High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Real Time Clock modules for microcontrollers
ILYBTodd
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by ILYBTodd » Thu Dec 03, 2020 9:24 pm

You're the greatest!

Thanks so much.

OK, next newbie (sort of) question. What is purpose of the three solder pads labeled A0, A1, A2? I don't see them described anywhere.

andrew
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by andrew » Fri Dec 04, 2020 8:43 am

OK, next newbie (sort of) question. What is purpose of the three solder pads labeled A0, A1, A2? I don't see them described anywhere.
They represent the lower 3 bits of the I2C address for the EEPROM. By shorting them it connects the appropriate address pin on the EEPROM (A0 to A2) to GND and therefore changes its I2C address between 0x50 and 0x57. As these pins also have pullups on them, when these pads are unbridged the address pins are pulled high hence the default I2C address of 0x57.
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ILYBTodd
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by ILYBTodd » Mon Dec 07, 2020 2:09 pm

andrew wrote:
Thu Dec 03, 2020 10:07 am
Hi Todd, I've now added diagram showing the dimensions to the first post.
Are the mounting holes 2mm?

andrew
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by andrew » Mon Dec 07, 2020 2:45 pm

That's right, they are 2mm in diameter.
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steve001
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by steve001 » Sun Nov 07, 2021 6:08 pm

Hi,

Is there a circuit diagram available please ?

Regards

Steve

andrew
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by andrew » Mon Nov 08, 2021 9:40 am

A schematic has now been added to the first post of this thread
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steve001
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by steve001 » Sun Nov 14, 2021 8:34 am

thank you

Regards

Steve

andrew
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by andrew » Mon Nov 15, 2021 1:16 pm

Test post
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RetroBoy
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by RetroBoy » Fri May 05, 2023 9:01 pm

Hi Andrew,

Thought I'd use the Forum for this, maybe stupid, question.

I use DS3231 & DS1307 RTCs a lot for the Projects I do. But I have now reached the point of requiring the 'Time' data down to 1/100 second or better.

Q1: Are/is there a way of getting second times at this level from either of these RTCs ?

Q2: If not, are there any RTCs on the market that can do this ... using a Nano ?

Regards
RetroBoy

andrew
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Re: High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Post by andrew » Sat May 06, 2023 10:39 am

Q1: Are/is there a way of getting second times at this level from either of these RTCs ?
The only things I can think of is to either feed the square wave output into an interrupt pin and use that to tick a counter.

The other option would be to use the time from the RTC to calibrate the internal millis timer and then use that for your fractions of a second.

Q2: If not, are there any RTCs on the market that can do this ... using a Nano ?
I’m not aware of anything I’m afraid
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