Hi,
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).
Cheers, Geo
RT,目前AD7143的IIC操作没有问题,读取其设备号也正常,但读回来的通道采集数据全部是0,。
之前有块板子能够读取数据,但是每次上电前必须用烙铁刮一下AD7143的引脚方能读回正确数据。
希望有过经验的朋友能指点下。
Hi Allan,
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.
Hello Idowu,
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…
Basically I want to oscillate my sensors so they only detect objects on only one of their sides, not both. Something as what is shown in this pdf in section 2.1 http://www.ti.com/lit/an/snoa926a/snoa926a.pdf
When I say "other capacitive converters…
Hi
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.
http://www.analog.com/en/products/analog-to-digital-converters…
Hi All,
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