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MS5536C Datasheet(PDF) 14 Page - Intersema Sensoric SA
INTERSEMA [Intersema Sensoric SA]
MS5536C Datasheet(HTML) 14 Page - Intersema Sensoric SA
/ 17 page
August 25th, 2008
The MS5536C consists in a sensor die and a mixed signal interface IC on a single ceramic substrate with Pb-free
leads attached. It is compatible with standard PCB-assembly technologies (Pick and Place followed by IR-reflow
soldering). Single sided PCB layout is possible. The device directly interfaces to a standard microcontroller, no
costly external components like Instrumentation Amplifiers or A/D converters are required. A mark on the
ceramic substrate indicates pin 1 (see Fig. 2).
The silicon pressure transducer, the IC and the bonding wires are protected against humidity by a silicone gel
and against mechanical damage by a plastic cap. The cap is also used as the pressure port. The MS5536C does
not show pressure hysteresis effects.
The simple digital 3 wire synchronous serial interface eliminates all sensitive analogue signal lines on the PCB
with their often critical routing and guarding issues. The protocol does not require specific interface cells and can
be implemented on any microcontroller using standard I/Os. The required external clock-signal of 32.768 kHz is
standard in the watch industry and readily available in most hand-held applications.
The MS5536C is well suited for battery powered portable devices. This is due to the low supply voltage of 2.2V
and the small amount of computing power required to calculate the compensated values for pressure and
temperature (use of 4-Bit microcontrollers is possible). No costly end-of-line calibrations are required as the
MS5536C contains factory stored calibration coefficients.
In order to further enhance accuracy it is recommended to periodically recalibrate the device offset in the
application software. This can be achieved by reading the compensated pressure in a known state, preferably at
p=0 (e.g. Blood Pressure Meters with vent open). The detected difference between displayed and actual
pressure can be memorized and subtracted from following readings.
The pressure range and port configurations make the MS5536C well suited for applications like blood-pressure
metering, air flow and pressure measurements in HVAC-systems and liquid level detection.
Fig. 7: Application example of the MS5536C for a battery powered device
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