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CC1352P7: RAT not accurate without external 32kHz crystal

Part Number: CC1352P7

Hi team,

A customer is using a custom board to develop their proprietary application, their board does not have a 32kHz external crystal, and they found the RAT has an error of several milliseconds after the device wakes up from standby. To my understanding, it is because the RAT synchronizes with RTC after wake up, however the RTC is not accurate because it uses RCOSC. This has been verified by the customer with soldering on a external crystal, which fixes the problem.

The question is, is there a way to achieve the accuracy without a 32kHz external crystal? The power consumption is not important in this application, so the customer thinks of an idea that keeping the RF core in idle and do not enter standby, is it possible?

Another question is that the customer found the timer module of the M4 core is still accurate after waking up, but the RAT was not. What's the difference between the source of these clocks that can lead to the behavior?