| ??? 11/14/09 11:37 Read: times |
#170801 - Kiran is right... Responding to: ???'s previous message |
Reading the RTC too frequently may prevent it from keeping correct time. Or alternatively, why don't you use the SQW OUTPUT FREQUENCY as the interrupt to the uC & after (say) 0.5 sec it reads the RTC.
If everything fails try this: Separate the power supply of the RTC & let it be run forever on the car battery, while the on/off switch controls the power to the rest of the circuit including LCD & backlight etc. The Active Supply Current for DS1307 is only 1.5mA, car battery wont mind... this way the RTC will be less subjected to on/off but that should be enough for Govt work ;) -Regards, Munish |
| Topic | Author | Date |
| RTC problem | 01/01/70 00:00 | |
| According to the RTC datasheet... | 01/01/70 00:00 | |
| what's there in place | 01/01/70 00:00 | |
| My past experience with RTC | 01/01/70 00:00 | |
| Kiran is right... | 01/01/70 00:00 | |
| new problem | 01/01/70 00:00 | |
| Stopped oscillator? | 01/01/70 00:00 | |
| It will help if | 01/01/70 00:00 | |
This could be the reason... | 01/01/70 00:00 | |
| @ kiran,munish | 01/01/70 00:00 | |
| Minimize I2C activity | 01/01/70 00:00 | |
| One step further | 01/01/70 00:00 |