SKU: 71761628988

SparkFun Real Time Clock Module - RV-1805 (Qwiic)

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Description

SparkFun Real Time Clock Module - RV-1805 (Qwiic)Get with the times, already! This SparkFun Real Time Clock (RTC) Module is a Qwiic enabled breakout board for the RV 1805 chipset. The RTC is ultra low power (running at only about 22nA in its lowest power setting) so it can use a supercapacitor for backup power instead of a normal battery. This means you get plenty of charge and discharge cycles without any degradation to the battery. To make it even easier to get your readings, all communication is

Get with the times, already! This SparkFun Real Time Clock (RTC) Module is a Qwiic-enabled breakout board for the RV-1805 chipset. The RTC is ultra-low power (running at only about 22nA in its lowest power setting) so it can use a supercapacitor for backup power instead of a normal battery. This means you get plenty of charge and discharge cycles without any degradation to the �battery.“ To make it even easier to get your readings, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system so no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1”-spaced pins in case you prefer to use a breadboard.

This RTC module’s built in RV-1805 has not one, but two internal oscillators: a 32.768kHz tuning fork crystal and a low power RC based oscillator and can automatically switch between the two using the more precise crystal to correct the RC oscillator every few minutes. This feature allows the module to maintain a very accurate date and time with the worst case being +/- about three minutes over a year. The RV-1805 also has a built in trickle charger so as soon as the RTC is connected to power the it will be fully charged in under 10 minutes and has the ability to switch power to other systems allowing it to directly turn on or off a power hungry device such as a microcontroller or RF engine.

There is also the option to add a battery to the board if the supercapacitor just isn�t going keep your project powered long enough (keep in mind, the supercap can hypothetically make the board keep time for around 35 days), you can solder on an external battery. That means you can let board sit with no power or connection to the outside world and the current hour/minute/second/date will be maintained.


The SparkFun Qwiic connect system is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can�t hook it up wrong.


Get Started with the RV-1805 Real Time Clock Module Guide

Features:

  • Operating Voltage (Startup): 1.6V - 3.6V
  • Operating Voltage (Timekeeping): 1.5V - 3.6V
  • Operating Temperature: -40°C - 85°C
  • Time Accuracy: ±2.0 ppm
  • Current Consumption: 22nA (Typ.)
  • I2C Address: 0xD2
  • Supercapacitor for Backup Power
  • 2x Internal Oscillators
  • 2x Qwiic Connectors

Documents:


All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
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SKU: 71761628988

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Reviewed in the United States on May 29, 2026
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Lowell, US
★★★★★ 5
So far so good! A lot of bang for your buck.
Color: Black
So far, I LOVE this toothbrush. Lots of replacement heads included. The bristles are soft, and even for someone who has dealt with sensitivity in the past, I have zero pain using this. My teeth feel smooth and look brighter. I've been using it for a few weeks and have not needed to charge it since the initial charge. The 30 second interval timer is a fantastic feature. My one suggestion (not a complaint) for the manufacturer: Move the charging port to the side instead of the bottom, and add a waterproof protective cap for it. I am always careful not to get the port wet, but laying it down to charge isn't my favorite thing. Nevertheless, excellent product!
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latosha
Lake Worth, US
★★★★★ 3
Great Gift Idea for a Deep Clean Feeling
Color: Pale Pink
I haven’t personally used this toothbrush yet because it was purchased as a birthday gift, but I have used a similar sonic electric toothbrush before and really liked the results. My daughter-in-law loves hers, which is actually what inspired me to buy a similar one for my other daughter. The design looks nice, and these types of toothbrushes usually leave your teeth feeling much cleaner than a regular toothbrush. So far, it seems like a great gift idea and good value for the price
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Reviewed in the United States on May 29, 2026
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M. Keck
Belleville, US
★★★★★ 5
Great tasting gel that works!!
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My dental hygienist recommended this gel for my dry mouth and it tastes great and really helps!
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Reviewed in the United States on May 28, 2026
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L. Rachetto
Waukegan, US
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Extremely helpful for my dry mouth!
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I absolutely love this gel and was so glad to find it on Amazon!!!
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