Other Parts Discussed in Thread: MSP430F5529, MSP430FR5994,
A customer is using F437, LFXT1 in LF mode with 32kHz crystal. They are seeing long oscillator startup times at -40C, anywhere from 15 seconds to 1 minute. They have looked at appnote SLAA322, but it doesn't seem to help. In fact, the technique of toggling the XTS_FLL bit seemed to make things worse (longer startup times). The voltage supply is 3.3V. The problem doesn't occur at room temperature.
Are these startup times to be expected at -40 C?
They have tried several different crystals with little difference. Anything else they should look at?