Please provide the schematic, PCB layout, and RTC/AUX initialization code if possible. Please also confirm that the backup battery and external 32 kHz crystal are functioning properly during these fail states. If the crystal fails to oscillate please follow the design guidelines highlighted in SLAA322: www.ti.com/.../slaa322c.pdf What percentage of units are not behaving properly? Please provide further details providing how the three tests (vibration, power cycle, and climate) are performed. Regards, Ryan
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