We need application support for the BC118.
We’ve been having issues with about 5% of our BC118s where they don’t initialize properly or start to broadcast.
We’ve noticed that by heating the units in a thermal chamber or with a hot air gun, the BC118s initialize correctly and communicate as expected. If the units are subsequently cooled, they continue to operate correctly, But a power cycle at low temperature (<0°C) will result in initialization failure and failure to broadcast.
Here is some identifying info. regarding the units that exhibit this behavior:
MAC Address Lot Code
Someone on my team has also sent in the following 2 units for RMA (W2223572) which exhibit similar behavior:
Is this a known issue? Or is anything pertaining to initialization extremely time/temperature dependent?
(We have ensured that the 3.3V rail reaches 1.8V in less than 1.5ms per the data sheet.)
Perhaps something is marginal in either the BC118 or our supporting circuitry.
I would like a reference design, but have not found one online.
Any help is appreciated.