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Clkin voltage level
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Clkin voltage level

clh23047 posted on 19 Sep 2012 8:03 AM PST
Top Contributor
65 Forum Posts

Hello, I changed the crystal(19.2MHz) to oscillator. The voltage amplitude of the clock signal(clkin) on my board is 0.8V(19.2MHz)and the board is not working now. My question is that what should the voltage level of the clock be. 0.8V is too low or sufficient?

Thank you 

Lehua Chen  




Re: Clkin voltage level

clh23047 posted on 19 Sep 2012 10:04 AM PST
Top Contributor
65 Forum Posts

I check it by applying external clock to the Clkin pin on the FX3 evaluation board. The amplitude of the clock (19.2MHz) should be larger than 1.8V. Otherwise, the chip will not work. Thanks

Lehua Chen



Re: Clkin voltage level

occupy posted on 19 Sep 2012 01:59 PM PST
Top Contributor
61 Forum Posts

many times  mine is  0.5-1.5V  or  less  than 2v     ,but  it is  work  normal



Re: Clkin voltage level

RSKV posted on 24 Sep 2012 05:18 AM PST
Cypress Employee
655 Forum Posts

I am seeing around 0.8V on my working board.

Thanks,

sai krishna.






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