[Icc-avr] 32 KHz Crystal start up problems

[Johannes Assenbaum]

Hi Patrick,

at work we have a customer series production that at the start had similar problem with 32kHz crystal, connected to an ADC in this case. Solution was a crystal with lower load cap specified.

hth,

Johannes


> Hope this finds you all well.

> I'm just wondering if anyone has had problems with the 32KHx crystal not
> starting up on the Atmel processors.

> I've use them many times before and never had a problem, but on this latest
> project they quite often don't seem to start up. I have to touch one of the
> legs with a probe etc.. Then they run fine.

> I'm using the mega1280, 3.3Volts.

> I've had problems a long time ago (PACS days Andy) with the wrong crystal
> capacitance on a very low power RTCC, but did not thing the AVRs were that
> sensitive. I've just used a watch crystal from Farnell.

> Thanks in advance for any suggestions,

> Patrick


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