Apr 07, 2014
05:59 AM
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Apr 07, 2014
05:59 AM
Dear all,
I watch psoc4 specification, Seems to be no way plus 32.768KHz crystal oscillator
P0 [6] pin is an input TTL level clock?
I want to control the clock accuracy of 1% or better
Is there any suggestions?
Thanks.
2 Replies
Apr 07, 2014
06:29 AM
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Apr 07, 2014
06:29 AM
The PSoC4 has no external low frequency oscillator. You can only use an external oscillator, and route its (TTL or CMOS compatible signal) in via a GPIO. Or you use a high frequency crystal, and tune the ILO with this. There is an AppNote for PSoC3/5 explaining this.
Apr 07, 2014
06:57 AM
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Apr 07, 2014
06:57 AM
According to ap note that approach only good to +/- 7.5%, so will not meet
your target of 1%.
Another approach is at production test, use a cal routine -