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Description: RTC stands for real time clock folks. The DS3234 is a low-cost, extremely accurate SPI bus RTC with an integrated temperature compensated crystal oscillator (TCXO) and crystal.

And yes, a breakout board is coming soon.


  • Battery Backup Input for Continuous Timekeeping
  • High-precision (±2ppm)
  • Operating Temperature Range 0°C to +70°C
  • Low-Power Consumption
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2099
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • 4MHz SPI Bus Supports Modes 1 and 3
  • Digital Temp Sensor Output: ±3°C Accuracy
  • Register for Aging Trim
  • Active-Low RST Input/Output
  • 300-Mil, 20-Pin SO Package


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Customer Comments

  • Vaild up to 2099? Is this the beginning of a Y2.1K bug?

    • It’s a physical design limitation, And it is valid until 2199, not 2099. Smart software could compensate by maintaining it’s own century counter in the RTC’s SRAM. However i doubt this device could last more than 200 years in the field. Wikipedia has a nice article on semiconductor failure modes if your interested.

      • No, it’s 2099, and it’s nothing to do physical, it’s a calendar thing. The device adds a leap day on multiples of 4 years, but 2100 is not a leap year.

    • no, its just the time until the plutonium 239 inside the chip reaches it’s half-life

  • What are the dimensions of this part? I could not find them in the datasheet.

    • The datasheet doesn’t include the actual dimension data, but rather includes a link to another document that does have it.

  • Hello, I’ve two DS3234 connected to two different Arduinos, I followed this tutorial one of them works perfectly but the other show me the following in Serial monitor:

    10/10/10 10:10:0 11/11/11 11:11:11 12/12/12 12:12:12 13/13/13 13:13:13 14/14/14 14:14:14 15/15/15 15:15:15 16/16/16 16:16:16 17/17/17 17:17:17 18/18/18 18:18:18 19/19/19 19:19:19 20/0/20 20:20:20 21/1/21 21:21:21 22/2/22 22:22:22 23/3/23 23:23:23 24/4/24 24:24:24 25/5/25 25:25:25 26/6/26 26:26:26 27/7/27 27:27:27 28/8/28 28:28:28 29/9/29 29:29:29 30/10/30 3:30:30 31/11/31 4:31:31 32/12/32 5:32:32 33/13/33 6:33:33 34/14/34 7:34:34 35/15/35 8:35:35 36/16/36 9:36:36 37/17/37 10:37:37 38/18/38 11:38:38 39/19/39 12:39:39 0/0/40 0:40:40 1/1/41 1:41:41 2/2/42 2:42:42 3/3/43 3:43:43 4/4/44 4:44:44 5/5/45 5:45:45 6/6/46 6:46:46

    It seems that every second increase all records in one unit, if I only read every 5 seconds they increased 5 units. Could it be a wiring or soldering problem or is the DS3234 damaged?

    Best regards.

  • I wish I could find an inexpensive WWVB receiver circuit to go along with this to set the time automatically (radio conditions permitting, of course). Sparkfun no longer offers their WRL-10060 RoH kit and the closest thing I found was from Galleon, which sells a receiver circuit (EM2s) @ $40 and an antenna $27 plus $20 s/h.

    It’s cheaper to cannibalize an “atomic” clock.

  • is there an eagle library for this part?

  • Wow. We’ve been waiting a LONG time for a board for this chip. It looks like such a great set of features for a good price. I wonder why it seems to have been orphaned by SparkFun?
    While I wait for SF, it looks like I can get a 20 Pin SOIC adapter for 70 cents from Futurlec. I’ll have to kludge the battery, etc. but really need to get on with the project.

  • any due date on the board?

  • Anxiously awaiting the breakout board!

  • Really looking for the breakout board on this one, but if it isn’t forthcoming soon, I’ll have to go with the chronodot from adafruit instead. Hope it’s on the way…

  • fluidic:

    A nice addition. But could we get the DS3231 for I2C?.
    Why the desire for I2C?.

    • Two wires less? Compatibility with existing I2C chips and peripherals?
      Also, do you really need duplex comms on a clock?

  • Shouldn’t this be under SMD ICs not General ICs?

  • I think i ordered an I2C version from Maxim a while back.
    It was a DS32B35-33#, It even had the same package.

  • Eagerly awaiting the breakout board. I was looking at this chip just a couple of days before you announced you were carrying it.
    This would be a good match for your PRT-09216 3.3v step-up board.

  • A nice addition. But could we get the DS3231 for I2C? And possibly update the DS1307 to DS1337?

  • 2100 if I remember right is NOT a leap year, so it probably does a mod4 test.
    Now if only sparkfun would do I2C. A current mirror “breakout” would solve many bus problems.

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