Hi TEAM,
From the datasheet of FDC2112, on Page 17, how to get the vale of 1.8ms,3.2ms,0.75ms?
Thanks a lot
Matthew Chen
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Hi TEAM,
From the datasheet of FDC2112, on Page 17, how to get the vale of 1.8ms,3.2ms,0.75ms?
Thanks a lot
Matthew Chen
Hello Mathew,
Fref is the clock frequency after the dividers
It seems like when they put these calculations in the datasheet, a consistent Fref was not used and the numbers were not double checked. If you use a 10Mhz Fref and the same register settings from the datasheet, you get the following:
0.2ms (sensor-activation time) + 0.82ms (conversion time) + 0.001ms (channel-switch delay) = 1.21ms per channel
Best Regards,
Justin Beigel
Hi Justin,
thanks for your kindly reply.
What's the value of CHx_SETTLECOUNT, CHx_RCOUNT and fREFx when you calculate? I know how to calculate the delay time.
Could you tell me where is the '' register settings'' you mentioned in the datasheet?
Matthew
Hello Mathew,
In the paragraph you quoted from the datasheet, it mentions an RCOUNT of 512 and a SETTLECOUNT of 128.
I then chose to use 10MHz for the Fref in my calculations. This is just an example number and doesn't correlate to an actual application.
Best Regards,
Justin Beigel