Overview
The LPS28DFWTR is an ultra-compact piezoresistive absolute pressure sensor designed by STMicroelectronics. It functions as a digital output barometer, comprising a sensing element and an IC interface that communicates over the I²C or MIPI I3CSM interface. This device is notable for its lower power consumption and reduced pressure noise compared to its predecessors. The sensor is packaged in a ceramic LGA package with a metal lid, ensuring protection from water and external pressure. The metal cap can be connected to ground or left floating, depending on the application requirements.
The LPS28DFWTR is designed to meet the demands of personal electronics and consumer applications, offering high functionality and reliability.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40 | +85 | °C | |
| Operating Pressure Range (Mode 1) | 260 | 1260 | hPa | |
| Operating Pressure Range (Mode 2) | 260 | 4060 | hPa | |
| Supply Voltage | 1.7 | 3.6 | V | |
| Supply Current (AVG = 4, ODR = 1 Hz) | 1.7 | μA | ||
| Supply Current in Power-Down Mode | 0.9 | μA | ||
| Absolute Pressure Accuracy (Mode 1) | ±0.5 | hPa | ||
| Pressure Output Data Rate | 1 | 200 | Hz | |
| Pressure Output Data Bits | 24 | bits | ||
| Pressure Noise RMS | 0.32 | Pa |
Key Features
- Dual full-scale absolute pressure with water-resistant package (Mode 1: 260 ~ 1260 hPa, Mode 2: 260 ~ 4060 hPa)
- Current consumption down to 1.7 μA
- Absolute pressure accuracy: 0.5 hPa
- Low pressure sensor noise: 0.32 Pa
- Embedded temperature compensation
- 24-bit pressure data output
- Output data rate from 1 Hz to 200 Hz
- I²C or MIPI I3CSM interface
- Embedded FIFO with interrupt functions: data-ready, FIFO flags, pressure thresholds
- Supply voltage range: 1.7 to 3.6 V
- Easily sealed package with O-ring, ECOPACK lead-free compliant
Applications
- Wearables
- Altimeters and barometers for portable devices
- GPS applications
- Weather station equipment
- Sport watches
- e-cigarettes
- Water depth monitoring
Q & A
- What is the operating temperature range of the LPS28DFWTR?
The operating temperature range is from -40°C to +85°C.
- What are the two full-scale pressure modes of the LPS28DFWTR?
Mode 1: 260 ~ 1260 hPa, Mode 2: 260 ~ 4060 hPa.
- What is the minimum supply current of the LPS28DFWTR?
The minimum supply current is 1.7 μA (AVG = 4, ODR = 1 Hz).
- What is the absolute pressure accuracy of the LPS28DFWTR in Mode 1?
The absolute pressure accuracy is ±0.5 hPa.
- What interface options are available for the LPS28DFWTR?
The device supports I²C or MIPI I3CSM interfaces.
- What is the purpose of the embedded FIFO in the LPS28DFWTR?
The embedded FIFO allows for power saving by storing pressure output values, reducing the need for continuous polling by the host processor.
- What is the supply voltage range for the LPS28DFWTR?
The supply voltage range is from 1.7 V to 3.6 V.
- Is the LPS28DFWTR water-resistant?
Yes, the device has a water-resistant package with gel inside the IC to protect electrical components from water.
- What are some common applications of the LPS28DFWTR?
Common applications include wearables, altimeters, GPS devices, weather stations, sport watches, e-cigarettes, and water depth monitoring.
- How does the LPS28DFWTR handle interrupts?
The device supports interrupt functions for data-ready, FIFO flags, and pressure thresholds, which can be configured using specific registers.
