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CAT5126
One-Time Digitally Programmable 32-Tap Potentiometer
FEATURES
Wiper position stored after one-time non-
volatile programming
User-defined Power-On wiper position
32-tap positions
Wiper position programmed through simple 2-
wire serial interface
Low 0.35µA (typ) static supply current
2.5V to 5.5V single-supply operation
10kΩ, 50kΩ, and 100kΩ end-to-end resistances
50ppm/°C end-to-end temperature coefficient
and 5ppm/°C ratiometric temperature
coefficient
TDFN 8-pad (2 x 3mm) and MSOP 8-lead packages
DESCRIPTION
The
CAT5126
is
a
digital
programmable
potentiometer. The wiper position is controlled with a
simple 2-wire digital interface. This digital
potentiometer is unique in that it has an optional one-
time programmable feature that either sets the wiper’s
position upon power-on to a user-defined value, or the
wiper can be set and the interface also disabled to
prevent further adjustment.
The CAT5126 has an end-to-end resistance of 10kΩ,
50kΩ, and 100kΩ. All CAT5126 devices have
32-wiper positions and operate from a single 2.5V to
5.5V supply.
The CAT5126 is available in TDFN 8-pad and MSOP
8-lead packages. Each device is guaranteed over the
industrial temperature range of -40°C to +85°C.
For Ordering Information details, see page 10.
APPLICATIONS
Mechanical potentiometer replacement
Products using one-time factory calibration
Contrast, brightness, volume controls
Programmable analog functions
PIN CONFIGURATION
MSOP (Z)
(top view)
R
W
¯¯¯
CS
V
DD
GND
1
8
R
H
R
L
¯
U/D
V
PP
FUNCTIONAL DIAGRAM
R
H
8
V
DD
3
GND
4
2
UP/DOWN
COUNTER
6
32-POSITION
DECODER
ONE-TIME
PROGRAM
BLOCK
R
W
1
R
W
R
30
R
31
2
CAT
7
3
5126
6
4
5
CS
U/D
TDFN (VP2)
(top view)
R
W
¯¯¯
CS
V
DD
GND
1
2
3
4
8
7
6
5
R
H
R
L
¯
U/D
V
PP
V
PP
5
R
2
R
1
7
R
L
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2129 Rev. B
CAT5126
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Name
R
W
¯¯¯
CS
V
DD
GND
V
PP
¯
U/D
R
L
R
H
Function
Wiper Connection
¯¯¯
¯
Chip-Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or
¯
¯¯¯
decrement if U/D is low. CS is also used for one-time programming (see the One-Time
Programming section).
Power-Supply Voltage
Ground
Programming Voltage for One-Time Programming. Connect V
PP
to 10V supply when one-time
programming the device. For normal operation, connect to ground or let float.
¯¯¯
Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the
wiper position.
Low Terminal of Resistor
High Terminal of Resistor
(1)
ABSOLUTE MAXIMUM RATINGS
Parameters
V
DD
to GND
V
PP
to GND
All other pins to GND
Maximum Continuous Current into H, L, and W
Continuous Power Dissipation (T
A
= +70°C)
MSOP 8-Lead (derate 4.5mW/°C above +70°C)
TDFN 8-Pad (derate 24.4mW/°C above +70°C)
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s)
Ratings
-0.5 to +7.0
-0.5 to +12.0
-0.5 to V
DD
+0.5
±1.5
362
1951
-40 to +85
+150
-65 to +150
+300
Units
V
V
V
mA
mW
mW
ºC
ºC
ºC
ºC
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Doc. No. MD-2129 Rev. B
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5126
ELECTRICAL CHARACTERISTICS
V
DD
= 2.5V to 5.5V, V
PP
= GND, R
H
= V
DD
, R
L
= GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
(1)
are at V
DD
= 5.0V, T
A
= +25°C, unless otherwise noted.
Symbol
RES
R
POT
TC
RPOT
TC
RATIO
INL
DNL
R
W
Parameter
Resolution
-10 Device
End-to-End Resistance
TC of Pot Resistance
Ratiometric Resistance
TC
Integral Nonlinearity
Differential Nonlinearity
Wiper Resistance
Potentiometer configuration,
no load
Potentiometer configuration,
no load
V
DD
= 5V
V
DD
= 2.5V
0.7 x V
DD
0.3 x V
DD
±0.1
5
2.5
(Note 2)
V
DD
= 5V
V
DD
= 2.5V
V
PP
= 10V
0.35
0.25
8.5
6.0
5.5
1
1
10
10
5
±1
-50 Device
-00 Device
8
40
80
Conditions
Min
Typ
3.2
10
50
100
±50
±5
0.5
0.25
70
150
12
60
120
±300
±20
1
0.5
100
200
ppm/°C
ppm/°C
LSB
LSB
Ω
Ω
V
V
µA
pF
V
µA
mA
V
µA
kΩ
Max
Units
%
DC PERFORMANCE
¯¯¯
¯
DIGITAL INPUTS (CS, U/D)
V
IH
V
IL
I
IN
C
IN
V
DD
I
DD
I
DDW
V
PP
I
PP
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
Supply Voltage
Stand by Current
Programming Current
Programming Voltage
V
PP
Input Current
POWER SUPPLY
Notes:
(1) All devices are production tested at T
A
= +25°C and are guaranteed by design for TA = -40°C to +85°C.
¯¯¯
¯
(2) Digital inputs CS and U/D are connected to GND or V
DD
.
3
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. MD-2129 Rev. B
CAT5126
ELECTRICAL CHARACTERISTICS (continued)
V
DD
= 2.5V to 5.5V, V
PP
= GND, V
H
= V
DD
, V
L
= GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at V
DD
= 5.0V, T
A
= +25°C, unless otherwise noted.
(1)
TIMING CHARACTERISTICS
(2)
Symbol
t
CU
t
CI
t
IC
t
IL
t
IH
t
IW
t
PC
t
CP
t
CL
t
CH
t
PH
f
U/DMAX
¯
t
UP
t
SETTLE
Parameter
¯
¯¯¯
U/D Mode to CS Setup
¯¯¯
¯
CS Hold to U/D Mode
¯
¯¯¯
U/D Step Hold to CS
¯
U/D Step Low Time
¯
U/D Step High Time
Wiper Switching Time
¯¯¯
V
PP
Rising Edge to CS
Falling Edge
¯¯¯
CS Falling Edge to V
PP
Falling Edge
¯¯¯
CS Step Low Time
¯¯¯
CS Step High Time
¯¯¯
V
PP
Falling Edge to CS
Rising Edge
¯
U/D Frequency
Power-Up Time
Output Settling Time
(Note 3)
100kΩ variable resistor
configuration, C
L
= 10pF
100kΩ potentiometer
configuration, C
L
= 10pF
1
µs
0.25
Conditions
Figures 1, 2
Figures 1, 2
Figures 1, 2
Figures 1, 2
Figures 1, 2
C
L
= 0pF, Figures 1, 2
Figure 3
Figure 3
Figure 3
Figure 3
Figure 3
1
5
5
5
1
5
1
Min
50
50
0
100
100
100
Typ
Max
Units
ns
ns
ns
ns
ns
ns
ms
ms
ms
ms
ms
MHz
ms
Notes:
(1) All devices are production tested at TA = +25°C and are guaranteed by design for TA = -40°C to +85°C.
(2) Digital timing is guaranteed by design, not production tested.
(3) Power-up time is the period of time from when the power supply is applied until the serial interface is ready for writing.
Doc. No. MD-2129 Rev. B
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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