Product specifications

AREXX Engineering & JM3 Engineering
Version: 1.05 Nov. 9
th
, 2014 page: 5
Introduction
A general purpose barometer, hygrometer and temperature sensor module. It can be directly
plugged into the ASURO expansion port on the ASURO xTend board - it can be stacked up with
the ASURO Compass / Gyro Module and or RTC.
The sensor module is using the MS5607-02BA high resolution altimeter and the HTU21D sensor
from MEAS Switzerland with I2C bus interface. This barometric pressure sensor is optimized for
altimeters and variometers with an altitude resolution of 20 cm and can be used for weather
station information as well. In addition, the relative humidity and temperature sensor are
dedicated plug and play transducers for applications where reliable and accurate measurements
are needed.
The barometric sensor module includes a high linearity pressure sensor and an ultra-low power
24 bit ΔΣ ADC with factory calibrated coefficients.
It provides a precise digital 24 bit pressure and temperature value and different operation modes
that allow the user to optimize for conversion speed and current consumption. A high resolution
temperature output allows the implementation of an altimeter/thermometer function without any
additional sensor. The MS5607-02BA can be interfaced to virtually any micro controller. The
communication protocol is simple, without the need of programming internal registers in the
device. The sensing principle used leads to very low hysteresis and high stability of both pressure
and temperature signal.
The humidity sensor setting new standards in terms of size and intelligence and provides
calibrated, linearized signals in digital, I²C format. Every sensor element is factory calibrated and
tested. Low battery can be detected and a checksum improves communication reliability. The
resolution can be changed by command (8/12bit up to 12/14bit for RH/T).