Switching mechanism FDC2214

Maikel Muller

Hi,

I was wondering how the oscillation is started, thus how does the switch mechanism work? I was not able to find any information about this in the documentation so i hoped someone could help me with this. In particular i'm interested in how the INxA and INxB pins are connected internally. If and how they have a reference to the positive supply voltage or to ground. With this information i hope to get a better understanding where and how paracitic capacitances are created.

I was thinking about a half bridge configuration in which INxA is connected to the positive supply and INxB between the switches, but hope someone could give me some additional information about this.

Thanks in advance,

Maikel

over 9 years ago

0 Evgeny Fomin over 9 years ago

TI__Genius 9300 points

Hello Maikel,

I'm sorry, internal composition of the device is an IP of Ti, and cannot be shared.
Parasitic capacitance of sensor pins is given in the DS (4pF)

0 Maikel Muller over 9 years ago in reply to Evgeny Fomin

Prodigy 160 points

Hey,

Thanks for the reply. Well that's to bad, but understandable.
Yes I'm aware of that 4 pF pin capacitance. I assumed that this 4 pF capacitance is the capacitance between the two sensor pins (4 pF between INxA and INxB) or does each sensor pin have this 4 pF of capacitance.

Maikel

0 Evgeny Fomin over 9 years ago in reply to Maikel Muller

TI__Genius 9300 points

Hi Maikel,

Thank you for your understanding!

INA/B pins have 4pf to GND, and also 4pF between themselves. I hope this helps!

0 Maikel Muller over 9 years ago in reply to Evgeny Fomin

Prodigy 160 points

Hi Evgeny,

I did give me a better understanding of where the parasitic capacitances are located.
Thanks for replies.

Maikel

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Switching mechanism FDC2214