Does the pad on the underside of the AD7143 (QFN-like package) have to be grounded for the IC to work?
I have connected everything up except this pad, and the chip won't respond over I2C (no acknowledge bit).
The AD7746 cannot be used for single electrode sensing; shorting the Excitation pins to the CIN pins will saturate the readings of the sensor.
The AD7747 is the only single ended device in this family, but you could look at the CapTouch…
Sorry for the delay in getting back to you. If you need multiple sensor inputs then have you considered maybe the AD7142 or AD7143 parts? These parts have multiple sensor inputs so they would reduce the need to use multiple AD7746 chips.
For a project, I want to differentially sense multiple capacitive channels (non-touch application), and I am thinking of using 6-7 units of the AD7143 chipset. I was wondering if anybody knew a good multiplexer to switch between these chips…
there are couple of parts that provide more number of channels but they are limited to applications such as single electrode capacitance sensors or have touch sensor type of applications.
I am trying to figure out how to control my AD7150 eval board using an external microcontroller (Cypress PSOC 4 Pioneer dev. kit). Does anyone have a step-by-step solution to do this, preferably with application code in the C programming language…