MCP4021/2/3/4
Low-Cost NV Digital POT with WiperLock Technology
Package Types
Features
MCP4021 MCP4022
Non-volatile Digital Potentiometer in SOT-23,
SOIC, MSOP and DFN packages
SOIC, MSOP, DFN SOT-23-6
Potentiometer Rheostat
64 Taps: 63 Resistors with Taps to terminal A and
terminal B
V V A
1 8 U/D
DD DD 1 6
A
W
Simple Up/Down (U/D) Protocol
V V W
2 7 NC 2 5
SS SS
Power-on Recall of Saved Wiper Setting
A
B
A 3 6 U/D CS
B 3 4
B
Resistance Values: 2.1 k, 5 k, 10 k or 50 k
W
W
4 5 CS
Low Tempco:
- Absolute (Rheostat): 50 ppm (0C to 70C typ.)
MCP4023 MCP4024
- Ratiometric (Potentiometer): 10 ppm (typ.)
SOT-23-6 SOT-23-5
Potentiometer Rheostat
Low Wiper Resistance: 75 (typ.)
WiperLock Technology to Secure the wiper V A V W
1 A 6 1 5
DD DD
W
setting in non-volatile memory (EEPROM)
V W
V
SS 2 5 SS 2
B W B
A
High-Voltage Tolerant Digital Inputs: Up to 12.5V
U/D CS
U/D CS
3 4 3 4
Low-Power Operation: 1 A Max Static Current
Wide Operating Voltage: 2.7V to 5.5V
Extended Temperature Range: -40C to +125C
Block Diagram
Wide Bandwidth (-3 dB) Operation:
A
- 4 MHz (typ.) for 2.1 k device
V
DD
Power-Up
and
Description
Brown-Out
V
SS Control
The MCP4021/2/3/4 devices are non-volatile, 6-bit
digital potentiometers that can be configured as either a
potentiometer or rheostat. The wiper setting is
2-Wire
controlled through a simple Up/Down (U/D) serial
Interface W
CS
interface.
and
U/D
Control
These devices implement Microchips WiperLock tech-
Logic
nology, which allows application-specific calibration
settings to be secured in the EEPROM without
requiring the use of an additional write-protect pin. EEPROM and
WiperLock
Technology
B
Device Features
Resistance (typical) V
DD
Wiper Memory # of Control WiperLock
Device Operating
Configuration Type Steps Interface Technology
Options (k)Wiper ()
Range
(1)
MCP4021 Potentiometer EE 2.1, 5.0, 10.0, 50.0 75 64 2.7V - 5.5V U/D Yes
MCP4022 Rheostat EE 2.1, 5.0, 10.0, 50.0 75 64 2.7V- 5.5V U/D Yes
MCP4023 Potentiometer EE 2.1, 5.0, 10.0, 50.0 75 64 2.7V - 5.5V U/D Yes
MCP4024 Rheostat EE 2.1, 5.0, 10.0, 50.0 75 64 2.7V - 5.5V U/D Yes
Note 1: Floating either terminal (A or B) allows the device to be used in Rheostat mode.
.
2006 Microchip Technology Inc. DS21945E-page 1
Wiper Register
(Resistor Array)MCP4021/2/3/4
Notice: Stresses above those listed under Maximum
1.0 ELECTRICAL
Ratings may cause permanent damage to the device. This is
CHARACTERISTICS
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Absolute Maximum Ratings
Exposure to maximum rating conditions for extended periods
V ............................................................................................................. 6.5V
may affect device reliability.
DD
CS and U/D inputs w.r.t V -0.3V to 12.5V
SS....................................
A, B and W terminals w.r.t V -0.3V to V + 0.3V
SS.................... DD
Current at Input Pins ..................................................10 mA
Current at Supply Pins ...............................................10 mA
Current at Potentiometer Pins ...................................2.5 mA
Storage temperature .....................................-65C to +150C
Ambient temp. with power applied ................-55C to +125C
ESD protection on all pins ........... 4kV (HBM), 400V (MM)
Maximum Junction Temperature (T )..........................+150C
J
AC/DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply across the specified operating ranges.
T = -40C to +125C, 2.1 k, 5k, 10 k and 50 k devices. Typical specifications represent values for V = 5.5V, V = 0V,
A DD SS
T = +25C.
A
Parameters Sym Min Typ Max Units Conditions
Operating Voltage Range V 2.7 5.5 V
DD
CS Input Voltage V V 12.5 V The CS pin will be at one of three
CS SS
input levels (V , V or V ).
IL IH IHH
(Note 6)
Supply Current I 45 A 5.5V, CS = V , f = 1 MHz
DD SS U/D
15 A 2.7V, CS = V , f = 1 MHz
SS U/D
0.3 1 A Serial Interface Inactive
(CS = V , U/D = V )
IH IH
0.6 3 mA EE Write cycle, T = +25C
A
Resistance R 1.68 2.1 2.52 k -202 devices (Note 1)
AB
( 20%)
4.0 5 6.0 k -502 devices (Note 1)
8.0 10 12.0 k -103 devices (Note 1)
40.0 50 60.0 k -503 devices (Note 1)
Resolution N 64 Taps No Missing Codes
R / 63
Step Resistance R Note 6
AB
S
Note 1: Resistance is defined as the resistance between terminal A to terminal B.
2: INL and DNL are measured at V with V = V and V = V . (-202 devices V = 4V).
W A DD B SS A
3: MCP4021/23 only, test conditions are: I = 1.9 mA, code = 00h.
W
4: MCP4022/24 only, test conditions are:
Current at Voltage Comments
Device
Resistance
5.5V 2.7V
2.1 k 2.25 mA 1.1 mA MCP4022 includes V
WZSE
MCP4024 includes V
WFSE
5k 1.4 mA 450 A
10 k 450 A 210 A
50 k 90 A 40 A
5: Resistor terminals A, W and Bs polarity with respect to each other is not restricted.
6: This specification by design
7: Non-linearity is affected by wiper resistance (R ), which changes significantly over voltage and temperature. See
W
Section 6.0 Resistor for additional information.
8: The MCP4021 is externally connected to match the configurations of the MCP4022 and MCP4024, and then tested.
DS21945E-page 2 2006 Microchip Technology Inc.