User's Guide

Gen2 BLE Sensor Family User Guide T0007796_UG_Portable Version 0.2
TEKTELIC Communications Inc. Page 15 of 30
a battery pull-tab or reset button pinhole as in the AA-cell enclosures. The reed switch
therefore is included in the C-cell devices to address these purposes:
1. To wake the device from sleep (the C-cell variants are shipped in a state of deep sleep
since battery pull-tabs are not available).
2. To put the device to sleep.
3. To reset the device (since the C-cell variants do not have a reset button).
4. To force an UL.
The position on the exterior of the enclosure on which the magnet must be placed to activate
the reed switch is shown in Figure 1-4.
For more information on how to wake the device from sleep, refer to Section 2.4. For more
information on how to use the reed switch for the other purposes, refer to the specific TRM
document for the sensor.
1.4.3 Temperature and Relative Humidity Transducer
All Gen2 sensor variants have the ability to measure and report the MCU temperature. This is
accomplished using a transducer located in the device microprocessor.
The sensors can be configured to report temperature values or to report alarms based on a
customer-configured normal operating window. High and low alarm points can be set
individually for MCU temperature. The sample rate for checking the transducers is user
configurable with different sample rates settable if the measured value is inside or outside the
normal operating window.
1.4.4 Accelerometer Transducer
All Gen2 sensor variants support motion sensing through an integrated 3-axis accelerometer
which can optionally be disabled. The main role of the accelerometer in the is to detect motion
that can indicate a change of the sensor’s status from stillness to mobility, or vice versa.
In the case of the variants that fall into the Contact Tracing functional grouping, the accelerometer
is used to detect when the device has been immobile for a period of time and can therefore enter
an inactivity state to conserve battery life.
In the case of all other variants, the accelerometer generates an acceleration alarm when a motion
event is detected that may or may not be reported OTA (user-configurable). An acceleration event
report is based on exceeding a defined acceleration alarm threshold count in a defined alarm
threshold period. These thresholds can be customized such that there will not be multiple