About nikhilgopale

nikhilgopale · 2017-08-09

Posted on August 10, 2017 at 08:56Hi Everyone,I am working on RTC with stm32f746g controller. I tried number of option but i am not getting accurate time.After some time rtc is getting lag of 4 to 5 seconds and it keep on lagging in time.I am using ...

nikhilgopale · 2017-08-12

Posted on August 12, 2017 at 14:23 Hi , Please check attached schematic and layout of the board. Let me know hardware point of view it is correct or not. Also tell me how much Cs i should consider while calculating CL1 & CL2 values.Now i am us...

nikhilgopale · 2017-08-11

Posted on August 11, 2017 at 10:18Prescaler values are set correctly which is given below.RTC_ASYNCH_PREDIV --> 0x7F RTC_SYNCH_PREDIV --> 0x00FF It is mentioned in ST application note AN4759.I am using 32.768Khz crystal with load capacitance 12.5pF ...

nikhilgopale · 2017-08-11

Posted on August 11, 2017 at 10:10In RCC_BDCR register LSE_ON & LSE_EN bit is set i am using LSE as a clock source for RTC (RCC_RTCCLKSOURCE_LSE ).Configured RTC prescaler values so i should get 1 Hz frequency as mentioned below . RTC_ASYNCH_PREDIV ...

nikhilgopale · 2017-08-10

Posted on August 10, 2017 at 14:05 Hi Waclawek.Jan, In 12 hours i am getting almost 15 minutes time lag. As per formula (deviation / total elapsed time) * 1,000,000 it is 20833 ppm. I am using AB38T-768KHZ crystal.

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STM32746G RTC problem

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