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Tool/software:
Currently using the CC1120 transceiver as a dedicated sub-gig receiver in a larger embedded IoT device. The device in question has two alternate power sources, an external (+12V DC) and internal (Lithium Ion) option. The external option regulates down to 3.6V and certain sub-systems, including the CC1120, run off of that rail. Alternatively, the regulated voltages are by passed when running on the internal Lithium Ion battery. Effectively the CC1120 runs directly from this Lion voltage.
The preface above leads into the question, which regards the CC1120 electrical characteristics. As described, the LION battery is directly feeding the supply rail for the CC1120, and the absolute maximum rating for that device is 3.9V. As a result of the lithium ions max charge voltage of 4.2V we have a system in place that maintains the battery not charge over 3.9V (the unit in FW is 3.87V to allow some measurement error.) Recently, while reviewing the datasheet it was noted that while the Absolute maximum voltage is 3.9V, the recommended condition is 3.6V. This implies our system is running the CC1120 a condition described as" ..not implied." in the datasheet. Further, the note under Absolute Maximum Ratings section states. "Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability."
Based on the provided information above, can we get insight on what device reliability issues we might face? There is ample opportunity for our device to live in the 3.6 to 3.87V range for meaningful amounts of time.