Pressure 16 Click Board™

Product Code: MIKROE-4765

How Does The Pressure 16 Click Board™ Work? The Pressure 16 Click Board™ as its foundation uses the WSEN-PADS, a high-resolution, ultra-compact piezoresistive absolute pressure sensor from Würth Elektronik. This MEMS-based absolute pressure sensor includes a sensing element, analogue to digital converter, filters, and digital interface that sends the digital pressure data to the host controller. The MEMS-based sensing element consists of piezo-resistors on a thin Si-diaphragm connected in a Wheatstone bridge configuration, which detects absolute pressure in a range of 26 up to 126kPa with selectable output data rate up to 200Hz. This measurement range corresponds to the altitude range from -1877m (below sea level) to 10,109m (above sea level). The absolute accuracy of the sensor, which is the output deviation from an ideal transfer function over the operating pressure range, is 100Pa that corresponds to approximately 8 meters in altitude. The piezoresistive sensing element of the WSEN-PADS is also sensitive to temperature changes and causes offset errors during pressure measurement.

Therefore, real-time temperature compensation of the measured pressure plays an essential role in achieving high accuracy performed with the on-chip temperature sensor. The Pressure 16 Click Board™ allows using both I2C and SPI interfaces with a maximum frequency of 100kHz in Standard and 400kHz in Fast mode for I2C and 8MHz for SPI communication. The selection can be made by positioning SMD jumpers labelled as COMM SEL to an appropriate position. Note that all the jumpers' positions must be on the same side, or the Click board™ may become unresponsive. While the I2C interface is selected, the WSEN-PADS allows the choice of the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled as ADDR SEL. Also, the WSEN-PADS features an interrupt signal routed on the INT pin of the mikroBUS™ socket, which indicates when a new set of measured pressure data are available, simplifying data synchronization in the digital system that uses the device. The Pressure 16 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development. Specifications Type Pressure Applications Can be used for weather station equipment, altimeter and barometer applications, industrial, consumer applications, and many more On-board modules WSEN-PADS - high-resolution, ultra-compact piezoresistive absolute pressure sensor from Würth Elektronik Key Features Low power consumption, high precision, MEMS-based piezo-resistive sensing principle, fully calibrated 24-bit pressure output, selectable output data rate up to 200Hz, embedded temperature sensor, interrupt feature, and more Interface I2C,SPI Compatibility mikroBUS Click board size S (28.6 x 25.4 mm) Input Voltage 3.3V Pinout Diagram This table shows how the pinout on the Pressure 16 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 INT Interrupt SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 SCL I2C Clock SPI Data IN SDI 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground Onboard settings and indicators Label Name Defau