What are the clock chips?
I. Parallel interface
Maxim-dallast12c887 series, and now many models have been derived.
Mainly several major manufacturers Maxim Dallas, Philips and Seiko of Japan. At present, many common rtc chips in China are copied, and the price is still good. Just use it where the requirements are not high.
You can find many common models here, including ds 1302, ds 1307, ds 1337, pcf8563.
Second, serial interface.
1, PCF8563 with I2C interface Phlilps, RX8025 with PCF8563 Epson built-in crystal oscillator, with small error. Not bad: ds 1307 Ricoh from Mexin, RS5C372 from Belling in China, BL5372 from Seiko S-35390 in Japan, and X 1288 from Shenzhen Fan Wei Electronics Company. Both the crystal oscillator and the battery are built-in, and the volume is relatively large.
2. DS 1305 and DS 1302 of 2.MAXIM-DALLAS three-wire interface, in which DS 1302 has relevant imitation products in China, and PT7C4302 is the imitation model of PTI. The HT 1380 and HT 138 1 real-time clocks in Hetai, Taiwan Province Province are clocks timed by single chip microcomputer or independent clocks that can be accessed by single chip microcomputer. It can be obtained through external expansion chips, such as 1302, 1307, 12887, 3 130, 12020, m4 1t8 1. There are parallel port and serial port, battery self-play, external power supply, according to actual needs. These clocks use 32768 Hz without exception. This is because they use the same timing IC core, lower low-frequency power consumption, easier to adjust the watch and accurately realize 1Hz timing. On this basis, we have made different articles, some have stable crystal oscillator, some have power backup scheme, some have different interfaces, some have perpetual calendar, some have alarm, and some have.
3. It is also possible that the RTC module is integrated inside what you said (maybe 430 series single chip microcomputer), and it needs to be externally connected to 32768Hz. In this way, you can time independently, and the single-chip computer has nothing to do with its time management when it sleeps. The low-cost real-time scheme saves a few hairs.
These are the types of clock chips. I believe that friends who are not familiar with clock chips in the past have already learned about clock chips, and their understanding of clock components is also a step closer. Many times, we will ignore some things around us, because we often see and take it for granted and don't think deeply about other things. The clock is like this. In the past, it was only used for timing, and rarely went back to thinking about the structure of the clock, so few people knew very little about the clock chip.
Brief introduction of clock chip function
What is a clock chip?
Clock chip, as its name implies, is a chip with clock characteristics and can realize time. Clock chip is an integrated circuit, which is mainly composed of rechargeable lithium battery, charging circuit and crystal oscillator circuit. At present, it is widely used in various electronic products and information communication products.
What are the functions of the clock chip? At present, there are many kinds of popular clock chips in the market, which are widely used. These clock chips are cheap, easy to use and powerful. So, what are the functions of the clock chip?
The main functions of the clock chip are:
First of all, the clock chip has the function of displaying time and recording time.
The most basic function of the clock chip is the clock function of displaying time and recording time. The clock display function of the clock chip is extremely powerful, and it can display all time units of year, month, day, week, hour, minute and second. The clock chip also has the accurate function of making up time in leap years.
Second, the clock chip has an alarm function.
In people's daily life, the biggest function of alarm clock is to remind time. Almost all mobile phones, computers and other technology products have alarm setting function. The reason why alarm can be set is because the clock chip has alarm function.
Third, the clock chip has a data recording function.
Lithium battery is one of the components in the clock chip. After the clock chip is powered off or turned off, the lithium battery can supply power to the chip through the internal circuit of the chip, so that the clock chip can still run for a long time after the power is turned off, and the data recorded in the clock chip will not be lost.
Fourthly, the clock chip has the function of data power-off protection.
The function of clock chip is to record and store data, because it has a ram unit, part of which is used to control clock display and most of which is used to store unit data. This RAM unit has power-off protection function.
Fifth, the clock chip has a good detection function.
The interface of the clock chip is simple, and it can be connected with a variety of software, and its performance can be tested through software shielding.