MCP4022 Microchip Technology Inc., MCP4022 Datasheet - Page 42

• Manufacturer Part Number: MCP4022
• Description: Low-cost Nv Digital Pot With Wiperlock Technology
• Manufacturer: Microchip Technology Inc.

MCP4021/2/3/4
6.0
Digital potentiometer applications can be divided into
two categories:
• Rheostat configuration
• Potentiometer (or voltage divider) configuration
Figure 6-1
resistors.
FIGURE 6-1:
DS21945E-page 42
R
R
R
R
Note 1: The wiper resistance is tap dependent.
S
S
S
S
RESISTOR
B
A
shows a block diagram for the MCP402X
N = 63
N = 62
N = 61
N = 1
N = 0
That is, each tap selection resistance
has a small variation. This variation
effects the smaller resistance devices
(2.1 kΩ) more.
R
R
R
R
R
W
W
W
W
W
Resistor Block Diagram.
(1)
(1)
(1)
(1)
(1)
3Eh
3Fh
3Dh
01h
00h
Analog
Mux
W
Step resistance (R
setting to the next. This value will be dependent on the
R
typical step resistances for each device.
The total resistance of the device has minimal variation
due to operating voltage (see
Figure 2-27
TABLE 6-1:
Terminal A and B, as well as the wiper W, do not have
a polarity. These terminals can support both positive
and negative current.
MCP402X-203E
MCP402X-503E
MCP402X-104E
MCP402X-504E
AB
Part Number
value that has been selected.
or
Figure
TYPICAL STEP RESISTANCES
S
) is the resistance from one tap
2-37).
© 2006 Microchip Technology Inc.
Total (R
Typical Resistance (Ω)
10000
50000
2100
5000
Figure
AB
Table 6-1
)
2-6,
Step (R
Figure
158.73
793.65
33.33
79.37
shows the
2-17,
S
)