Application of Epson RTC Real time Clock Module in the Field of Security Monitoring Equipment

Nov 19,2024
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Based on IoT devices, billing systems, security devices, and industrial systems that rely on accurate time information. Outdoor equipment and devices in vehicles must accurately record time and date at extreme temperatures to ensure safety and prevent data tampering. The demand for devices with low power consumption, stable frequency, and the ability to operate over a wide temperature range is increasing, while intrusion detection systems require low current consumption.

Epson, as an electronic component manufacturer, has real-time clock modules (RTC) with features such as backup battery switching, wide temperature range, high precision, and low power consumption, which help security equipment operate better. For security equipment, it is not only necessary to ensure accurate timing, but also to record key events. Epson RTC ensures precise timing even in low-temperature outdoor environments.

1. RTC module usage case: Its role in monitoring camera devices

(1) The RTC module maintains accurate time and provides date and time when an event occurs

Scenario 1:

During a power outage, the automatic power switching function RTC module monitors the main power supply. When the voltage drops due to a power outage, it automatically switches the power supply to the backup battery RTC module to maintain a low current consumption state and maintain accurate timing;

The timestamp function allows the RTC module to record the time of power outage by reading the trigger flag of the power switching function.

Scenario 2:

During power outages, the timestamp function allows the RTC module to detect event signals from battery powered sensors in backup mode and record the time of event occurrence.

(2) Built in digital temperature compensation oscillator function (DTCXO): The RTC module can maintain accurate time whether it is in the scorching summer noon or the cold winter night.

(3) Built in digital temperature compensation: oscillator function (DTCXQ) If the RTC module synchronizes with GPS or time server, it will maintain accurate time even if the network is interrupted for a long time.

2. Epson RTC is recommended for use in security equipment

(1) Recommended models are RX8901CE and RX4901CE, both of which have RTC modules with power switching, timestamp, and temperature compensation functions.

(2) RX8901CE/RX4901CE specifications: The package size is 3.2 x 2.5 x 1.0mm, and it is the smallest RTC module produced by Epson so far. The RX8901CE supports the I ² C-Bus interface, while the RX4901CE supports the SPI Bus interface. Both provide precise timing in electronic systems while meeting the requirements of small size and low current consumption.

3. 3 reasons to use RTC module

(1) Reduce standby power consumption and lower system power consumption

The timestamp function stores the time information when an event (signal) is detected. The RTC module puts the MCU in a low-power sleep state, thereby reducing the power consumption of the entire system.

(2) Power switch function, effectively utilizing backup power supply

The RTC module detects a decrease in the main power supply voltage and automatically switches to the backup power supply for operation. MOS switches can suppress leakage current and voltage drop, and compared with diode OR circuits, can achieve efficient power management of the entire system.

(3) Provide high-precision time information during temperature changes

DTCXO (Digital Temperature Compensated Crystal Oscillator) is installed in the RTC module. The RTC module provides high-precision time information up to 105 ° C.

Epson provides high-precision, low-power real-time clock module products to the market through its production technology of tuning fork type quartz crystal oscillators with low power consumption advantages and compensation circuit technology for frequency and temperature characteristics. These products are widely used in industrial, consumer, and automotive fields. In addition, our products adjust the frequency accuracy before leaving the factory, which is provided to customers on the basis of ensuring the accuracy, so there is no need to adjust the frequency when using, making great contributions to customers to improve design efficiency and product quality.