MCP4012 Microchip Technology Inc., MCP4012 Datasheet - Page 38

• Manufacturer Part Number: MCP4012
• Description: Low-cost 64-step Volatile Digital Pot
• Manufacturer: Microchip Technology Inc.

MCP4011/2/3/4
5.3
The CS pin is High-Voltage (V
MCP402X. This allows the MCP401X to be used in
MCP402X applications without needing to change
other portions of the application circuit.
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:
DS21978C-page 38
R
R
R
R
Note 1: The wiper resistance is tap dependent.
S
S
S
S
CS High Voltage
RESISTOR
B
A
shows a block diagram for the MCP401X
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
IHH
) tolerant, like the
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 2-36
TABLE 6-1: TYPICAL STEP RESISTANCES
Terminal A and B, as well as the wiper W, do not have
a polarity. These terminals can support both positive
and negative current.
MCP401X-203E
MCP401X-503E
MCP401X-104E
MCP401X-504E
AB
Part Number
value that has been selected.
or
Figure
S
) is the resistance from one tap
2-48).
© 2006 Microchip Technology Inc.
Total (R
Typical Resistance (Ω)
10000
50000
2100
5000
Figure
AB
Table 6-1
)
2-11,
Step (R
Figure
158.73
793.65
33.33
79.37
shows the
2-24,
S
)