cmd, float32* rlt )

Return value
Parameter IN
Parameter OUT

etSTS
etCMD cmd
float32* rlt

OSS-ECAL status code
OSS-ECAL command code
Temperature -55 to 130 [°C]

etCMD
eCMD_START

Feature :
Command to start AD conversion.

Process :
1. AD conversion start.

Command API function :
etSTS oSTLM20W87F_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) / ( 2^{AD bit} )
Temperature = ((voltage value – voltage offset value) / gain) + Temperature offset value (Min, Max Limit)
3. Store Temperature to rlt.

Command API function :
etSTS oSTLM20W87F_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) / ( 2^{AD bit} )
Temperature = ((voltage value – voltage offset value) / gain) + Temperature offset value (Min, Max Limit)
5. Store Temperature to rlt.

Command API function :
etSTS oSTLM20W87F_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
STLM20W87F_HALNAME/sample	sample.c (.cpp)	Sample Application Program
	sample.h	Sample Application Header
STLM20W87F_HALNAME	oSTLM20W87F.c (.cpp)	OSS-ECAL Program for STLM20W87F
	oSTLM20W87F.h	OSS-ECAL Header for STLM20W87F
	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

* 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	Download STLM20W87F_ARDUINO_010000.zip 11.76 KB 0 count
Mbed 6.17.0	Download STLM20W87F_MBED_010000.zip 11.90 KB 0 count
ModusToolbox HAL Cat1 2.4.3	Download STLM20W87F_ModusToolbox_010000.zip 12.14 KB 0 count
MCUXpresso SDK iMXRT1051B_1052B ksdk2_0	Download STLM20W87F_iMXRT1051B1052B_010000.zip 12.81 KB 0 count
SSP 2.4.0	Download STLM20W87F_SSP_010000.zip 12.42 KB 0 count
STM32Cube FW_F4 V1.27.1	Download STLM20W87F_STM32F4_010000.zip 12.47 KB 0 count

If you get “ABC.zip was blocked because this type of file can harm your device.” in Microsoft Edge.

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