Programming instructions

Pullup
 National Instruments Corporation 2-37 Multisim Component Reference Guide
its resistance will increase by 10k steps until it reaches the potentiometer’s maximum value of
200k ohms.
 To decrease the value using the keyboard, press and hold SHIFT and press the identified key.
For example, say the potentiometer is set to 45%, the increment is 5% and the key is R. Press
R, and the setting increases to 50%. Press R again, and it increases to 55%. Press
SHIFT and R,
and the setting decreases to 50%.
 To adjust the potentiometer’s value using the mouse:
1. Hover the cursor over the device to display its slider bar.
2. Drag the slider to the right to increase the value, or to the left to decrease the value.
Characteristic Equation and Model
The potentiometer is simulated using two resistors, R
1
and R
2,
whose values are computed
using the potentiometer’s initial settings.
where:
R
1
= r
R
2
= Resistance – r
2.16 Pullup
This component is used to raise the voltage of a circuit to which it is connected. One end is
connected to Vcc. The other end is connected to a point in a logic circuit that needs to be
raised to a voltage level closer to Vcc.
Setting
Resistance
100
*
r =
ComponentRef.book Page 37 Thursday, December 7, 2006 10:12 AM