Rainbow Electronics DS1666S - Manual (Page 3)

DS1666
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PIN DESCRIPTIONS
V
CC
- Power Supply. The DS1666 will support supply voltages ranging from +4.5 to +5.5 volts.
GND - Ground Terminal.
V
B
- Negative Bias. The DS1666 will support a negative bias ranging from 0 to -5 volts.
H - High-Terminal of Potentiometer. It is not required that this terminal be connected to a potential
greater than the V
L
terminal. Voltage applied to the V
H
terminal can not exceed the power-supply
voltage, (V
CC
), or go below the negative bias, (V
B
).
V
L
- Low-Terminal of Potentiometer. It is not required that this terminal be connected to a potential less
than the V
H
terminal. Voltage applied to the V
L
terminal cannot exceed the power-supply voltage, (V
CC
),
or go below the negative bias (V
B
).
V
W
- Wiper of the Potentiometer. Its position on the resistor array is controlled by the 3-terminal control
port. Voltage applied to the wiper cannot exceed the power-supply voltage, V
CC
, or go below the
negative bias (V
B
).
CS - Chip Select. The CS input is used to activate the control port of the DS1666. This input is active
low. When in a high-state, activity on the INC and U/ D port pins will not affect or change wiper
position.
INC - Wiper Movement Control. This input provides for wiper position changes when the CS pin is low.
Wiper position changes will occur one position per high-to-low transition of this input signal. Position
changes will not occur if the
CS pin is in a high-state.
U/ D - Up/Down Control. This input sets the direction of wiper movement. When in a high-state and CS
is low, any high-to-low transition on INC will cause a one position movement of the wiper towards the
V
H
terminal. When in a low-state and CS is low, any high-to-low transitions on INC will cause the
position of the wiper to move towards the V
L
terminal.