Below are the list of sensor’s we are going to discuss:
- HTS 221: Capacitive digital sensor for relative humidity and temperature
- LPS22HB: MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer
- BME280: Combined Humidity & Pressure Sensor
- STTS751: 2.25 V low-voltage local digital temperature sensor
1. HTS 221: Capacitive digital sensor for relative humidity and temperature.
Datasheet : https://www.st.com/resource/en/datasheet/hts221.pdf
Communication : I2C & SPI
Features:
- 0 to 100% relative humidity range
- Supply voltage: 1.7 to 3.6 V
- Low power consumption: 2 μA @ 1 Hz ODR
- Selectable ODR from 1 Hz to 12.5 Hz
- High rH sensitivity: 0.004% rH/LSB
- Humidity accuracy: ± 3.5% rH, 20 to +80% rH
- Temperature accuracy: ± 0.5 °C,15 to +40 °C
- Embedded 16-bit ADC
- 16-bit humidity and temperature output data
- SPI and I²C interfaces
- Factory calibrated
- Tiny 2 x 2 x 0.9 mm package
- ECOPACK® compliant
Application:
- Air conditioning, heating and ventilation
- Air humidifiers
- Refrigerators
- Wearable devices
- Smart home automation
- Industrial automation
- Respiratory equipment
- Asset and goods tracking
Humidity & Temperature Parameters Specification:
Code Bundle: The X-CUBE-MEMS1 expansion software package for STM32Cube runs on the STM32 and includes drivers that recognize the sensors and collect temperature, humidity, pressure and motion data.
Price:
| Range | Unit Price | Savings |
| 1 – 9 | $3.40 | 0% |
| 10 – 99 | $2.89 | 15% |
| 100 – 249 | $2.51 | 26% |
| 250 – 499 | $2.38 | 30% |
| 500 | $2.14 | 37% |
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2. LPS22HB: MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer
Datasheet: https://www.st.com/resource/en/datasheet/lps22hb.pdf
Communication: I2C & SPI
Features:
- 260 to 1260 hPa absolute pressure range
- Current consumption down to 3 μA
- High overpressure capability: 20x full-scale
- Embedded temperature compensation
- 24-bit pressure data output
- 16-bit temperature data output
- ODR from 1 Hz to 75 Hz
- SPI and I²C interfaces
- Embedded FIFO
- Interrupt functions: Data Ready, FIFO flags,
- pressure thresholds
- Supply voltage: 1.7 to 3.6 V
- High shock survivability: 22,000 g
- Small and thin package
- ECOPACK® lead-free compliant
Applications:
- Altimeters and barometers for portable devices
- GPS applications
- Weather station equipment
- Sport watches
Pressure and temperature sensor characteristics:
Code Bundle: The X-CUBE-MEMS1 expansion software package for STM32Cube runs on the STM32 and includes drivers that recognize the sensors and collect temperature, humidity, pressure and motion data.
Price:
| Range | Unit Price | Savings |
| 1 – 9 | $2.73 | 0% |
| 10 – 99 | $2.20 | 20% |
| 100 – 249 | $2.01 | 26% |
| 250 – 499 | $1.87 | 31% |
| 500 | $1.73 | 37% |
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3. BME280: Combined Humidity & Pressure Sensor
Datasheet: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
Communication: I2C & SPI
Applications:
- Context awareness, eg:skin detection, room change detection
- Fitness monitoring
- Home automation
- GPS enhancement
- Indoor navigation
- Weather forecast
- vertical velocity detection
Humidity Specification:
Pressure Specification:
Price:
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4. STTS751: 2.25 V low-voltage local digital temperature sensor
Datasheet: https://www.st.com/resource/en/datasheet/stts751.pdf
Communication : I2C
Features:
- Operating voltage 2.25 V to 3.6 V
- Operating temperature –40 °C to +125 °C
- Programmable
- – 10 different conversion rates
- 0.0625 to 32 conversions/sec.
- 1 conversion/sec. – default
- – 4 different resolutions
- 9-bit (0.5 °C/LSB) to12-bit (0.0625 °C/LSB)
- 10-bit (0.25 °C/LSB) – default
- Low supply current
- – 50 μA (typ) for 8 conversions/sec.
- – 20 μA (typ) for 1 conversion/sec.
- – 3 μA (typ) standby
- Accuracy
- – ±0.5 °C (typ) 0 °C to +85 °C
- – ±0.5 °C (typ) –40 °C to +125 °C
Applications:
- Solid state drives
- Portable electronics
- Notebook computers
- Smart batteries
- Servers
- Telecom
Code Bundle: The X-CUBE-MEMS1 expansion software package for STM32Cube runs on the STM32 and includes drivers that recognize the sensors and collect temperature, humidity, pressure and motion data.
Price:
| Quantity | $ per Unit | Savings |
|---|---|---|
| 1 – 9 | $0.88 | 0% |
| 10 – 99 | $0.76 | 14% |
| 100 – 499 | $0.58 | 34% |
| 500 | $0.52 | 41% |
| 500 + | Contact Sales |
References : www.st.com, https://www.st.com/resource/en/datasheet/stts751.pdf,https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf,https://www.st.com/resource/en/datasheet/hts221.pdf,https://www.st.com/resource/en/datasheet/lps22hb.pdf
