MCP4017 datasheet(42/66 Pages) MICROCHIP

42 / 66 page

MCP4017/18/19

DS22147A-page 42

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

Equation 6-2 illustrates the calculation used to

determine the resistance between the wiper and

terminal B.

EQUATION 6-2:

RWB CALCULATION

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 k

Ω,

10 k

Ω, 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

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

Part Number

Resistance (

Ω)

Case

Total

(RAB)

Step (RS)

MCP4017/18/19-502E

Min.

4000

31.496

Typical 5000

39.370

Max.

6000

47.244

MCP4017/18/19-103E

Min.

8000

62.992

Typical 10000

78.740

Max.

12000

94.488

MCP4017/18/19-503E

Min.

40000

314.961

Typical 50000

393.701

Max.

60000

472.441

MCP4017/18/19-104E

Min.

80000

629.921

Typical 100000

787.402

Max.

120000

944.882

RAB

127

---------

RWB

RABN

127

-------------- RW

N = 0 to 127 (decimal)

Resistance

Code

Typical

RAB Value

Default POR Wiper

Setting

Code (1)

-502

5.0 k

Mid-scale

3Fh

-103

10.0 k

Mid-scale

3Fh

-503

50.0 k

Mid-scale

3Fh

-104

100.0 k

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.

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