4 ms·
I know auxiliary micros are everywhere these days, but there is very little chance an RTC is implemented this way. RTCs are by design extremely simple, low powe
by marcan_42 5y ago
I know auxiliary micros are everywhere these days, but there is very little chance an RTC is implemented this way. RTCs are by design extremely simple, low power CMOS logic since they need to run off of a button cell for a decade. It's just a bunch of counters chained together.
- nousermane 5y agoChip in question is power-management IC, with RTC being just one function of. Others are (programmable) power sequencing and suspend/resume state machine, all accessible via same I2C interface. Here is datasheet: http://rockchip.fr/RK808%20datasheet%20V1.4.pdf http://rockchip.fr/RK808%20datasheet%20V1.4.pdf
- marcan_42 5y agoYes, and the RTC portion is going to be part of a separate always-on power domain and designed to consume single-digit microamps of power (5uA for this one). It's not going to involve a microcontroller.
- dTal 5y agoBut not necessarily the part that, on-demand, converts whatever kind of tick the RTC uses to human-convention dates.
- marcan_42 5y agoThat doesn't really make much sense as a design. If they were going to return calendar dates, they'd count in calendar dates. I can't think of a reason why someone would implement something like that, it's just not how these things are designed.