FDC1004: extending measuring range

Marc Friedheim

Prodigy 110 points

Part Number: FDC1004

Hello,

Can we extend the input range using an additional known value series capacitor?

Regards,

over 3 years ago

0 John Miller - Sensing over 3 years ago

TI__Mastermind 40295 points

Marc,

It may work, but to be honest, we never envisioned the device would be used that way so its hard to say if it would work.
In the least, you would have to account for the presence of the cap in uC firmware to estimate the actual change in the sensor's capacitance.

Is there a reason your application won't allow you to use the CAPDAC feature?

Regards,
John

0 Marc Friedheim over 3 years ago in reply to John Miller - Sensing

Prodigy 110 points

Hi John, we do use the CAPDAC feature but the sensor's capacitance might be greater than 100pF

0 John Miller - Sensing over 3 years ago in reply to Marc Friedheim

TI__Mastermind 40295 points

Thank you Marc.
John

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FDC1004: extending measuring range