CAT5140
Single Channel 256 Tap
Digital Potentiometer (POT)
with Integrated EEPROM
and I
2
C Control
The CAT5140 is a single channel non-volatile 256-tap digital POT.
This digital POT is comprised of a series of equal value resistor
elements connected between two externally accessible end points. The
tap points between each resistive element can be selectively connected
to the wiper output via internal CMOS switches forming a linear taper
electronic potentiometer.
The CAT5140 contains a volatile wiper register (WR) and an 8-bit
non-volatile EEPROM for wiper position and 5 additional
non-volatile registers for general purpose data storage. Programming
of the registers is controlled via I
2
C interface. On power up, the wiper
position is reset to the most recent value stored in the non-volatile
memory register (IVR).
The CAT5140 is available in an Pb free, RoHS compliant 8-lead
MSOP package, and operates over the industrial temperature range of
−40C
to +85C.
Features
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MSOP−8 3x3
Z SUFFIX
CASE 846AD
MARKING DIAGRAM
400 kHz I
2
C Compatible Interface
256 Position Linear Taper Potentiometer
End-to-End Resistance = 50 kW / 100 kW
TCR = 100 ppm/C (typical)
Standby Current = 2
mA
(max)
Typical Wiper Resistance = 70
W
@ 3.3 V
Operating Voltage = 2.5 V to 5.5 V
6 Registers 8-bit Non-volatile EEPROM
2,000,000 Data Write Stores
100 Year Data Retention
8-lead MSOP Package
NiPdAu Plating
These Devices are Pb-Free and are RoHS Compliant
Volatile
WP
SCL
SDA
GND
I
2
C and
CONTROL
ACR
WIPER
IVR
GP
GP
GP
Non−Volatile
R
L
R
W
ABUT
YMX
1
1
ABTJ
YMX
ABUT = 100 kW Resistance
ABTJ = 50 kW Resistance
Y = Production Year
Y =
(Last Digit)
M = Production Month
M =
(1
−
9, A, B, C)
X = Production Revision
PIN CONNECTIONS
WP
SCL
SDA
GND
1
VCC
R
H
R
L
R
W
(Top View)
VCC
R
H
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Figure 1. Functional Block Diagram
Semiconductor Components Industries, LLC, 2013
July, 2013
−
Rev. 4
1
Publication Order Number:
CAT5140/D
CAT5140
Table 1. ORDERING INFORMATION
Part Number
CAT5140ZI−50−GT3
CAT5140ZI−00−GT3
Resistance
50 kW
100 kW
Temperature Range
−40C
to 85C
Package
MSOP−8 3x3
(Pb-Free)
Shipping
†
3000/Tape & Reel
3000/Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
1. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com.
Table 2. PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Pin Name
WP
SCL
SDA
GND
R
W
R
L
R
H
V
CC
Memory Write Protect: Active Low
Serial Clock
Serial Data
Ground
Wiper Terminal
Potentiometer Low Terminal
Potentiometer High Terminal
Supply Voltage
Description
WP: Write Protect Input
The WP pin when tied low prevents any write operations
within the device.
SCL: Serial Clock
open drain output and can be wire-Ored with the other open
drain or open collector I/Os.
R
H
, R
L
: Resistor End Points
The CAT5140 serial clock input pin is used to clock all
data transfers into or out of the device.
SDA: Serial Data
The set of R
H
and R
L
pins is equivalent to the terminal
connections on a mechanical potentiometer.
The CAT5140 bidirectional serial data pin is used to
transfer data into and out of the device. The SDA pin is an
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameter
V
IN
Supply Voltage V
CC
to Ground (Note 2)
Terminal voltages: R
H
, R
L
, R
W
, SDA, SCL, WP
Wiper Current
Storage Temperature Range
Junction Temperature Range
Lead Soldering Temperature (10 seconds)
ESD Rating HBM (Human Body Model)
ESD Rating MM (Machine Model)
The R
W
pin is equivalent to the wiper terminal of a
mechanical potentiometer and its position is controlled by
the WR register.
R
W
: Wiper
Rating
−0.5
to +7
−0.5
to V
CC
+ 0.5
6.0
−65
to +150
−40
to +150
300
2000
200
Unit
V
V
mA
C
C
C
V
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
2. The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum DC
voltage on output pins is V
CC
+0.5 V, which may overshoot to V
CC
+2.0 V for periods of less than 20 ns.
Table 4. RECOMMENDED OPERATING CONDITIONS
Parameter
V
CC
Wiper Current
Temperature Range
Rating
2.5 to 5.5
3
−40
to +85
Unit
V
mA
_C
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2
CAT5140
Table 5. POTENTIOMETER CHARACTERISTICS
(Note 3) (V
CC
= +2.5 V to +5.5 V,
−40_C
to +85_C unless otherwise specified.)
Limits
Parameter
Potentiometer Resistance ‘−50’
Potentiometer Resistance ‘−00’
Potentiometer Resistance Tolerance
Power Rating
Wiper Current
Wiper Resistance
Integral Non-Linearity
Differential Non-Linearity
Integral Non-Linearity
Differential Non-Linearity
Voltage on R
H
or R
L
Resolution
Zero Scale Error
Full Scale Error
Temperature Coefficient of R
POT
Ratiometric Temp. Coefficient
Potentiometer Capacitances
Frequency Response
3.
4.
5.
6.
(Notes 6, 7)
(Notes 6, 7)
(Notes 6, 7)
R
POT
= 50 kW (Note 8)
TC
RPOT
TC
RATIO
C
H
/C
L
/C
W
fc
10/10/25
0.4
0
−2
V
SS
= 0 V
Resistor Mode
I
W
=
3
mA
V
CC
= 3.3 V
Voltage Divider Mode
25C
I
W
R
W
INL
DNL
RINL
RDNL
V
TERM
V
SS
0.4
0.5
−0.5
100
20
2
0
70
Test Conditions
Symbol
R
POT
R
POT
Min
Typ
50
100
20
50
3
200
1
0.5
1
0.5
V
CC
Max
Units
kW
kW
%
mW
mA
W
LSB (Note 4)
LSB (Note 4)
LSB (Note 4)
LSB (Note 4)
V
%
LSB (Note 5)
LSB (Note 5)
ppm/C
ppm/C
pF
MHz
Latch-up protection is provided for stresses up to 100 mA on address and data pins from
−1
V to V
CC
+1 V.
LSB = R
TOT
/ 255 or (R
H
−
R
L
) / 255, single pot.
V(R
W
)
255
−V(R
W
)
0
]/255 (R
W
)
255
= 0xFF, (R
W
)
0
= 0x00.
Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
7. Relative linearity is a measure of the error in step size. It is determined by the actual change in voltage between two successive tap positions
when used as a potentiometer.
8. This parameter is tested initially and after a design or process change that affects the parameter.
Table 6. D.C. OPERATING CHARACTERISTICS
(V
CC
= +2.5 V to +5.5 V,
−40C
to +85C unless otherwise specified.)
Parameter
Power Supply Current
Volatile Write & Read
Power Supply Current
Non-volatile Write
Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
SDA Output Buffer Low Voltage
Power-On Recall
V
CC
= 2.5 V, I
OL
= 4 mA
Minimum V
CC
for memory recall
Test Conditions
f
SCL
= 400 kHz
V
CC
= 5.5 V, Inputs = GND
f
SCL
= 400 kHz
V
CC
= 5.5 V, Inputs = GND
V
CC
= 5.0 V
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
Symbol
I
CC1
I
CC2
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL1
V
POR
1.4
−1
V
CC
x 0.7
−10
Min
Max
1
3
2
+10
10
V
CC
x 0.3
V
CC
+ 1.0
0.4
2.0
Units
mA
mA
mA
mA
mA
V
V
V
V
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CAT5140
Table 7. CAPACITANCE
(T
A
= 25C, f = 1.0 MHz, V
CC
= 5 V)
Test
Input/Output Capacitance (SDA)
Input Capacitance (SCL, WP)
Test Conditions
V
I/O
= 0 V
V
IN
= 0 V
Symbol
C
I/O
(Note 9)
C
IN
(Note 9)
Max
8
6
Units
pF
pF
Table 8. POWER UP TIMING
(Notes 9 and 10)
Parameter
Power-up to Read Operation
Power-up to Write Operation
Symbol
t
PUR
t
PUW
Max
1
1
Units
ms
ms
9. This parameter is tested initially and after a design or process change that affects the parameter.
10. t
PUR
and t
PUW
are delays required from the time V
CC
is stable until the specified operation can be initiated.
Table 9. DIGITAL POT TIMING
Parameter
Wiper Response Time After Power Supply Stable
Wiper Response Time: SCL falling edge after last bit of wiper position data
byte to wiper change
Symbol
t
WRPO
t
WR
Min
Max
50
20
Units
ms
ms
Table 10. ENDURANCE
Parameter
Endurance
Data Retention
Reference Test Method
MIL−STD−883, Test Method 1033
MIL−STD−883, Test Method 1008
Symbol
N
END
T
DR
Min
2,000,000
100
Max
Units
Cycles
Years
Table 11. A.C. CHARACTERISTICS
(V
CC
= +2.5 V to +5.5 V,
−40_C
to +85_C unless otherwise specified.)
Parameter
Clock Frequency
Clock High Period
Clock Low Period
Start Condition Setup Time (for a Repeated Start Condition)
Start Condition Hold Time
Data in Setup Time
Data in Hold Time
Stop Condition Setup Time
Time the bus must be free before a new transmission can start
WP Setup Time
WP Hold Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Data Out Hold Time
Noise Suppression Time Constant at SCL, SDA Inputs
SLC Low to SDA Data Out and ACK Out
Non-Volatile Write Cycle Time
Symbol
f
SCL
t
HIGH
t
LOW
t
SU:STA
t
HD:STA
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
t
SU:WP
t
HD:WP
t
R
t
F
t
DH
T
I
t
AA
t
WR
4
100
50
1
10
600
1300
600
600
100
0
600
1300
0
2.5
300
300
Min
Typ
Max
400
Units
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ms
ms
ns
ns
ns
ns
ms
ms
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4
CAT5140
SCL
SDA
Start
Condition
Stop
Condition
Figure 2. Start and STOP Timing
t
HIGH
t
LOW
SCL
t
SU:STA
SDA IN
t
AA
SDA OUT
t
DH
t
HD:STA
t
HD:DAT
t
SU:DAT
t
SU:STO
t
BUF
t
F
t
R
Figure 3. Bus Timing
Bus Release Delay (Transmitter)
SCL from
Master
1
8
9
Bus Release
Delay (Receiver)
Data Output
from Transmitter
Data Output
from Receiver
Start
ACK Delay ( t
AA
)
ACK Setup ( t
SU:DAT
)
Figure 4. Acknowledge Timing
Start
SCL
CLK1
Stop
t
HD:STO,
t
HD:STO:NV
SDA IN
t
SU:WP
WP
t
HD:WP
Figure 5. WP Timing
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