Which external RTC (for timer) is better for industrial purpose?

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Saeedk9574

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Hi everyone
I have been working to create a device for industrial purpose. I need to use a timer ic in it, but I do ot know which one is better. Does anybody know that I can use ds1307 in this device or it is not approprite for industrial devices as it is one of the chippest timers. In this regard, If you think ds1307 is not suitable, should I use ds3231 or pcf8563?
 
There is not enough information. If your chip (uC) has a crystal then it "might" be accurate enough to keep it's own time, assuming none loss of power. If connected to internet then an NTP server could be the answer. I have a clock with a Wemos board that connects to my WiFi and fetches the time via NTP - it's never wrong.

I normally use one of the (very cheap) RTC modules that include a CR2032 battery for backup and never had a problem assuming you have I²C available.

Mike.
Edit, and the ability to set the time.
 
The device will not connected to the Internet, in addition, for accuracy I decided to use an external RTC, but I am afraid ds1307 works faulty if it gets in the exposure of severe temperature. I read this on the Internet.
 
The DS1307 is only accurate to 1/2 minutes a month ( depending on crystal used ) I get a big variance on timing, but I only use the time on a generic print out so I don't mind the inaccuracy. The DS3231 is far more accurate.
 
As Ian and Nigel said, the DS3231 is extremely accurate. I have a couple DS3231-based clocks and they are accurate to within about a minute per year.

They use an internal crystal which is temperature compensated. They cost more than the DS1307, but eliminate the need for a crystal and a couple COG (preferably) caps.
 
Would a GPS module work? Would depend on location I guess. Add that with a rtc and you would have accurate time always.
 
sagor1 said:
Would a GPS module work? Would depend on location I guess. Add that with a rtc and you would have accurate time always.
Click to expand...
Tends not to be very good indoors, if it works at all - and it takes a while to connect as well.

The DS3231 is a cheap, easy, and accurate (enough) option.
 
I also recommend the DS3231.
But as others mentioned, the internal registers require initialization with a I2C- capable microcontroller.
 
schmitt trigger said:
I also recommend the DS3231.
But as others mentioned, the internal registers require initialization with a I2C- capable microcontroller.
Click to expand...
Any micro-controller is I2C capable, as it's simple to do in software.

An extra nice feature is that you can set one of the pins to provide a 1 second pulse, and use that to trigger an interrupt for the micro-controller.
 
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