MS5540C
Miniature Barometer Module
SENSOR SOLUTIONS ///MS5540C
CONNECTION TO PCB
The package outline of the module allows the use of a flexible PCB to connect it. This can be important for
applications in watches and other special devices, and will also reduce mechanical stress on the device.
For applications subjected to mechanical shock, it is recommended to enhance the mechanical reliability of the
solder junctions by covering the rim or the corners of MS5540C's ceramic substrate with glue or Globtop-like
material.
DECOUPLING CAPACITOR
Particular care must be taken when connecting the device to power supply. A 47 F tantalum capacitor must be
placed as close as possible of the MS5540C's VDD pin. This capacitor will stabilize the power supply during data
conversion and thus, provide the highest possible accuracy.
APPLICATION EXAMPLE: ALTIMETER SYSTEM USING MS5540C
MS5540C is a circuit that can be used in connection with a microcontroller in diving computer applications. It is
designed for low-voltage systems with a supply voltage of 3V, particularly in battery applications. The MS5540C is
optimised for low current consumption as the AD-converter clock (MCLK) can use the 32.768 kHz frequency of a
standard watch crystal, which is supplied in most portable watch systems.
For applications in altimeter systems MEAS Switzerland can deliver a simple formula to calculate the altitude, based
on a linear interpolation, where the number of interpolation points influences the accuracy of the formula.
Figure 7: Demonstration of MS5540C in a mobile altimeter
