MIKROE VAV Press Click

VAV Press Click is a compact add-on board that contains a board-mount pressure sensor. This board features the LMIS025B a low differential pressure sensor from First Sensor (part of TE Connectivity). It is based on thermal flow measurement of gas through a micro-flow channel integrated within the sensor chip. The innovative LMI technology features superior sensitivity especially for ultra-low pressures ranging from 0 to 25Pa. The extremely low gas flow through the sensor ensures high immunity to dust contamination humidity and long tubing compared to other flow-based pressure sensors. This Click board™ is suitable for pressure measurements in Variable Air Volume (VAV) building ventilation systems industrial and respiratory applications in medical. VAV Press Click is supported by a mikroSDK compliant library which includes functions that simplify software development. Keeping in mind the sensor's high sensitivity adhere to precisely defined values of the measuring range a maximum of 25Pa to avoid damage to the sensor itself. VAV Press Click as its foundation uses the LMIS025B a low differential pressure sensor that offers a digital output for reading pressure over the specified pressure span from First Sensor (part of TE Connectivity). The innovative LMI technology features superior sensitivity especially for ultra-low pressures ranging from 0 to 25Pa / 0 to 0.25mbar (0.1 in H2O). It is based on thermal flow measurement of gas through a micro-flow channel integrated within the sensor chip. The extremely low gas flow through the sensor ensures high immunity to dust contamination humidity and long tubing compared to other flow-based pressure sensors in addition to the outstanding long-term stability precision with patented real-time offset compensation and linearization techniques. The LMIS025B offers two modes of operation: Continuous mode with a 5ms sampling time which provides a near-continuous stream of pressure data and low-power mode with a 400μA Standby current which wakes the device from Sleep to serve pressure data “on-demand”. The first measurement in either mode is available after a warm-up and conversion sequence which takes approximately 25 ms. VAV Press Click communicates with MCU using the standard I2C 2-Wire interface offering linearized digital output through a 16-bit sigma-delta A/D conversion. Besides it also allows the choice of the least significant bit of its I2C peripheral address by positioning the SMD jumper labeled as ADDR SEL to an appropriate position marked as 0 and 1. This 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.