Real Time Clock(RTC) based on DS1307 Features - Sunrom ...

For more products visit our website http://www.sunrom.comDocument: Datasheet Date: 11-Jan-12 Model #: 1246 Product’s Page: www.sunrom.com/p-1089.html<strong>Real</strong> <strong>Time</strong> <strong>Clock</strong>(<strong>RTC</strong>) <strong>based</strong> on DS1307This board is <strong>Real</strong> <strong>Time</strong> <strong>Clock</strong> <strong>based</strong> on mostpopular <strong>RTC</strong> IC DS1307 which can maintainclock & calendar information. Life of 3V batteryis 10 years which maintains accurate clock evenwithout any external power. The clock/calendarprovides seconds, minutes, hours, day, date,month, and year information.The Interface to board is simple I2C with SCKand SDA pins which can be interfaced with anymicrocontroller easily.Features• <strong>Real</strong>-<strong>Time</strong> <strong>Clock</strong> (<strong>RTC</strong>) Counts Seconds,Minutes, Hours, Date of the Month,Month, Day of the week, and Year withLeap-Year Compensation Valid Up to2100• 56-Byte, Battery-Backed, Nonvolatile(NV) RAM for Data Storage• I2C Serial Interface• Automatic Power-Fail Detect and SwitchCircuitry• Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running• Battery Life of CR2032 is around 10years.Working and further information is in datasheet of IC is at below linkhttp://www.sunrom.com/files/DS1307.pdfNote: DHL courier does not allow us to ship Lithium battery CR2032 with board. So if you areordering from out of India, we will be unable to ship battery with board. You shall have to arrange itat your country after receipt of this board. It is easily available at your general store.

Board SchematicVCCVCCVCCC1CN1SIP4-+4321VCCSDASCLVCCR110K+ C2100uFR210KU1DS130756SDAX11SCLVCC 8Y1100nSQW/OUT7VBAT32X24GNDBT1BATT CR203232.768 KhzSunrom Technologies http://www.sunrom.comTitleCode<strong>RTC</strong> <strong>based</strong> on DS13071246 Rev 1Date: Saturday, December 10, 2011Sheet 1 of 1Sample Code AT89S52Software for this example programwith KEIL C51.The main loop justread data from <strong>RTC</strong>and keep into array (RCT_ARR[7])which consist of second,minute,....year. After all data readedit will send to PC for display withhyper terminal program every 1second.Download full source code fromhttp://www.sunrom.com/files/1246.zip//---------------------------------------// Main program//---------------------------------------void main(void){InitSerial();// Initialize serial port//-----------------------------------// Setup time and enable oscillator//-----------------------------------Read<strong>RTC</strong>(&<strong>RTC</strong>_ARR[0]);<strong>RTC</strong>_ARR[0] = <strong>RTC</strong>_ARR[0] & 0x7F; // enable oscillator (bit 7=0)<strong>RTC</strong>_ARR[1] = 0x59; // minute = 59<strong>RTC</strong>_ARR[2] = 0x05; // hour = 05 ,24-hour mode(bit 6=0)<strong>RTC</strong>_ARR[3] = 0x01; // Day = 1 or sunday<strong>RTC</strong>_ARR[4] = 0x30; // Date = 30<strong>RTC</strong>_ARR[5] = 0x08; // month = August<strong>RTC</strong>_ARR[6] = 0x05; // year = 05 or 2005Write<strong>RTC</strong>(&<strong>RTC</strong>_ARR[0]); // Set <strong>RTC</strong>//-----------------------------------while(1){Read<strong>RTC</strong>(&<strong>RTC</strong>_ARR[0]);putchar(0x0C); // clear Hyper terminalprintf("Day : %s\r\n",Int2Day(<strong>RTC</strong>_ARR[3]));printf("<strong>Time</strong> : %02bX:%02bX:%02bX\r\n",<strong>RTC</strong>_ARR[2],<strong>RTC</strong>_ARR[1],<strong>RTC</strong>_ARR[0]);printf("Data : %02bX-%s-20%02bX",<strong>RTC</strong>_ARR[4],Int2Month(<strong>RTC</strong>_ARR[5]),<strong>RTC</strong>_ARR[6]);//}}DelayMs(1000);// delay about 1 second2Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com