Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[51] Time in rtc being slow....

Status
Not open for further replies.

Azzy anxious

Junior Member level 2
Junior Member level 2
Joined
Jan 28, 2014
Messages
23
Helped
1
Reputation
2
Reaction score
1
Trophy points
3
Activity points
161
Hi
expert I want your help regarding my rtc project,actually i hav worked on DS1307 rtc and able to set time . But My problem is that its nt working properly as time slow downs while comparing wd real time .

Sometimes its working fine bt after some days or week it again slow downs..so can you help me as i can solv ma problem

:shock::shock::shock:
 

The time slows down because the xtal might not be oscillating at the intended 32.768KHz. Check the effective load capacitance which appears across the crystal and see whether it matches with the crystal load capacitance.
If you RTC has a clkout option, measure the oscillating frequency through it.
 
How to check effective load capacitance ..................
 

the DS1307 will drift over time in particular with temperature variations - have a look at
https://www.maximintegrated.com/en/app-notes/index.mvp/id/58

there are temperature compensated RTCs, e.g. the DS3231
**broken link removed**

even then if the system is connected to the internet I would synchronize the time regularly
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top