Notes And Comments About Board Operation; Glass Break Detector Operation; Glass Break Sensor Testing Results; Glass Break Sensor Current Consumption Results - Renesas RL78/I1D User Manual

DETECT-IT RL78/I1D detector boards kit
You can debug the program: follow step by step, add some breakpoints ... and using all the features available in IAR
Embedded Workbench.
Step 8/ Stop the debug session
In order to terminate the debug session, please click on the button "Stop Debugging"
Figure Stop the debug session with "Stop Debugging" button
The same debugging session can be done with the others 3 boards available into the Detect it! kit, with the associated
sample programs available in the same folder.
9.

Notes and comments about board operation

Glass Break detector operation

9.1.1

Glass break Sensor Testing results

The RL78/I1D-based glass break sensor works well when tested with Interlogix 5709C-W glass break simulator on
these modes, up to ~0.5meter distance:
• Plate Glass simulation
• Tempered Glass simulation
• Laminated Glass simulation
The glass break sensor is not sensitive to most ambient room sounds. Sometimes a very loud hand clap at 0.5meter or
closer can cause a false glass break alarm.
However at 1meter distance and further, the loud hand clap is not detected.
If you do not have an Interlogix glass break simulator (or other brand simulator), you can play some emulated track
sounds with a music player to emulate the glass break event, and test the reaction of the detector.
9.1.2

Glass break Sensor Current consumption results

The current drain for the MCU and Analog Front End/operational amplifier circuitry is about 10µA average in standby
mode monitoring sound events, and with the alarm off. However the microphone average current drain by itself is about
110µA. A different microphone or different microphone circuit topology could be investigated to reduce the glass break
sensor total average current. If a microphone current drain of 32µA or lower can be implemented, then the target drain
of 42.3µA average could achieve 4 year battery life from a CR123 cell.
Alarm current is about 55mA-75mA depending on the VDD voltage. This means that the MCU active current drain of
about 1.3mA in low speed mode at 8MHz is negligible when the alarm is activated.
UM-YDETECT-IT-RL78 V1.30
Kit User Manual
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