MCP40D18 datasheet(42/66 Pages) MICROCHIP

42 / 66 page

MCP40D17/18/19

DS22152B-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

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)

MCP40D17/18/19-

502

Minimum

4000

31.496

Typical

5000

39.370

Maximum

6000

47.244

MCP40D17/18/19-

103

Minimum

8000

62.992

Typical

10000

78.740

Maximum

12000

94.488

MCP40D17/18/19-

503

Minimum

40000

314.961

Typical

50000

393.701

Maximum

60000

472.441

MCP40D17/18/19-

104

Minimum

80000

629.921

Typical

100000

787.402

Maximum

120000

944.882

127

---------

ABN

127

--------------R

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.

MCP40D18 Datasheet(PDF) 42 Page - Microchip Technology

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