CATALYST CAT5112U

Advance Information
CAT5112
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
APPLICATIONS
■ 32 Position Linear Taper Potentiometer
■ Automated Product Calibration
■ Non-volatile NVRAM Wiper Storage
■ Remote Control Adjustments
■ Low Power CMOS Technology
■ Offset, Gain and Zero Control Systems
■ Single Supply Operation: 2.5V-6.0V
■ Tamper-Proof Calibrations
■ Increment Up/Down Serial Interface
■ Contrast, Brightness and Volume Controls
■ Resistance Values: 10K, 20K, 50K and 100K Ω
■ Motor Controls and Feedback Systems
■ Available in PDIP, SOIC, TSSOP and MSOP packages
■ Programmable Analog Functions
DESCRIPTION
when power is returned. The wiper can be adjusted to
test new system values without effecting the stored
setting. Wiper-control of the CAT5112 is
accomplished with three input control pins, CS, U/D,
and INC. The INC input increments the wiper in the
direction which is determined by the logic state of
the U/D input. The CS input is used to select the
device and also store the wiper position prior to
power down.
The CAT5112 is a single digitally programmable
potentiometer (DPP™) designed as a electronic
replacement for mechanical potentiometers and trim
pots. Ideal for automated adjustments on high volume
production lines, they are also well suited for
applications where equipment requiring periodic
adjustment is either difficult to access or located in a
hazardous or remote environment.
The CAT5112 contains a 32-tap series resistor array
connected between two terminals RH and RL. An up/
down counter and decoder that are controlled by three
input pins, determines which tap is connected to the
wiper, RW. The CAT5112 wiper is buffered by an OP
AMP that operates rail to rail. The wiper setting, stored
in non-volatile NVRAM memory, is not lost when the
device is powered down and is automatically recalled
The digitally programmable potentiometer can be
used as a three-terminal resistive divider or as a
two-terminal variable resistor. DPPs bring variability and
programmability to a wide variety of applications
including control, parameter adjustments, and
signal processing.
FUNCTIONAL DIAGRAM
VCC
VH /R H
RH
U/D
INC
Control
and
Memory
+
–
VW / R W
R WB
CS
RL
VL / R L
Implementation of the
Electronic Potentiometer
VSS
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25091-00 Rev. 3/28/01
M-1
CAT5112
Advance Information
PIN CONFIGURATION
PIN FUNCTIONS
DIP/SOIC Package
INC
U/D
RH
GND
VCC
CS
RL
RW
Pin Name
TSSOP Package
CS
RL
VCC
RW
GND
RH
INC
U/D
MSOP Package
INC
U/D
RH
GND
VCC
CS
RL
RW
Function
INC
Increment Control
U/D
Up/Down Control
RH
Potentiometer High Terminal
GND
Ground
RW
Potentiometer Wiper Terminal
RL
Potentiometer Low Terminal
CS
Chip Select
VCC
Supply Voltage
PIN DESCRIPTIONS
INC
INC: Increment Control Input
of the CAT5112 and is active low. When in a high
state, activity on the INC and U/D inputs will not
affect or change the position of the wiper.
The INC input moves the wiper in the up or down direction
determined by the condition of the U/D input.
U/D
D: Up/Down Control Input
DEVICE OPERATION
The U/D input controls the direction of the wiper
movement. When in a high state and CS is low, any highto-low transition on INC will cause the wiper to move one
increment toward the RH terminal. When in a low state
and CS is low, any high-to-low transition on INC will
cause the wiper to move one increment towards the
RL terminal.
The CAT5112 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RW equivalent to the mechanical
potentiometer's wiper. There are 32 available tap positions including the resistor end points, RH and RL. There
are 31 resistor elements connected in series between
the RH and R L terminals. The wiper terminal is
connected to one of the 32 taps and controlled by three
inputs, INC, U/D and CS. These inputs control a five-bit
up/down counter whose output is decoded to select the
wiper position. The selected wiper position can be
stored in nonvolatile memory using the INC and
CS inputs.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
greater than the RL terminal. Voltage applied to the RH
terminal cannot exceed the supply voltage, VCC or go
below ground, GND.
With CS set LOW the CAT5112 is selected and will
respond to the U/D and INC inputs. HIGH to LOW
transitions on INC wil increment or decrement the
wiper (depending on the state of the U/D input and fivebit counter). The wiper, when at either fixed terminal,
acts like its mechanical equivalent and does not move
beyond the last position. The value of the counter is
stored in nonvolatile memory whenever CS transitions
HIGH while the INC input is also HIGH. When the
CAT5112 is powered-down, the last stored wiper counter
position is maintained in the nonvolatile memory. When
power is restored, the contents of the memory are
recalled and the counter is set to the value stored.
RW: Wiper Potentiometer Terminal
RW is the wiper terminal of the potentiometer. Its position
on the resistor array is controlled by the control inputs, INC,
U/D and CS. Voltage applied to the RW terminal cannot
exceed the supply voltage, VCC or go below ground, GND.
RL: Low End Potentiometer Terminal
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
less than the RH terminal. Voltage applied to the RL
terminal cannot exceed the supply voltage, VCC or go
below ground, GND. RL and RH are electrically
interchangeable.
With INC set low, the CAT5112 may be de-selected
and powered down without storing the current wiper
position in nonvolatile memory. This allows the
system to always power up to a preset value stored
in nonvolatile memory.
CS
CS: Chip Select
The chip select input is used to activate the control input
Doc. No. 25091-00 Rev. 3/01
M-1
2
CAT5112
Advance Information
OPERATION MODES
RH
INC
CS
U/D
Operation
High to Low
Low
High
W toward H
High to Low
Low
Low
W toward L
High
Low to High
X
Store Wiper Position
Low
Low to High
X
No Store, Return to Standby
X
High
X
Standby
Supply Voltage
VCC to GND ...................................... –0.5V to +7V
Inputs
CS to GND .............................–0.5V to VCC +0.5V
INC to GND ............................–0.5V to VCC +0.5V
U/D to GND ............................–0.5V to VCC +0.5V
H to GND ................................–0.5V to VCC +0.5V
L to GND ................................–0.5V to VCC +0.5V
W to GND ............................... –0.5V to VCC +0.5V
Parameter
ESD Susceptibility
Latch-Up
Data Retention
Endurance
TDR
NEND
Min
RW
CW
CL
Max
2000
100
100
1,000,000
Units
Test Method
Volts
mA
Years
Stores
MIL-STD-883, Test Method 3015
JEDEC Standard 17
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 1003
DC Electrical Characteristics: VCC = +2.5V to +6.0V unless otherwise specified
Power Supply
Symbol Parameter
Conditions
Min
VCC
ICC1
Operating Voltage Range
Supply Current (Increment) CAT5114
ICC2
Supply Current (Write)
ISB1 (2)
Supply Current (Standby)
CAT5114
Potentiometer
Equivalent Circuit
RL
* Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Absolute Maximum Ratings
are limited values applied individually while other parameters are
within specified operating conditions, and functional operation at any
of these conditions is NOT implied. Device performance and reliability
may be impaired by exposure to absolute rating conditions for extended
periods of time.
RELIABILITY CHARACTERISTICS
VZAP(1)
ILTH(1)(2)
Rwi
Operating Ambient Temperature
Commercial (‘C’ suffix) .................... 0°C to +70°C
Industrial (‘I’ suffix) ...................... – 40°C to +85°C
Junction Temperature ..................................... +150°C
Storage Temperature ....................... –65°C to +150°C
Lead Soldering (10 sec max) .......................... +300°C
ABSOLUTE MAXIMUM RATINGS
Symbol
CH
Typ
Max
Units
V
µA
VCC = 6V, f = 1MHz, IW=0
VCC = 6V, f = 250KHz, IW=0
Programming, VCC = 6V
VCC = 3V
2.5
—
—
—
—
—
—
—
—
—
6.0
100
50
1
500
mA
µA
CS=VCC-0.3V
—
—
1
µA
U/D, INC=VCC-0.3V or GND
Logic Inputs
Symbol
Parameter
Conditions
IIH
IIL
VIH1
VIL1
Input Leakage Current
Input Leakage Current
TTL High Level Input Voltage
TTL Low Level Input Voltage
VIH2
CMOS High Level Input Voltage
VIL2
CMOS Low Level Input Voltage
NOTES:
(1)
(2)
(3)
(4)
Min
Typ
Max
Units
VIN = VCC
VIN = 0V
4.5V ≤ VCC ≤ 5.5V
—
—
2
0
—
—
—
—
10
–10
VCC
0.8
µA
µA
V
V
2.5V ≤ VCC ≤ 6V
VCC x 0.7
—
VCC + 0.3
V
-0.3
—
VCC x 0.2
V
This parameter is tested initially and after a design or process change that affects the parameter.
Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to VCC + 1V
IW=source or sink
These parameters are periodically sampled and are not 100% tested.
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Doc. No. 25091-00 Rev. 3/01
M-1
CAT5112
Advance Information
Potentiometer Parameters
Symbol
RPOT
Parameter
Conditions
Min
Potentiometer Resistance
Typ
Max
Units
10KΩ
20KΩ
50KΩ
100KΩ
Pot Resistance Tolerance
±15
%
VRH
Voltage on RH pin
OV
VCC
V
VRL
Voltage on RL pin
OV
VCC
V
Resolution
3.2
%
INL
Integral Linearity Error
IW ≤ 2µA
0.5
1
LSB
DNL
Differential Linearity Error
IW ≤ 2µA
0.25
.5
LSB
RWi
Wiper Resistance
VCC = 5V, IW = 1mA
400
Ω
VCC = 2.5V, IW = 1mA
1K
Ω
1
mA
IW
Wiper Current
TCRPOT
TC of Pot Resistance
ppm/oC
TCRATIO
Ratiometric TC
ppm/oC
RISO
Isolation Resistance
VN
Noise
CH/CL/CW
Ω
nV/√Hz
Potentiometer Capacitances
Doc. No. 25091-00 Rev. 3/01
M-1
10/10/25
4
pF
CAT5112
Advance Information
AC CONDITIONS OF TEST
VCC Range
2.5V ≤ VCC ≤ 6V
Input Pulse Levels
0.2VCC to 0.7VCC
Input Rise and Fall Times
10ns
Input Reference Levels
0.5VCC
AC OPERATING CHARACTERISTICS:
VCC = +2.5V to +6.0V, VH = VCC, VL = 0V, unless otherwise specified
Symbol
tCI
tDI
tID
tIL
tIH
tIC
tCPH
tCPH
tIW
tCYC
tR, tF(2)
tPU(2)
tR VCC(2)
tWR
Limits
Parameter
CS to INC Setup
U/D to INC Setup
U/D to INC Hold
INC LOW Period
INC HIGH Period
INC Inactive to CS Inactive
CS Deselect Time (NO STORE)
CS Deselect Time (STORE)
INC to VOUT Change
INC Cycle Time
INC Input Rise and Fall Time
Power-up to Wiper Stable
VCC Power-up Rate
Store Cycle
Min
Typ(1)
Max
Units
100
50
100
250
250
1
100
10
—
1
—
—
0.2
—
—
—
—
—
—
—
—
—
1
—
—
—
—
5
—
—
—
—
—
—
—
—
5
—
500
1 msec
50
10
ns
ns
ns
ns
ns
µs
ns
ms
µs
µs
µs
msec
V/ms
ms
A. C. TIMING
CS
(store)
tCYC
tCI
tIL
tIC
tIH
tCPH
90%
INC
90%
10%
tDI
tID
tF
U/D
tR
MI (3)
tIW
W
(1) Typical values are for TA=25oC and nominal supply voltage.
(2) This parameter is periodically sampled and not 100% tested.
(3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
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Doc. No. 25091-00 Rev. 3/01
M-1
CAT5112
Advance Information
ORDERING INFORMATION
Prefix
CAT
Optional
Company ID
Device #
5112
Product Number
5112: Buffered
5114: Unbuffered
Suffix
S
I
Package
P: PDIP
S: SOIC
U: TSSOP
R: MSOP
-10
Resistance
-10: 10K Ohms
-20: 20K Ohms
-50: 50K Ohms
-00: 100K Ohms
TE13
Tape & Reel
TE13: 2000/Reel
Temperature Range
Blank = Commercial (0°C to +70°C)
I = Industrial (-40°C to +85°C)
Notes:
(1) The device used in the above example is a CAT5112 SI-10TE13 (SOIC, 10K Ohms, Industrial Temperature, Tape & Reel)
Doc. No. 25091-00 Rev. 3/01
M-1
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