The 325540009-50 is the MS5540-CM, a miniature barometer module designed for low-power, low-voltage applications. It operates over an absolute pressure range of 10 to 1100 mbar and provides 16-bit digital data for both pressure and temperature. Key features include a supply voltage range of 2.2V to 3.6V, low standby current consumption of 0.1 µA, and an operating temperature range of -40°C to +85°C. The module contains six on-chip coefficients for software compensation and communicates via a 3-wire serial interface. Its compact 6.2 x 6.4 mm size makes it ideal for mobile altimeter systems, weather control systems, multi-mode watches, and GPS receivers.