HOW DOES IT WORK?

Pressure 23 Click is based on the MS5849-30BA, an ultra-compact chlorine-resistant absolute pressure sensor from TE Connectivity. It provides precise digital 24-bit pressure and temperature values and different operation modes, allowing the user to optimize conversion speed and current consumption. The sensor features built-in automatic conversion, signaling state by interrupt, a programmable filter, and more. The sensor delivers a decent pressure sensing accuracy, which depends on the pressure measuring range. On lower pressures, it is as low as ±50mbar. In addition to pressure, this sensor can measure the temperature, which is needed for temperature compensation in a range of -20 up to 85°C with a temperature sensing accuracy of ±2°C.

The MS5849-30BA includes a high linearity pressure sensor and an ultra-low power delta-sigma ADC with internal factory-calibrated coefficients. The sensor consists of a piezo-resistive sensor and a sensor interface integrated circuit. It converts the sensor's uncompensated analog output value voltage to a 24-bit digital value. The sensor is individually factory calibrated, where, as a result, ten coefficients necessary to compensate for process variations and temperature variations are calculated and stored in the 256-bit NVRAM of the sensor.

The sensor and the sealing gel on it shouldn't be touched or damaged in any way. In applications such as outdoor watches, the electronics must be protected against direct water or humidity. For such applications, the MS5849-30BA provides the possibility to seal with an O-ring.

Pressure 23 Click can communicate with the host MCU using the 4-Wire SPI serial interface and the I2C interface. The SPI interface supports clock frequencies up to 20MHz, while the I2C clock supports up to 3.4MHz. The desired communication interface can be chosen over the 5 COMM SEL jumpers, where the SPI is set by default. If your goal is the I2C, you can choose the I2C address over the ADDR SEL jumper (0 set by default). The interrupt on the INT pin will be raised for different conditions, such as pressure and temperature thresholds, finished ADC conversion, and more.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPECIFICATIONS