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ManualsBrandsSTMICROELECTRONICS ManualsComputers & AccessoriesSTEVAL-BCN002V1B BlueNRG-Tile - Bluetooth LE enabled sensor node development kit
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50 Gauss when magnetic field is aligned with any axis, +/-25 Gauss when it is not
aligned. Automatic recovery is activated when larger fields are removed. Recovery
is complete if larger field does not exceed 1200 Gauss; if 1200 Gauss limit is
exceeded, there will be a residual magnetization of +/-100mGauss for X and Y, +/-
500mGauss for Z axis. The residual magnetization, if any, can be estimated and
compensated as it is done for hard-iron effects (see corresponding paragraph). Max
field 10000 Gauss.
• LPS22HH ambient pressure sensor in HLGA-10L package: -40 to +85 Celsius
degrees; 260 to 1260 hPa ambient pressure. Max pressure 2MPa.
• HTS221 relative humidity and temperature sensor in HLGA-6L package: -40 to
+120 Celsius degrees; 0 to 100% rH ambient relative humidity. Max temperature
+125 Celsius degrees.
• MP34DT05-A digital microphone: -40 to +85 Celsius degrees.
• VL53L1X time-of-flight ranging sensor: -20 to +85 Celsius degrees; moisture
sensitivity level 3 (MSL) as described in IPC/JEDEC JSTD-020-C.
• CR2032 typical Lithium/Manganese-Dioxide battery has 220mAh nominal capacity
and 3V open-circuit voltage at room temperature. At -20 Celsius, open-circuit
voltage is reduced from 3V down to 2.2-2.7V for 1k-100kohm loads; capacity is
reduced from 220mAh down to 45-175mAh for 1k-100kohm loads. The inability of
the battery to sustain peak currents at low temperatures may prevent correct
system operation.
16. Limitations and disclaimers
For convenience, here is a summary of the limitations in the operating conditions of the
BlueNRG-2 sensor node:
• LSM6DSO, LIS2MDL, LPS22HH and HTS221 MEMS sensors
o Mechanical stress on the package (e.g. caused by PCB bending) may
affect the measurement accuracy of all sensors.
o Conducted heat may affect measurement accuracy, especially for the
environmental sensor HTS221: see AN4722 for details.
• Operating conditions for normal operation
o Temperature between -20 and +85 Celsius degrees; but care must be
taken to ensure battery performance below 0 degrees, and above 45
degrees.