PSoC4 clock accuracy

[ShSh_291626]

 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.

[HeLi_263931]

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.

[ETRO_SSN583]

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 -