MCP4014T-202E/OT Microchip Technology, MCP4014T-202E/OT Datasheet - Page 26

• 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

MCP4011/2/3/4
4.0
The MCP4011/2/3/4 devices are general purpose
digital potentiometers intended to be used in
applications where a programmable resistance with
moderate bandwidth is desired.
Applications generally suited for the MCP4011/2/3/4
devices include:
• Set point or offset trimming
• Sensor calibration
• Selectable gain and offset amplifier designs
• Cost-sensitive mechanical trim pot replacement
The digital potentiometer is available in four nominal
resistances (R
defined as the resistance between terminal A and ter-
minal B. The four nominal resistances are 2.1 k , 5 k ,
10 k and 50 k
There are 63 resistors in a string between terminal A
and terminal B. The wiper can be set to tap onto any of
these 63 resistors thus providing 64 possible settings
(including terminal A and terminal B).
Figure 4-1 shows a block diagram for the resistive
network of the device. Equation 4-1 shows the calcula-
tion for the step resistance, while Equation 4-2 illus-
trates the calculation used to determine the resistance
between the wiper and terminal B.
FIGURE 4-1:
DS21978A-page 26
R
R
R
R
Note 1: The wiper resistance is tap dependent.
S
S
S
S
GENERAL OVERVIEW
B
A
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 k ) more.
AB
), where the nominal resistance is
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
W
EQUATION 4-1:
EQUATION 4-2:
1 LSb is the ideal resistance difference between two
successive codes. If we use N = 1 and R
Equation 4-2, we can calculate the step size for each
increment or decrement command.
The MCP4011 device offers a voltage divider
(potentiometer) with all terminals available on pins.
The MCP4012 is a true rheostat, with terminal A and
the wiper (W) of the variable resistor available on pins.
The MCP4013 device offers a voltage divider (potenti-
ometer) with terminal B connected to ground.
The MCP4014 device is a Rheostat device with termi-
nal A of the resistor floating, terminal B connected to
ground, and the wiper (W) available on pin.
The MCP4011 can be externally configured to imple-
ment any of the MCP4012, MCP4013 or MCP4014
configurations.
4.1
A 2-wire synchronous serial protocol is used to incre-
ment or decrement the digital potentiometer’s wiper
terminal. The Increment/Decrement (U/D) protocol
utilizes the CS and U/D input pins. Both inputs are
tolerant of signals up to 12.5V without damaging the
device. The CS pin can differenciate between two high-
voltage levels, V
commands without requiring additional input pins. The
high-voltage commands (V
similar to the standard commands and are supported
for compatability to the MCP401X family of devices.
The simple U/D protocol uses the state of the U/D pin
at the falling edge of the CS pin to determine if
Increment or Decrement mode is desired. Subsequent
rising edges of the U/D pin move the wiper.
The wiper value will not underflow or overflow.
Serial Interface
N = 0 to 63 (decimal)
IH
R
R
WB
and V
S
=
R
R
=
© 2005 Microchip Technology Inc.
S
WB
R
---------
63
R
------------- -
IHH
AB
CALCULATION
AB
63
IHH
CALCULATION
. This enables additional
N
+
on the CS pin) are
R
W
W
= 0 in