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PSoC 4 MCU

ShSh_291626
New Contributor

 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.

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2 Replies
HeLi_263931
Honored Contributor II

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.

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ETRO_SSN583
Esteemed Contributor

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 -

   

 

   

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