> **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

# Gravity: I2C SD2405 RTC Module

**Type:** Product page · **SKU:** DFR0469 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/gravity-i2c-sd2405-rtc-module.html ([markdown](https://core-electronics.com.au/gravity-i2c-sd2405-rtc-module.html.md))

We're glad to introduce a new member in Gravity family: Gravity I2C SD2405 RTC module. This is an extremely accurate I2C real-time clock (RTC) with crystal compensation...

## Pricing

- **Price:** $14.45 (inc GST) — $13.14 AUD, exc GST
- **Quantity discounts:** 6+ $12.48 (exc GST) · 12+ $11.95 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 1 today, and up to 300 more in 8–12 days.

## How to buy

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- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

We're glad to introduce a new member in Gravity family: Gravity I2C SD2405 RTC module. This is an extremely accurate I2C real-time clock (RTC) with crystal compensation, inner chargeable battery. The SD2405AL is available in industrial temperature ranges.

The SD2405AL is dual power supply system. When the primary power supply goes down to an assigned value or resumes from low power, the system can switch between the primary power supply and battery automatically. Even there is no external power, it can still work for 5~8 years, 1uA ultra-low power consumption (inner battery, Ta=25°C).

The SD2405AL can generates various periodic interrupt clock pulses lasting for long period (one year), and three alarm interrupts can be made by year, month, date, days of the week, hours, and minutes, seconds. It also provides a selectable 32.768KHz~1Hz clock output for an external MCU. The product incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. A 12-bytes general SRAM is implemented in the SD2405AL.

Gravity SD2405 RTC can work as data logger, timer alarm clock and other time application. It is an ideal choice for timing project.

### Specification

- Operation voltage range:3.3V~5.5V.
- Low-power:typical 1uA (inner battery, Ta=25°C)
- Timing Range: To 2099 (with leap year compensation)
- Accuracy ±5ppm from -40°C to +85°C.
- Fast (400kHz) I2C Interface(4.5~5.5V).
- Real-Time Clock Counts Seconds, Minutes,Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100.
- Time-of-Year,Month,Day,Week,Hour,Minute,Second Alarms.
- Programmable Square-Wave Output:32768hz,4096hz...1hz..1/16hz.
- Countdown timer interrupt.
- High precision time trimming circuit.
- 12-hour/24-hour time display selectable
- Dimension: 35.50 \* 22.00(mm)/1.4 \* 0.87 inches
- Weight: 6g
 
### Documents

- [Product WIKI ](https://www.dfrobot.com/wiki/index.php/Gravity:_I2C_SD2405_RTC_Module_SKU:_DFR0469)
- [More Documents](https://www.dfrobot.com/wiki/index.php/Gravity:_I2C_SD2405_RTC_Module_SKU:_DFR0469#More_Documents)
 
### Parts List

- Gravity: I2C SD2405 RTC Module x1
- Gravity I2C 4-Pin Sensor Cable x1
- XH2.54-5pin header x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/6/w/6w4a5214-900x600.jpg)