TE Connectivity MS5803-14BA01-50 14 Bar Digital Pressure Sensor, Absolute, 24-bit ADC, I2C/SPI, SMD Module

The MS5803-14BA01-50 measures absolute pressure, meaning its readings are referenced to a perfect vacuum (0 bar). This is essential for applications like altitude or water depth measurement, where the reference is a fixed zero point. For gauge pressure (relative to atmospheric pressure), you would need to subtract the current local barometric pressure from the sensor's absolute reading.

The interface is selected via the PS pin on the module. Pulling the PS pin low (to GND) selects the SPI interface, while leaving it high (or connecting to VDD) selects the I2C interface. Ensure your microcontroller code is configured for the corresponding protocol. The I2C address is factory-set and specified in the datasheet.

The sensor requires a supply voltage (VDD) between 1.8V and 3.6V DC. All communication lines (I2C's SDA/SCL or SPI's pins) must operate at the same logic level as VDD. It is directly compatible with 3.3V microcontroller systems like most ARM Cortex-M, ESP32, and Raspberry Pi. Use a level shifter if interfacing with a 5V system.

Yes, each sensor is factory calibrated. Six calibration coefficients are stored in its internal PROM. Your firmware must read these coefficients and apply the provided compensation algorithm (detailed in the datasheet) to convert the raw ADC readings for pressure and temperature into highly accurate, temperature-compensated values.

The 30 Bar overpressure rating indicates the maximum pressure the sensor can be exposed to without causing permanent damage or a shift in its calibration. It is a safety margin significantly above its 14 Bar full-scale range, ensuring robustness against pressure spikes or surges in the system, which is critical for reliable operation in dynamic environments.