My customer has the following doubt; does anybody know of any other technique to compensate the RTC of TWL4030. The purpose of this mail is to explore the techniques available for compensation of drift in RTC Timing. The conventional approach suggested in http://focus.ti.com/lit/an/swca024/swca024.pdf is by gating the high frequency clock with the 32KHz clock as shown in the below diagram. Then, obtaining the count of the high frequency clock after gating. The count thus obtained indicates the degree of the drift. This approach requires an additional hardware for Anding 32KHz and high frequency clock. We would like to know TI experts’ opinion, on any other techniques using which we can generate the compensation values for the RTC-TWL4030 assuming both 32KHz and high frequency clocks are available and the best suited technique with and without additional hardware for computing the compensation values.
My customer has the following doubt; does anybody know of any other technique to compensate the RTC of TWL4030.
The purpose of this mail is to explore the techniques available for compensation of drift in RTC Timing. The conventional approach suggested in http://focus.ti.com/lit/an/swca024/swca024.pdf is by gating the high frequency clock with the 32KHz clock as shown in the below diagram. Then, obtaining the count of the high frequency clock after gating. The count thus obtained indicates the degree of the drift. This approach requires an additional hardware for Anding 32KHz and high frequency clock. We would like to know TI experts’ opinion, on any other techniques using which we can generate the compensation values for the RTC-TWL4030 assuming both 32KHz and high frequency clocks are available and the best suited technique with and without additional hardware for computing the compensation values.
I am not aware of any other technique. Actually, I am not aware of anyone using this. You (your customer) is probably the first one thinking of this.
Regards,
Gandhar.
In order to utilize the method you (AFAIK) don't need any external AND-gate in case you are using the TWL4030/TPS65950 together with an OMAP-device, since Timer1 in the OMAP Timer IP block have the ability to do this measurement/gauging of the 32kHz signal using the high speed (12MHz-26MHz clock) system clock . More information to be found in: http://focus.ti.com/lit/ug/sprufa9b/sprufa9b.pdf
Best regards - Good luck Søren
Søren Steen Christensen - SSC Solutions ApS - Web: www.ssc-solutions.dk
Hi Søren,
Thank you for pointing to the OMAP document.
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