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Is there any internal resistor for the digital I/O of my device?

Emam

Jul 7, 2014
63
Joined
Jul 7, 2014
Messages
63
Dear all,

I have a new electronic device (torque sensor) which has a 25 pins digital I/O connector.
The characteristics of this connector is shown in attached.

I would like to use one of the pins (pin 15) which is an input, and I would like to send pulses of 24 VDC to it.
In fact I need to send 24 VDC to this pin to start the operation of my sensor.

Question:
I would like to know, which value of current I should send at 24 VDC to this input ?
In the data sheet ints written that the max input current is 8 mA. Is this the max current I should send?
Or this is the current controlled by an internal resistor at this pin?



Many thanks in advance
 

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BobK

Jan 5, 2010
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You do not send current to an input. You place a voltage on the input and it draws whatever current it wants. In this case, the linked specs indicate that it will draw 8mA at 24V. So your 24V signal must be capable of delivering 8mA. There is no need for a resistor to limit current.

Bob
 

Emam

Jul 7, 2014
63
Joined
Jul 7, 2014
Messages
63
Thank you very much.
So actually this 8 mA is the cuurent comsumption at the input pin.
Bests regards
 
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