MCP4562 View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
MCP4562 Datasheet PDF : 66 Pages
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MCP4017/18/19
Step resistance (RS) is the resistance from one tap
setting to the next. This value will be dependent on the
RAB value that has been selected. Equation 6-1 shows
the calculation for the step resistance while Table 6-2
shows the typical step resistances for each device.
EQUATION 6-1: RS CALCULATION
RS
=
-R---A----B-
127
Equation 6-2 illustrates the calculation used to
determine the resistance between the wiper and
terminal B.
EQUATION 6-2: RWB CALCULATION
RWB
=
R----A----B---N--
127
+
RW
N = 0 to 127 (decimal)
The digital potentiometer is available in four nominal
resistances (RAB) where the nominal resistance is
defined as the resistance between terminal A and
terminal B. The four nominal resistances are 5 kΩ,
10 kΩ, 50 kΩ, and 100 kΩ.
The total resistance of the device has minimal variation
due to operating voltage (see Figure 2-11, Figure 2-29,
Figure 2-47, or Figure 2-65).
TABLE 6-2: STEP RESISTANCES
Resistance (Ω)
Part Number
MCP4017/18/19-502E
MCP4017/18/19-103E
MCP4017/18/19-503E
MCP4017/18/19-104E
Case
Total
(RAB)
Min. 4000
Typical 5000
Max. 6000
Min. 8000
Typical 10000
Max. 12000
Min. 40000
Typical 50000
Max. 60000
Min. 80000
Typical 100000
Max. 120000
Step (RS)
31.496
39.370
47.244
62.992
78.740
94.488
314.961
393.701
472.441
629.921
787.402
944.882
A POR/BOR event will load the Volatile Wiper register
value with the default value. Table 6-3 shows the
default values offered.
TABLE 6-3: DEFAULT FACTORY
SETTINGS SELECTION
Resistance Typical
Code RAB Value
Default POR Wiper
Setting
Code (1)
-502
5.0 kΩ
Mid-scale
3Fh
-103
10.0 kΩ Mid-scale
3Fh
-503
50.0 kΩ Mid-scale
3Fh
-104
100.0 kΩ Mid-scale
3Fh
Note 1: Custom POR/BOR Wiper Setting options
are available, contact the local Microchip
Sales Office for additional information.
Custom options have minimum volume
requirements.
DS22147A-page 42
© 2009 Microchip Technology Inc.
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