MCP4014T-202E/OT Microchip Technology, MCP4014T-202E/OT Datasheet - Page 39

• Manufacturer Part Number: MCP4014T-202E/OT
• Description: IC DGTL POT 2.1K 1CH RHE SOT23-5
• Manufacturer: Microchip Technology

Specifications of MCP4014T-202E/OT

• Taps: 64
• Resistance (ohms): 2.1K
• Number Of Circuits: 1
• Temperature Coefficient: 150 ppm/°C Typical
• Memory Type: Volatile
• Interface: Up/Down
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Resistance In Ohms: 2.10K
• End To End Resistance: 2.1kohm
• No. Of Steps: 64
• Resistance Tolerance: ± 20%
• Supply Voltage Range: 2.7V To 5.5V
• Control Interface: 2 Wire, Serial
• No. Of Pots: Single
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP4014T-202E/OTTR

6.2
Wiper resistance is the series resistance of the wiper.
This resistance is typically measured when the wiper is
positioned at either zero-scale (00h) or full-scale (3Fh).
The wiper resistance in potentiometer-generated
voltage divider applications is not a significant source
of error.
The wiper resistance in rheostat applications can
create significant non-linearity as the wiper is moved
toward zero-scale (00h). The lower the nominal
resistance, the greater the possible error.
Wiper resistance is significant depending on the
devices operating voltage. As the device voltage
decreases, the wiper resistance increases (see
Figure 6-4 and Table 6-2).
In a rheostat configuration, this change in voltage
needs to be taken into account, particularly for the
lower resistance devices. For the 2.1 k
maximum wiper resistance at 5.5V is approximately 6%
of the total resistance, while at 2.7V, it is approximately
15.5% of the total resistance.
In a potentiometer configuration, the wiper resistance
variation does not effect the output voltage seen on the
terminal W pin.
TABLE 6-2:
© 2005 Microchip Technology Inc.
10000
50000
(R
Total
2100
5000
Note 1: The wiper resistance (R
AB
Typical
)
2: R
3: R
Wiper Resistance
158.73
793.65
33.33
79.37
Step
(R
applications. In rheostat applications, the variation of the R
S
AB
S
Resistance ( )
)
is the typical value. The variation of this resistance is minimal over voltage.
is the typical value. The variation of this resistance is minimal over voltage.
TYPICAL STEP RESISTANCES AND RELATIONSHIP TO WIPER RESISTANCE
Typical
75
75
75
75
Wiper (R
Max @
5.5V
125
125
125
125
W
W
) is not a significant source of error in potentiometer-generated voltage divider
)
Max @
2.7V
325
325
325
325
device, the
225.0%
47.25%
Typical
94.5%
9.45%
R
W
=
R
W
R
/ R
@ 5.5V
375.0%
157.5%
78.75%
15.75%
W
The slope of the resistance has a linear area (at the
higher voltages) and a non-linear area (at the lower
voltages), where resistance increases faster than the
voltage drop (at low voltages).
FIGURE 6-4:
Resistance (R
Since there is minimal variation of the total device
resistance over voltage, at a constant temperature (see
Figure 2-11, Figure 2-24, Figure 2-36 or Figure 2-48),
the change in wiper resistance over voltage can have a
significant impact on the INL and DNL error.
S
= Max
(%)
Note:
R
(1, 2)
W
W
R
204.75%
975.0%
409.5%
40.95%
@ 2.7V
W
value can create significant non-linearity.
= Max
The slope of the resistance has a linear
area (at the higher voltages) and a non-
linear area (at the lower voltages).
W
MCP4011/2/3/4
) to Voltage.
Typical
3.57%
0.75%
0.15%
Relationship of Wiper
R
1.5%
W
=
R
W
V
/ R
R
DD
@ 5.5V
W
5.95%
2.50%
1.25%
0.25%
AB
= Max
DS21978A-page 39
(%)
(1, 3)
R
15.48%
@ 2.7V
W
6.50%
3.25%
0.65%
= Max