> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # DS3231M MEMS Precise RTC **Type:** Product page · **SKU:** DFR0641 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia) **Page:** https://core-electronics.com.au/ds3231m-mems-precise-rtc.html ([markdown](https://core-electronics.com.au/ds3231m-mems-precise-rtc.html.md)) This precise RTC adopts DS3231M chip, which integrates MEMS resonator and temperature compensator. Compared to quartz crystal clock, the real-time clock reduces... ## Pricing - **Price:** $11.75 (inc GST) — $10.68 AUD, exc GST - **Quantity discounts:** 6+ $10.15 (exc GST) · 12+ $9.72 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 7 today, and up to 1 more in 8–12 days. ## Restrictions Restrictions apply to this equipment as it uses button/coin cell batteries: - The equipment is intended to be used in trades, professions or industries - The equipment is not intended for sale to the general public - The equipment is not intended to be used where children are present - You are aware that this equipment may not meet child safety testing requirements as it is not intended to be used by consumers or general public, but rather, is intended to be used in trades, professions or industries in conjunction with the limitations and restrictions listed above - You are aware that these restrictions are due to a change in [A](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence)[ustralian legislation in 2022](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence) for button/coin cell batteries ![Button Battery Warning](https://core-electronics.com.au/attachments/uploads/iec-button-battery.png) A declaration of use will need to be submitted during checkout. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=DFR0641:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/DFR0641:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description This MEMS Precise RTC Breakout Board adopts DS3231M chip, which integrates MEMS resonator and temperature compensator. Compared to quartz crystal clock, the real-time clock reduces the risk of mechanical failure. Therefore, it can be used in a highly vibrating environment.Within -45°C to +85°C, the accuracy of the DS3231M is ±5ppm (±0.432 s/D). The RTC based on MEMS has already passed both shock tests and vibration tests that certified by ACE-Q100. It can withstand 2900g mechanical shock (JESD22-B104C Condition-H) and 20g variable frequency vibration (JESD22-B103B Condition-1). The DS3231M can be powered by a coin cell battery and can still maintain accurate timing even the mains are disconnected.[ RTC ](https://www.dfrobot.com/category-232.html)provides information about seconds, minutes, hours, days, months, and years. It can automatically adjust the end date of the month and the leap year correction. The clock format can be 24 hours or 12 hours with AM/PM indication. It provides two programmable calendar alarms and one 1Hz square wave output. In addition, the RST check pin can be used as a key input for microprocessor reset. **Note:** According to the latest Air Transport Regulations, the batteries, magnets and liquids transport will be very stringent, so the cell battery CR1220 will not come with the module any more. Please buy it from the local supermarket. **DS323X Selection Guide** | **Product Name** | **Fermion: DS3231M MEMS** **Precise RTC Module** | **Fermion: DS3231 Precision RTC Module** | **Fermion: DS3232** **Precision RTC Module** | |---|---|---|---| | **SKU** | **[DFR0641](https://www.dfrobot.com/product-1991.html)** | **[DFR0819](https://www.dfrobot.com/product-2313.html)** | **[DFR0821](https://www.dfrobot.com/product-2304.html)** | | **Storage** | None | None | 236Byte | | **Integrated R****esonator** | MEMS | XTAL | XTAL | | **Timing Current** | 2000nA | 840nA | 1500nA | | **Timing Precision** | ±5ppm (±0.432s/d) | ±3.5ppm (±0.3024s/d) | ±3.5ppm (±0.3024s/d) | | **Operating Voltage** | 3.3V-5.5V | 3.3V-5.5V | 3.3V-5.5V | | **Operating Temperature** | -45°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | | | Integrated MEMS resonatr, reducing the risk of mechanical failure, suitable for use in strong and frequent vibration. | A RTC module with integrated crystal resonator, featuring a higher precision and a lower power consumption, suitable for use in the occasion in demand of high precision and low power. | A RTC module with integrated crystal resonator, equipped with 236Byte SRAM storage inside, enabling it to store data at an extremely low power consumption, suitable for low-power loT applications requiring real-time clock. | ### Features - High anti-vibration - Internal MEMS resonator and temperature compensator - High precision: ±5ppm (±0.432 s/D) at -45°C to +85°C - Clock calendar - 2 programmable calendar alarms ### Specification - Operating Voltage: 3.3V-5.5V - I2C Address: 0x68 - Timing Range: 1970~2100 year - Operating Temperature: -40°C to +85°C - Timing Precision: ±5ppm (±0.432 s/D) - Dimension: 22.5\*21mm / 0.886\*0.827inch ### Projects Project 1: [**Making an Arduino OLED Ring Clock**](https://community.dfrobot.com/makelog-308274.html) The hardwares you need to do this project: [0.91”128x32 I2C OLED Display](https://www.dfrobot.com/product-2019.html)x1 [DS3231M MEMS Precise RTC](https://www.dfrobot.com/product-1991.html)x1 [Beetle](https://www.dfrobot.com/product-1075.html)x1 3.7V Lithium Battery Charger x1 1000mah 3.7v Lithium Battery x1 Needle x1 A piece of elastic braid tape ### Documents 22. [Product wiki](https://wiki.dfrobot.com/DS3231M%20MEMS%20Precise%20RTC%20SKU:%20DFR0641) ### Parts List 24. DS3231M MEMS Precise RTC x1 25. 2.54-7P Pin x1 ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/d/f/dfr0641-1.jpg)