High Accuracy DS3231 RTC & EEPROM (HCMODU0094)

Real Time Clock modules for microcontrollers
ILYBTodd
Posts: 32
Joined: Mon Nov 05, 2018 6:20 pm

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
Posts: 32
Joined: Mon Nov 05, 2018 6:20 pm

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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