Produktbeskrivning
This board is a compact (0.4" × 0.8") carrier for ST's LPS22DF MEMS absolute pressure sensor, or barometer. The LPS22DF is a great IC, but its small, leadless, LGA package makes it difficult for the typical student or hobbyist to use. It also operates at voltages below 3.6 V, which can make interfacing difficult for microcontrollers operating at 5 V. This carrier board addresses these issues by incorporating additional electronics, including a 3.3 V voltage regulator and level-shifting circuits, while keeping the overall size as compact as possible. The board ships fully populated with its SMD components, including the LPS22DF, as shown in the product picture.
The LPS22DF features embedded temperature compensation and has many configurable options, including selectable averaging, a choice of output data rates, several FIFO operating modes, and a programmable external interrupt signal. Its pressure output has an absolute pressure accuracy over temperature as low as ±0.5 mbar (0.05 kPa), with RMS noise of 0.0034 mbar (0.34 Pa) with maximum averaging and embedded filtering enabled. Pressure and temperature sensor data, which can be used for altimetry, are available through a digital interface configurable to operate in either I²C (TWI) or SPI mode. (See the Sample Code section below for an Arduino library that can be used to turn this sensor into an altimeter.) The MIPI I3C protocol is also supported on the I²C pins.
Compared to the earlier LPS25HB, the LPS22DF features improved accuracy and reduced noise in the output and a much higher maximum output rate (up to 200 Hz). Its configurable averaging also offers more flexibility in choosing the right balance between minimizing power consumption and reducing noise.
This LPS22DF carrier board is pin-compatible with our earlier pressure sensor carriers, including our LPS25HB board. It uses the same I²C address as previous ST pressure sensors, but some of the LPS22DF configuration registers are different, so code written to interface with an earlier pressure sensor might need to be modified to work with an LPS22DF.
The carrier board includes a low-dropout linear voltage regulator that provides the 3.3 V required by the LPS22DF, which allows the sensor to be powered from a 1.8 V to 5.5 V supply. The regulator output is available on the VDD pin and can supply almost 150 mA to external devices. The breakout board also includes a circuit that shifts the I²C/SPI clock and data in lines to the same logic voltage level as the supplied VIN, making it simple to interface the board with 5 V systems, and the board's 0.1" pin spacing makes it easy to use with standard solderless breadboards and 0.1" perfboards.
Specifications:
* Dimensions: 0.4" × 0.8" × 0.1" (10 mm × 20 mm × 3 mm)
* Weight without header pins: 0.5 g (0.02 oz)
* Operating voltage: 1.8 V to 5.5 V
* Supply current: 1 mA
* Output format (I²C/SPI): 24-bit pressure reading (4096 LSb/mbar)
* Sensitivity range: 260 mbar to 1260 mbar (26 kPa to 126 kPa)
The LPS22DF features embedded temperature compensation and has many configurable options, including selectable averaging, a choice of output data rates, several FIFO operating modes, and a programmable external interrupt signal. Its pressure output has an absolute pressure accuracy over temperature as low as ±0.5 mbar (0.05 kPa), with RMS noise of 0.0034 mbar (0.34 Pa) with maximum averaging and embedded filtering enabled. Pressure and temperature sensor data, which can be used for altimetry, are available through a digital interface configurable to operate in either I²C (TWI) or SPI mode. (See the Sample Code section below for an Arduino library that can be used to turn this sensor into an altimeter.) The MIPI I3C protocol is also supported on the I²C pins.
Compared to the earlier LPS25HB, the LPS22DF features improved accuracy and reduced noise in the output and a much higher maximum output rate (up to 200 Hz). Its configurable averaging also offers more flexibility in choosing the right balance between minimizing power consumption and reducing noise.
This LPS22DF carrier board is pin-compatible with our earlier pressure sensor carriers, including our LPS25HB board. It uses the same I²C address as previous ST pressure sensors, but some of the LPS22DF configuration registers are different, so code written to interface with an earlier pressure sensor might need to be modified to work with an LPS22DF.
The carrier board includes a low-dropout linear voltage regulator that provides the 3.3 V required by the LPS22DF, which allows the sensor to be powered from a 1.8 V to 5.5 V supply. The regulator output is available on the VDD pin and can supply almost 150 mA to external devices. The breakout board also includes a circuit that shifts the I²C/SPI clock and data in lines to the same logic voltage level as the supplied VIN, making it simple to interface the board with 5 V systems, and the board's 0.1" pin spacing makes it easy to use with standard solderless breadboards and 0.1" perfboards.
Specifications:
* Dimensions: 0.4" × 0.8" × 0.1" (10 mm × 20 mm × 3 mm)
* Weight without header pins: 0.5 g (0.02 oz)
* Operating voltage: 1.8 V to 5.5 V
* Supply current: 1 mA
* Output format (I²C/SPI): 24-bit pressure reading (4096 LSb/mbar)
* Sensitivity range: 260 mbar to 1260 mbar (26 kPa to 126 kPa)
