The second feature and application of RTC

Apr 12,2024
115 VIEWS

General RTC module equipment management time calendar, timer, etc. From year one to two. Some Epson RTCs

The module can manage the second function by using a split frequency from 32768 Hz. This document

Three specific application programs of the RTC module are described. (Table 1)

The functions and products in Table 1

[FOUT function application]

Figure 1 illustrates the divider circuit of the RTC module (RA8000CE), which can provide several types of divider circuits

The frequency is 32768 Hz. FOUT pin has frequency output.

RA8000CE can output 32768Hz, 1024 Hz, or 1 Hz.

Figure 2 shows the application of an analog-to-digital converter (ADC). Low speed ADC can be used for low-frequency delivery. 1024 Hz, 32768 Hz The FOUT pin can provide ADC sampling clock. Some other RTC module devices can output 4096 Hz.

Figure 3 illustrates the system clock of a 32768 Hz microcontroller unit. Therefore, the customer does not have any information

The necessity of using a 32768 Hz crystal oscillator circuit for microcontroller devices.

Second application

Typically, timestamps are captured for each frame of data in video image applications. This timestamp data is used for appropriate movie playback to determine the order of fame. But some systems are unable to capture timestamp data from MPEG (Movie Expert Group), and H.264 causes system limitations. In this case, sub second time data will be captured to each frame.

Figure 4 illustrates the time data provided by the RTC module (RX-8803SA/LC) for video recording. The camera microcontroller requires the RTC module to send the time and date for each frame. RTC module sending time and date

Including 1/100 second of each frame.

This video system can correctly play video frames and also determine frame order.

RX8901CE, RX4901CE, RA8000CE, RA4000CE products have the ability to capture time data

The resolution decreased to 1/512 and 1/1024 seconds.

By using a 1/100 second timestamp, video playback quality can be viewed correctly. Users can also determine

Frame sorting. See Figure 5.

This 1/100 second (0.01 second cycle) timestamp can manage webcam applications (30 frames)/

The second cycle is 0.033 seconds, and the security camera application is 5 frames per second and 0.2 seconds.

In Figure 6, after time synchronization between cameras A and B and GNSS (Global Navigation Satellite System), these cameras record the same skier with 1/100 second of time data, and cameras A and B obtain the timing sequence of frames.

Therefore, users can analyze the skier's photo frame using two different camera orientations.

[Submit Second Timestamp Application]

By combining Epson RTC modules and microcontrollers, users of FPGA (Field Programmable Gate Array) systems can

Manage timestamp operations for recording event times, etc. Power outage, system error, etc.

RX8111CE and RX4111CE can record the time from year to the following year. There are also RA8000CE and RA4000CE from year to second. Figure 7 shows a block diagram of the RA8000 timestamp. This product can record any BCD (binary file)

Encoded in decimal format or binary format.

Many computer systems can manage second timestamps by using microcontrollers and FPGAs. By using a combination of microcontroller, FPGA, and RA8000CE, users can store timestamp data in the RTC module for data backup operations when an event occurs. Therefore, even during power outages, users can recognize timestamp records. In addition to using regular BCD format dates, users can also use binary dates. See Figure 8.