Mcu/Digital System And Maintain Low Current Drain For Long Battery Life; How To Start The Boards For Battery Operation; Glass Break Detector Demonstration Using Battery; Co Detector Demonstration Using Battery - Renesas RL78/I1D User Manual

DETECT-IT RL78/I1D detector boards kit
6.4.2

MCU/digital system and maintain low current drain for long battery life

• Low power interval timers like Real Time Counter, 12-bit Interval Timer, 2 units of 8-bit Interval Timer:
Real Time Counter interrupt at 1 second rate is used to wake up MCU, and count 1second intervals for alarm minimum
timing. Every third interrupt, the smoke level is measured, and otherwise the MCU goes back to standby mode.
• ADC conversion with internal VBRG = 1.45V (nominal ) reference voltage:
The ADC unit is used to measure the Ch0 output (Infrared Photodiode Trans- impedance amplified signal) with and
without the Infrared LED enabled.
• Medium speed On-Chip Oscillator (4 MHz MOCO) and special Low Power CPU run mode:
The usage of this Low Power mode and this 4MHz MOCO oscillator allow both a fast (4µs typical) wake-up time and
low current drain (134µA @ 1MHz). Since CPU performance is usually not critical for sensor applications, a lower
speed native clock at 1MHz/2MHz/4MHz can be used instead of the High Speed On-Chip Oscillator (24MHz HOCO).
However, the present demonstration uses Low Speed MCU mode @ 8MHZ system clock speed.
• PCLBUZ1 buzzer output:
When Smoke alarm is triggered, the PCLBUZ1 output is enabled for multiple durations of 1second ON and 1second
OFF, until the Ch0 (AMP0O) output is no longer triggering Comparator Ch0 interrupts.
7. How to operate the boards with battery
In order to use the boards with the battery, please make sure you are equipped with a 3V Lithium battery CR123. Only
one CR123 battery is provided with each kit.
Once the jumpers of each board are set, please follow the below steps.

Glass Break detector demonstration using battery

Step 1 / Insert the CR123 battery into the battery location of the Glass Break detector (this is on the reverse side of the
board), please be careful about the polarity.
Step 2 / Press the reset button.
Step 3 / Test the Glass Break board with some different noise. For more information, please refer to chapter 9.1.1 of
this User Manual.
Step 4 / Stop the alarm by pressing the reset button.
Step 5 / Power off the detector by removing the battery.

CO detector demonstration using battery

Step 1 / Insert the CR123 battery into the battery location of the CO detector (this is on the reverse side of the board),
please be careful about the polarity.
Step 2 / Press the reset button.
Step 3 / The CO detector is impossible to test without specific equipment. For more information, please refer to chapter
9.2.1 of this User Manual.
Step 4 / Stop the alarm by pressing the reset button.
Step 5 / Power off the detector by removing the battery.

Motion detector demonstration using battery

Step 1 / Insert the CR123 battery into the battery location of the Motion detector (this is on the reverse side of the
board), please be careful about the polarity.
Step 2 / Press the reset button.
Step 3 / The motion detector is easy to test. For more information, please refer to chapter 9.3.1 of this User Manual.
UM-YDETECT-IT-RL78 V1.30
Kit User Manual
Page 49 of 59