CAT5132
16 Volt Digitally Programmable Potentiometer (DPP™)
with 128 Taps and 2-wire Interface
FEATURES
I
Single linear DPP with 128 taps
I
End-to-end resistance of 10kΩ, 50kΩ or 100kΩ
Ω
Ω
Ω
I
2-wire (I
2
C-like) interface
I
Fast Up/Down wiper control mode
I
Non-volatile wiper setting storage
I
Automatic wiper setting recall at power-up
I
Digital Supply range (V
CC
): 2.7V to 5.5V
I
Analog Supply range (V+): +8V to +16V
I
Low Standby Current: 15
µ
A
I
100 Year wiper setting memory
I
Industrial Temperature range: -40
o
C to +85
o
C
I
RoHS-compliant 10-pin MSOP package
DESCRIPTION
The CAT5132 is a high voltage Digitally Programmable
Potentiometer (DPP) with non-volatile wiper setting
memory, operating like a mechanical potentiometer.
The tap points between the 127 equal resistive elements
are connected to the wiper output via CMOS switches.
The switches are controlled by a 7-bit Wiper Control
Register (WCR). The wiper setting can be stored in a
7-bit non-volatile Data Register (DR). The WCR is
accessed via the 2-wire serial bus.
Upon power-up, the WCR is set to mid-scale (1000000).
After the power supply is stable, the contents of the DR
are transferred to the WCR and the wiper is returned to
the memorized setting.
The CAT5132 has two voltage supplies: V
CC
, the digital
supply and V+, the analog supply. V+ can be much
higher than V
CC
, allowing for 16V analog operations.
The CAT5132 can be used as a potentiometer or as a
two-terminal variable resistor.
APPLICATIONS
I
LCD screen adjustment
I
Volume control
I
Mechanical potentiometer replacement
I
Gain adjustment
I
Line impedance matching
I
VCOM setting adjustments
For Ordering Information details, see page 13.
BLOCK DIAGRAM
SDA
SCL
A0
A1
VCC
V+
127
CONTROL LOGIC AND
ADDRESS DECODE
RH
127 RESISTIVE
128 TAP POSITION
DECODE CONTROL
7-BIT
NONVOLATILE
MEMORY
REGISTER
(DR)
7-BIT WIPER
CONTROL
REGISTER
(WCR)
0
ELEMENTS
RL
RW
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25092, Rev. 04
CAT5132
PIN CONFIGURATION
PIN DESCRIPTION
Pin
Number
SDA
GND
VCC
A1
A0
1
2
3
4
5
10
9
8
7
6
SCL
V+
RL
RW
RH
Name
SDA
Description
Serial Data Input/Output - Bidirectional Serial Data pin
used to transfer data into and out of the CAT5132. This
is an Open-Drain I/O and can be wire OR'd with other
Open-Drain (or Open Collector) I/Os.
Ground
Digital Supply Voltage (2.7V to 5.5V)
Address Select Input to select slave address for
2-wire bus.
Address Select Input to select slave address for
2-wire bus.
High Reference Terminal for the potentiometer
Wiper Terminal for the potentiometer
Low Reference Terminal for the potentiometer
Analog Supply Voltage for the potentiometer (+8.0V to
16.0V)
Serial Bus Clock input for the 2-wire Serial Bus. This
clock is used to clock all data transfers into and out of
the CAT5132
1
2
3
4
5
6
7
8
9
10
GND
V
CC
A1
A0
R
H
R
W
R
L
V+
SCL
MSOP 10-Pin Package
Doc. No. 25092, Rev. 04
2
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5132
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias....................-55˚C to +125˚C
Storage Temperature ........................ -65˚C to +150˚C
Voltage on any SDA, SCL, A0 & A1 pins with respect
to Ground
(1)
................................. -0.3V to V
CC
+ 0.3V
Voltage on R
H
, R
L
& R
W
pins with respect
to Ground ................................................................ V+
V
CC
with respect to Ground .................... -0.3V to +6V
V+ with respect to Ground ................. -0.3V to +16.5V
Wiper Current (10 sec) ...................................... +6mA
Lead Soldering temperature (10 sec) .............. +300˚C
RECOMMENDED OPERATING CONDITIONS
V
CC
= +2.7V to +5.5V
V+ = +8.0V to +16V
Operating Temperature Range: -40˚C to +85˚C
COMMENT
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.
Notes:
1. Latch-up protection is provided for stresses up to 100mA on
address and data pins from -0.3V to V
CC
+0.3V.
POTENTIOMETER CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Symbol
R
POT
R
POT
R
POT
R
TOL
I
W
R
W
V
TERM
RES
A
LIN
R
LIN
TC
RPOT
TC
Ratio
C
H
/C
L
/C
W
fc
Parameter
Potentiometer Resistance (100k
Ω)
Potentiometer Resistance (50k
Ω)
Potentiometer Resistance (10k
Ω)
Potentiometer Resistance Tolerance
Power Rating
Wiper Current
Wiper Resistance
Voltage on R
W
, R
H
or R
L
Resolution
Absolute Linearity
Relative Linearity
(2)
Test Conditions
Limits
Min
Typ
100
50
10
+20
Max
Units
kΩ
kΩ
kΩ
%
mW
mA
Ω
Ω
V
%
LSB
LSB
(4)
(4)
25° C
I
W
= +1mA @ V+ = 12V
I
W
= +1mA @ V+ = 8V
GND = 0V; V+ = 8V to 16V
V
W(n)(actual)
- V
W(n)(expected) (5), (6)
V
W(n+1)
- [V
W(n)
+LSB]
(5), (6)
(1)
(1)
(1)
50
+3
70
110
GND
0.78
+1
+0.5
+300
30
10/10/25
0.4
150
200
V+
(3)
Temperature Coefficient of R
POT
Ratiometric Temperature Coefficient
Potentiometer Capacitances
Frequency Response
ppm/° C
ppm/° C
pF
MHz
R
POT
= 50k
Ω
Notes:
1. This parameter is tested initially and after a design or process change that affects the parameter.
2. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
3. Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer.
4. LSB = (R
HM -
R
LM
)/127; where R
HM
and R
LM
are the highest and lowest measured values on the wiper terminal.
5. n = 1, 2, ..., 127
6. V
+
@ R
H
; 0V @ R
L
; V
W
measured @ R
W
with no load.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc No. 25092, Rev. 04
CAT5132
D.C. ELECTRICAL CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Symbol
I
CC1
I
CC2
I
SB(VCC)
I
SB(V+)
I
LI
I
LO
V
IL
V
IH
V
OL1
Parameter
Power Supply Current
(Volatile Write/Read)
Power Supply Current
(Nonvolatile WRITE)
Standby Current (V
CC
= 5V)
V+ Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= 3.0)
Test Conditions
F
SCL
= 400kHz, SDA Open,
V
CC
= 5.5V, Input = GND
F
SCL
= 400kHz, SDA Open,
V
CC
= 5.5V, Input = GND
V
IN
= GND or V
CC
, SDA = V
CC
V
CC
= 5V, V+ = 16V
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
Min
Max
1
3.0
5
10
10
10
Units
mA
mA
µA
µA
µA
µA
V
V
V
-1
V
CC
x 0.7
I
OL
= 3mA
V
CC
x 0.3
V
CC
+ 1.0
0.4
CAPACITANCE
T
A
= 25˚C, f = 1.0MHz, V
CC
= 5.0V
Symbol
C
I/O
C
IN
Parameter
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, SCL)
Test Conditions
V
I/O
= 0V
(1)
V
IN
= 0V
(1)
Min
Max
8
6
Units
pF
pF
A.C. CHARACTERISTICS
V
CC
= 2.7 - 5.5V
Symbol
F
SCL
T
I (1)
t
AA
t
BUF
(1)
Parameter
(see Fig. 1)
Clock Frequency
Noise Suppression Time Constant at SCL & SDA Inputs
SLC Low to SDA Data Out and ACK Out
Time the bus must be free before a new transmission can start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time (for a Repeated Start Condition)
Data in Hold Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Conditions Setup Time
Data Out Hold Time
Min
Max
400
50
1
Units
kHz
ns
µs
µs
µs
µs
µs
µs
ns
1.2
0.6
1.2
0.6
0.6
0
0.3
300
0.6
100
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
R
t
F
(1)
(1)
µs
ns
µs
ns
t
SU:STO
t
DH
Notes:
1. This parameter is tested initially and after a design or process change that affects the parameter.
Doc. No. 25092, Rev. 04
4
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5132
POWER UP TIMING
(1)(2)
Symbol
t
PUR
t
PUW
Parameter
Power-up to Read Operation
Power-up to Write Operation
Min
Max
1
1
Units
ms
ms
XDCP TIMING
Symbol
t
WRPO
t
WRL
Parameter
Wiper Response Time After Power Supply Stable
Wiper Response Time After Instruction Issued
Min
5
5
Max
10
10
Units
µs
µs
WRITE CYCLE LIMITS
Symbol
t
WR
Parameter
Write Cycle Time (see Fig. 2)
Min
Max
5
Units
ms
The write cycle is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle.
During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high and the device does not
respond to its slave address.
RELIABILITY CHARACTERISTICS
Symbol
N
END (1)
T
DR (1)
Parameter
Endurance
Data Retention
Reference Test Method
MIL-STD-883, Test Method 1033
MIL-STD-883, Test Method 1008
Min
100,000
100
Max
Units
Cycles
Years
Notes:
1. This parameter is tested initially and after a design or process change that affects the parameter.
2. t
PUR
and t
PUW
are the delays required from the time VCC is stable until the specified operation can be initiated.
TYPICAL PERFORMANCE CHARACTERISTICS
Resistance between R
W
and R
L
12.000
10.000
8.000
6.000
4.000
2.000
0.000
0
16
32
48
64
Tap position
80
96
112
128
Icc2 (uA)
Icc2 (NV write) vs Temperature
400
350
300
250
200
150
100
50
0
-50
-30
-10
10
30
50
70
90
110 130
Temperature (°C)
Vcc = 2.7V
Vcc = 5.5V
Vcc=2.7V; V+=8v
Vcc=5.5V; V+=16V
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
R
WL
(Kohm)
5
Doc No. 25092, Rev. 04
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