In this article we will show how to interface the FOX board to a Real Time Clock chip from Dallas/Maxim type DS through the I2C protocol. DS, DS Datasheet, DS Trickle Charge Timekeeping Chip, buy DS Photograph. DS Dallas Semiconductor IC. Real Time Clock – DS This is a VERY simple tutorial on how to use the DS Real Time Clock with an Arduino, or Versilino, board. I will walk you.

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To prevent it we posed the pull-up resistor of Ohms. The three pins for the interface should avoid to use the internal pull-up resistors of the Arduino. See the datasheet for full specifications and a circuit.

To prevent that, the DS has a buffer to store the clock data.

The playground is a publicly-editable wiki about Arduino. The Year eallas of the DS is only two digits In particular regarding the ground plane to build in the surrounding of the quartz itself. This line is bidirectional, so when the FOX needs to write data in the peripheral it drives the line, however when the FOX has to receive data from the peripheral, it sets its line in input mode.

Some schematics on the internet have pull-up resistors on the three interface lines. The standard date and time functions like: Sources for Electronic Parts. Acme Systems srl provided this documentation “as is” without warranty or guarantees of any kind. For more info pleae look at this Forum Post. The most used name is “3-wire interface”. The page at maxim for the DS with all information and datasheet: Infact, with the DS you could change the lithium battery with a rechargeable battery or a supercap if you want, and the chip has the capaility to recharge it when the main power supply is switched on.


In the proposed circuit as an application example, we used a common lithum battery type CR Board Setup and Configuration.

5PCS DS DSN DIP-8 Trickle-Charge Timekeeping DALLAS Real-Time Clock/RTC | eBay

The shipping office is closed from 21 dec up to 7 jan In particular for the Dallas DS RTC chip the support is already enabled in the memory image released with the FOX board, sowhen you dalllas the chip as explained dlalas the following, it will be immediately used by the operating system without any software adaptation or script changing. To avoid the current flow towards the battery we interposed a series diode D1 and the limiting current resistor R1 of Ohms in such a way that the current can flow from the battery to the RTC and not on the other way.

So the code has to detect that condition to prevent an extra clock pulse. The lithium batteries cannot be recharged hence it is necessary to block the DS chip in its recharge battery function. The chip will be read by the Linux system through the I2C interface signals.

A crystal of This circuit has pull-down resistors which are an extra, in many cases they are not needed.


Terms of use of this documentation. The chip has 31 bytes of ram. The last clock pulse of the address using the rising edge is also the first clock pulse of the data to read using the falling edge.

To guarantee the best stability of the timing it is recommended to follow the hints presented in the datasheet of the DS chip in terms of correct positioning of the Hz quartz. Other schematics use two 22pF with the crystal.

Related Hardware and Initiatives. Cheap modules with the DS and DS have often problems with the crystal and the voltage. During reading, the clock could rollover.

Add a Dallas DS1302 I2C Real Time Clock

This is a cheap module with the DS We not provide any direct support for the Open Source software which can running on our board but, through these pages and forum posts, we provide all of the information required to obtain the sources, install, use and update the Open Source software available on Internet. At this moment there is no official library for date and time functions for the Arduino.

The code below contains basic interface functions for the DS That is also wrong. The data in this ram will get lost if the Arduino is off, and the battery or supercap gets empty.