One of the combined application cases of Epson ultra-low power RTC and Panasonic batteries in Japan

Mar 13,2024
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Smoke detector, also known as smoke alarm, is an instrument that monitors the concentration of smoke to achieve fire prevention.

At present, some brands of smoke detectors have obtained the 3C certification of the Chinese household detector standard. The products are easy to install and have significant effects. They are recommended by fire brigades in various regions and are widely used in important fire prevention places such as homes, factories, office buildings, hospitals, schools, and museums.

This article introduces the integration of Japanese Epson RTC and Panasonic batteries to achieve ultra-low power consumption, ultra reliability, and high cost-effectiveness applications.

Due to the characteristics and design requirements of the product, there is a high demand for overall power consumption, making power consumption a key factor in the selection of devices. The device needs to record and store time logs of events, so ultra-low power RTC (Real Time Clock) is crucial for extending the lifespan of the device, and stable and reliable batteries are also a guarantee of product performance.

Key component selection:

EPSON's RTC

Module RX-8111CE (PKG: 3.2 * 2.5 * 1.0mm)

EPSON's RTC series products are characterized by high reliability, high stability, low power consumption, rich functionality, and miniaturization, and are widely used in fields such as the Internet of Things, consumer electronics, and industrial control. RX-8111CE is EPSON's latest ultra-low power miniaturized 3225 packaged real-time clock module.

Technical parameters: Built in 32.768KHz crystal

Interface type: IIC bus (supports 400k speed)

Ultra low standby power consumption: 100nA Typ@ 3.0V

Wide operating voltage, power management function: 1.6 V to 5.5 V; Automatic switching management of main and backup power (supporting multiple backup power types)

Timestamp function: 8-level timestamp recording depth, multiple optional triggers

Rich function interrupt output: supports interrupt settings such as Alarm, Update, Timer, etc

Self detection function: voltage detection, crystal oscillator status detection

Panasonic

Button battery CR2032

Battery size (Max. Size): Φ 20.0X3.2mm

Nominal capacity: 225mAh

Rated voltage: 3.0V

Operating Temperature: -20 ° C~+60 ° C

Reference weight: 3.0g

Design reference:

RTC provides real-time clock data during product operation to record the time of various events, and is in an uninterrupted working state (without sleep). The power consumption of RTC itself is an important indicator. At the same time, the interrupt function of RTC can be used to achieve the timed wake-up function of the microprocessor, achieving the goal of reducing the overall power consumption of the system.

The timestamp function of RX-8111CE can also be used to monitor external signal inputs while the MCU is in sleep mode. The EVIN pin of RTC can monitor external level changes and record the time of the change in RTC. When the MCU recovers, the timestamp data is read and processed accordingly (refer to the RTC user manual for specific operations). The organic combination of RTC and batteries can greatly improve the service life and quality of products.