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LP-CC1311P3: Reset with start of RF core

Part Number: LP-CC1311P3
Other Parts Discussed in Thread: CC1311P3, SYSCONFIG

We want to design a transmitter (transmitter only, for radio direction finding) with CC1311P3. On LP-CC1311P3 with Your demo software and changes for only turning on the transmitter, its working fine. Our own design is (nearly) strict to Your demo board. Some values vary, the components we use are 0603 and not 0402 (we have to solder by hand). Our system works fine with the demo software, as long as we use the main CPU. Ports are working. But with the first call of the RF core, there is an instant reset. Can You interpret this behavior?

Best regards from Germany