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# Fermion: DS3232 Precise RTC (Breakout)

**Type:** Product page · **SKU:** DFR0821 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/fermion-ds3232-precise-rtc-breakout.html ([markdown](https://core-electronics.com.au/fermion-ds3232-precise-rtc-breakout.html.md))

This real-time clock module (RTC) uses the DS3232 chip that integrates a crystal resonator and a temperature compensator, which improves the long-term accuracy of...

## Pricing

- **Price:** $20.25 (inc GST) — $18.41 AUD, exc GST
- **Quantity discounts:** 6+ $17.49 (exc GST) · 12+ $16.75 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 80 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.

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## Description

This real-time clock module (RTC) uses the DS3232 chip that integrates a crystal resonator and a temperature compensator, which improves the long-term accuracy of the module. In the range of -40°C to +85°C, the accuracy of DS3231 remains at ±3.5ppm (±0.3024 seconds/day).

The DS3232 integrates 236Byte SRAM storage that can store data with extremely low power consumption, and it also can be used in scenarios such as low power consumption collection of the Internet of Things.

The device incorporates a battery input and maintains high precision timing when the main power to the device is interrupted. The RTC provides information of seconds, minutes, hours, week, day, month, and year, and it can automatically adjust the date at the end of the month, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. In addition, the RST pin can be used as a push-button input for microprocessor reset.

**Note:** Due to the latest air cargo regulations, the transport audit of special items such as batteries, magnets, and liquids will become very strict, so the RTC module does not come with batteries anymore, please purchase them locally. The button cell model that goes with the module is CR1220.

![](https://core-electronics.com.au/media/wysiwyg/product_images/DFR0821-Connection-Diagram.jpg)

**Connection Diagram**

![](https://core-electronics.com.au/media/wysiwyg/product_images/DFR0821-Board-Overview.jpg)

**Board Overview**

**DS323X Selection Guide**

| **Product Name** | **Fermion: DS3231M MEMS Precise RTC Module** | **Fermion: DS3231 Precision RTC Module** | **Fermion: DS3232 Precision RTC Module** |
|---|---|---|---|
| **SKU** | **[DFR0641](https://core-electronics.com.au/ds3231m-mems-precise-rtc.html)** | **[DFR0819](https://core-electronics.com.au/fermion-ds3231-precise-rtc-breakout.html)** | **[DFR0821](https://core-electronics.com.au/fermion-ds3232-precise-rtc-breakout.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

- Internal integrated crystal resonator, small deviation
- Internal integrated temperature compensator, small temperature drift
- Complete clock calendar function
- Two programmable Time-of-Day alarms
- 236Byte SRAM integrated internally

### Applications

- Event reminder
- MCU external wakeup source
- Clock and alarm output
- IoT data collection and storage

### Specification

- Power Supply Voltage: 3.3V-5.5V
- I2C Address: 0x68
- SRAM:236 Byte (0x14~0x1F)
- Timing Range: 1970 ~ 2100
- Working Temperature: -40°C ~ +85°C
- Timing Accuracy: ±3.5ppm (±0.3024 sec/day)
- Product Size: 22.5\*21mm / 0.89\*0.83 inch

### Documents

- [Product wiki](https://wiki.dfrobot.com/Fermion_DS3232_Precise_RTC_SKU_DFR0821)

### Parts List

- Fermion: DS3232 Precise RTC (Breakout) x1
- 2.54-7P Black Single Row Connector x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/d/f/dfr0821.jpg)