> **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

# SD2405 Real-Time clock Module(Arduino Gadgeteer Compatible)

**Type:** Product page · **SKU:** TOY0021 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/sd2405-real-time-clock-module-arduino-gadgeteer-compatible.html ([markdown](https://core-electronics.com.au/sd2405-real-time-clock-module-arduino-gadgeteer-compatible.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## How to buy

- **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

Introduction

 A real-time clock (RTC) is a computer clock (most often in the form of an integrated circuit) that keeps track of the current time.The term is used to avoid confusion with ordinary hardware clocks which are only signals that govern digital electronics, and do not count time in human units. Compared with the cheap RTC module in the market now, this SD2405 Real-time clock module is low power consumption and high accurate solution. The typical power consumption is about 1.0uA. It intgerated the crystal and it ensure the accuracy of clock is about 5ppm.That means even if keep running one year, the deviation of this RTC module should be less than 2.5 minutes without the calibration. It supplies the time data via I2C interface and the time format is configurable to be switched between 12 hours and 24 hours. However, another good feature is the time alarm function via interrupt event output. So this RTC solution should be worth to try. It integrated with a rechargeable battery, which can be used for about 5-8 years. The module will automatically charge the battery inside when plugin the external power supply from "+5" pin. This module supports both 3.3v/5v,which makes it compatible with both Gadgeteer/Arduino DUE 3.3v and Arduino Standard 5v systems. Including 5 Pin headers supplies the easiest way for the module to be connected to Arduino microcontrollers. Specification - External power range: 3.3~5.5v
- Supply fixed time alarm via interrupt output
- Typical power consumption: 1.1uA
- Selectable 12/24 hours format
- Interface: I2C and interrupt output
- Accurancy: about ±5ppm
- Deviation: less than 2.5 minutes every year
- Pin ESD > 4KV
- 0.5s IIC Bus auto reset function to avoid from getting stuck
- Industrial grade
- Temperature range: -40~+85℃
- Switch for disconnecting the I2C pull-up resistors
- Size:36x31x14mm
 
 Shipping List - SD2405 Real-time clock Module(Gadgeteer Compatible)1unit
- Cable for Gadgeteer1unit
 
 Documents - Wiki Doc
- Schematic
- SD2405 Datasheet

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/imgp8323-1.jpg)