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The default option is based on i.MX6UL's native RTC. The simplified block diagram of this solution is depicted in the following image.
When the system is powered on, the battery is being recharged. When the system is powered off, on-board battery powers SNVS domain of i.MX6UL processor that includes native RTC. Under these conditions, the typical current drawn from the battery is TBD uA. In case a 17 mAh battery is used (i.e. Panasonic ML-1220/V1AN), battery life is about TBD. This solution is quite simple and cheap. However, it TBDthe timekeeping operation time is relatively short. In case a longer timekeeping operation time is required, it is possible to not populate the on-board battery and to connect a bigger one to the connector J56. For more information, please contact [mailto:sales@dave.eu Sales department].
==ST M41T83 (alternative option)==
This option is based on [ST M41T83 http://www.st.com/en/clocks-and-timers/m41t83.html] RTC. The simplified block diagram of this solution is depicted in the following image.
[[File:TBD.png|thumb|center|600px|Alternative RTC implementation]]
Typical current drawn from the battery is TBD uA, when the system is powered off [1]. Thus expected battery life is TBD.
This solution is more expensive but guarantees a longer timekeeping operation time, because M41T83 power consumption is very low. In any case, it is possible to not populate the on-board battery and to connect a bigger one to the connector J56 to achieve an even longer operation time. For more information, please contact [mailto:sales@dave.eu Sales department].
It is worth to remember that this circuit implementation prevents the use of so-called [[tablet mode|Supported_power_mode_transitions_(SBC_Lynx)]], beacuse PMIC is not powered when the system is powered off.
[1] This consumption largely varies depending of RTC configuration. This figure refers to the following configuration:
TBD
