CATALYST CAT5126ZI-50-GT3

CAT5126
One-Time Digitally Programmable 32-Tap Potentiometer
FEATURES
DESCRIPTION
„ Wiper position stored after one-time nonvolatile programming
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 onetime 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.
„ User-defined Power-On wiper position
„ 32-tap positions
„ Wiper position programmed through simple 2wire serial interface
„ Low 0.35µA (typ) static supply current
„ 2.5V to 5.5V single-supply operation
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.
„ 10kΩ, 50kΩ, and 100kΩ end-to-end resistances
„ 50ppm/°C end-to-end temperature coefficient
and 5ppm/°C ratiometric temperature
coefficient
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.
„ TDFN 8-pad (2 x 3mm) and MSOP 8-lead packages
APPLICATIONS
„ Mechanical potentiometer replacement
For Ordering Information details, see page 10.
„ Products using one-time factory calibration
„ Contrast, brightness, volume controls
„ Programmable analog functions
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
MSOP (Z)
(top view)
1
RH
8
VDD 3
8
RH
¯¯¯
CS
2 CAT 7
RL
VDD
3 5126 6
¯
U/D
CS
4
VPP
U/D
RW
GND
5
GND
2
1
2
3
4
8
7
6
5
R30
UP/DOWN
COUNTER
6
RW
32-POSITION
DECODER
TDFN (VP2)
(top view)
RW
¯¯¯
CS
VDD
GND
R31
4
RH
RL
¯
U/D
VPP
VPP
5
ONE-TIME
PROGRAM
BLOCK
R2
R1
7
RL
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2129 Rev. B
1
RW
CAT5126
PIN DESCRIPTION
Pin
Name
Function
1
RW
Wiper Connection
2
¯¯¯
CS
¯¯¯ transition determines the mode: increment if U/D
¯ is high, or
Chip-Select Input. A high-to-low CS
¯ is low. CS
¯¯¯ is also used for one-time programming (see the One-Time
decrement if U/D
Programming section).
3
VDD
Power-Supply Voltage
4
GND
5
VPP
Programming Voltage for One-Time Programming. Connect VPP to 10V supply when one-time
programming the device. For normal operation, connect to ground or let float.
6
¯
U/D
¯¯¯ low, a low-to-high transition increments or decrements the
Up/Down Control Input. With CS
wiper position.
7
RL
Low Terminal of Resistor
8
RH
High Terminal of Resistor
Ground
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
VDD to GND
VPP to GND
All other pins to GND
Maximum Continuous Current into H, L, and W
Continuous Power Dissipation (TA = +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 VDD +0.5
±1.5
Units
V
V
V
mA
362
1951
mW
mW
-40 to +85
+150
-65 to +150
+300
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
VDD = 2.5V to 5.5V, VPP = GND, RH = VDD, RL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values
(1)
are at VDD = 5.0V, TA = +25°C, unless otherwise noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
DC PERFORMANCE
RES
RPOT
TCRPOT
TCRATIO
Resolution
End-to-End Resistance
3.2
%
-10 Device
8
10
12
-50 Device
40
50
60
-00 Device
80
100
120
±50
±300
ppm/°C
±5
±20
ppm/°C
TC of Pot Resistance
Ratiometric Resistance
TC
kΩ
INL
Integral Nonlinearity
Potentiometer configuration,
no load
0.5
1
LSB
DNL
Differential Nonlinearity
Potentiometer configuration,
no load
0.25
0.5
LSB
VDD = 5V
70
100
Ω
VDD = 2.5V
150
200
Ω
RW
Wiper Resistance
¯¯¯, U/D
¯)
DIGITAL INPUTS (CS
VIH
Input High Voltage
VIL
Input Low Voltage
IIN
Input Leakage Current
CIN
Input Capacitance
0.7 x VDD
V
±0.1
0.3 x VDD
V
±1
µA
5
pF
POWER SUPPLY
VDD
Supply Voltage
IDD
Stand by Current
IDDW
Programming Current
VPP
Programming Voltage
IPP
VPP Input Current
2.5
5.5
V
0.35
1
µA
0.25
1
mA
VDD = 5V
8.5
10
VDD = 2.5V
6.0
10
(Note 2)
VPP = 10V
5
V
µA
Notes:
(1) All devices are production tested at TA = +25°C and are guaranteed by design for TA = -40°C to +85°C.
¯¯¯ and U/D
¯ are connected to GND or VDD.
(2) Digital inputs CS
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-2129 Rev. B
CAT5126
ELECTRICAL CHARACTERISTICS (continued)
VDD = 2.5V to 5.5V, VPP = GND, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VDD = 5.0V, TA = +25°C, unless otherwise noted. (1)
TIMING CHARACTERISTICS (2)
Symbol
Parameter
Conditions
Min
tCU
¯ Mode to CS
¯¯¯ Setup
U/D
Figures 1, 2
50
ns
tCI
¯¯¯ Hold to U/D
¯ Mode
CS
Figures 1, 2
50
ns
tIC
¯ Step Hold to CS
¯¯¯
U/D
Figures 1, 2
0
ns
tIL
¯ Step Low Time
U/D
Figures 1, 2
100
ns
tIH
¯ Step High Time
U/D
Figures 1, 2
100
ns
tIW
Wiper Switching Time
CL = 0pF, Figures 1, 2
tPC
tCP
¯¯¯
VPP Rising Edge to CS
Falling Edge
¯¯¯ Falling Edge to VPP
CS
Falling Edge
Typ
Max
100
Units
ns
Figure 3
1
ms
Figure 3
5
ms
tCL
¯¯¯ Step Low Time
CS
Figure 3
5
ms
tCH
¯¯¯ Step High Time
CS
Figure 3
5
ms
tPH
¯¯¯
VPP Falling Edge to CS
Rising Edge
Figure 3
1
ms
fU/D¯MAX
¯ Frequency
U/D
tUP
Power-Up Time
tSETTLE
Output Settling Time
(Note 3)
100kΩ variable resistor
configuration, CL = 10pF
1
100kΩ potentiometer
configuration, CL = 10pF
0.25
5
MHz
1
ms
µs
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
CAT5126
TYPICAL OPERATING CHARACTERISTICS
VDD = 2.5V to 5.5V, VPP = GND, VH = VDD, VL = GND, TA = +25°C.
VPP vs. VDD
IDD programming vs. VDD
10
300
Valid
Programming
250
8
7
ICC (uA)
VPP (V)
9
Invalid
Programming
200
150
6
5
100
2.5
3.5
4.5
5.5
2.5
3.5
VDD (V)
5.5
VDD (V)
Wiper Resistance vs. Tap Position @ 25°C
Wiper Voltage vs. Tap Position
120
6.0
VDD = 2.5V
100
5.0
80
VDD = 5.0V
4.0
V W (V)
R W (Ω )
4.5
60
40
3.0
2.0
VDD = 5V
20
VDD = 2.5V
1.0
0
0.0
0
10
20
30
0
Tap Position
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
10
20
30
Tap
5
Doc. No. MD-2129 Rev. B
CAT5126
decrements the wiper position depending on the
current mode.
DETAILED DESCRIPTION
The value of the counter is then stored and the wiper
position is maintained till the device is Powered down.
The CAT5126 devices are 10kΩ/50kΩ/100kΩ (end-toend resistance) digitally controlled potentiometers.
They have 32-tap positions that are accessible to the
wiper along the resistor array between RH and RL.
The wiper performs a make-before-break transition,
ensuring that there is never an open circuit during a
transition from one resistor tap to another. When the
wiper is at either end (max/min) of the resistor array,
additional transitions in the direction of the endpoint
do not change the counter value (the counter does not
wrap around).
The wiper (RW) position is adjusted sequentially
through the tap positions using a simple I2C interface.
These digital potentiometers have an optional one-time
programmable feature that sets the POR position of the
wiper. The I2C interface can then be disabled,
permanently preventing unwanted adjustment.
One-Time Programming
The factory-set default position of the wiper on powerup is tap 16. However, the power-up position can be
changed once using the one-time programming feature.
After the wiper is moved to the desired position, the
¯ high,
programming sequence is initiated by setting U/D
CS low. Five
applying 10V to VPP, and then taking ¯¯¯
pulses on ¯¯¯
CS (consisting of ¯¯¯
CS starting from low and
going high for tCH and then low for tCL) program the
device (Figure 3). The programming voltage should
then be taken to zero. After the device is programmed,
VPP can be set to zero or be allowed to float. The wiper
position is still adjustable, but always returns to this
programmed position on power-up.
DIGITAL INTERFACE OPERATION
The CAT5126 devices have two modes of operation
when the serial interface is active: increment mode
and decrement mode. The serial interface is only
¯¯¯ is low.
active when CS
¯¯¯ and U/D
¯ inputs control the position of the
The CS
¯¯¯ transitions
wiper along the resistor array. When CS
from high to low, the part goes into increment mode if
¯ is high (Figure 1), and into decrement mode if
U/D
¯ is low (Figure 2). Once the mode is set, the
U/D
¯¯¯ goes high. A
device remains in that mode until CS
¯ increments or
low-to-high transition at the U/D
VDD
tUP
CS
tCU
tCI
tIL
tIH
tIC
U/D
tIW
VW
Figure 1. Increment Mode Serial Interface Timing Diagram
VDD
CS
U/D
tUP
tCU
tCI
tIH
tIL
tIC
tIW
VW
Figure 2. Decrement Mode Serial Interface Timing Diagram
Doc. No. MD-2129 Rev. B
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5126
If the intent is to program the device to a specific
wiper position and not to allow further adjustments,
then six programming pulses are required (as
opposed to five), as shown in Figure 3. The sixth
pulse locks the wiper position and disables the serial
¯ and CS
¯¯¯ to float without
interface. This also allows U/D
any increase in supply current. Once the lockout bit is
set, no further adjustment to the potentiometer is
possible, effectively changing the potentiometer into a
fixed resistor-divider (Table 1).
pulses (program the initial power-up value of the
device, but still be able to adjust the wiper). If the
device is programmed with five pulses and later it is
desired to disable the interface (convert to a fixed
voltage-divider), then care must be taken to ensure
that the wiper is in the same position as it was
originally set to (when programmed with five pulses).
The full six programming pulses must be applied.
Note that once the six-pulse program occurs, no
further programming is possible.
¯¯¯
It is recommended that the user either use six CS
pulses (convert to a fixed voltage-divider) or five
Table 1. One-Time Programming Mode
Mode
Power Up Position
Interface
Operation
Factory Default
At midscale
Active
Programming allowed
Programming with 5 pulses at the
midscale position
At midscale
Active
Programming allowed
Programming with 5 pulses different
from midscale position – only once
At the new
programmed position
Active
No further change in powerup position allowed
Programming with 5 pulses if the
power up position was changed before
At the previous
programmed position
Active
None
Programming with 6 pulses if the tap
position is at midscale
Midscale position
forever
I2C interface
active till power
down
I2C interface disable after
next power-up
Programming ONLY with 6 pulses if
the tap position is different from
midscale position
At the new
programmed position
I2C interface
active till power
down
I2C interface disable after
next power-up
U/D
10V
VPP
0V
tCH
tCL
tCP
CS
tPH
tPC
5 BITS PROGRAM WIPER POSITION
OPTIONAL LOCKOUT BIT
Figure 3. One Time Program Mode Serial Interface Timing Diagram
Notes:
(1) If CAT5126 is Programmed with less than 5 pulses, it does not change the Power-up recall position.
(2) During internal power-up the wiper is forced to miscale; thereafter the wiper is set at the stored position.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-2129 Rev. B
CAT5126
PACKAGE OUTLINE DRAWINGS
MSOP 8-Lead 3 x 3mm (Z)
(1)(2)
SYMBOL
MIN
NOM
MAX
A
E
E1
1.10
A1
0.05
0.10
0.15
A2
0.75
0.85
0.95
b
0.22
c
0.13
D
2.90
0.38
0.23
3.00
3.10
E
4.80
4.90
5.00
E1
2.90
3.00
3.10
e
L
0.65 BSC
0.40
0.60
L1
L2
θ
0.80
0.95 REF
0.25 BSC
0º
6º
TOP VIEW
D
A
A2
A1
DETAIL A
e
b
c
SIDE VIEW
END VIEW
θ
L2
L
L1
DETAIL A
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC Specification MO-187.
Doc. No. MD-2129 Rev. B
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5126
TDFN 8-Pad 2mm x 3mm (VP2)
(1)(2)
D
A
e
b
E2
E
PIN#1
IDENTIFICATION
A1
PIN#1 INDEX AREA
D2
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A2
0.45
0.55
0.65
A3
0.20
0.25
0.30
D
1.90
2.00
2.10
D2
1.30
1.40
1.50
E
2.90
3.00
3.10
E2
1.20
1.30
1.40
e
L
BOTTOM VIEW
A2
A3
0.20 REF
b
L
FRONT VIEW
050 TYP
0.20
0.30
0.40
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC Specification MO-229.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. MD-2129 Rev. B
CAT5126
EXAMPLE OF ORDERING INFORMATION
Prefix
Device #
CAT
(1)
Suffix
5126
Z
I
-10
–
G
Temperature Range
I = Industrial (-40ºC to 85ºC)
Company ID
Product Number
5126
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
Resistance
-10: 10kΩ
-50: 50kΩ
-00: 100kΩ
Package
Z: MSOP
VP2: TDFN
T3
Lead Finish
G:NiPdAu
ORDERING INFORMATION
Ordering Part Number
Resistor [kΩ]
Package-Pin
Part Per Reel
CAT5126VP2I-10-GT3
10
TDFN
3000
CAT5126VP2I-50-GT3
(4)
50
TDFN
3000
CAT5126VP2I-00-GT3
(4)
100
TDFN
3000
CAT5126ZI-10-GT3
10
MSOP
3000
CAT5126ZI-50-GT3
(4)
50
MSOP
3000
CAT5126ZI-00-GT3
(4)
100
MSOP
3000
For Product Top Mark Codes, click here:
http://www.catsemi.com/techsupport/producttopmark.asp
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) The device used in the above example is a CAT5126ZI-10-GT3 (MSOP, Industrial Temperature range, 10kΩ, NiPdAu, Tape & Reel,
3,000/Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. MD-2129 Rev. B
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
03/14/07
A
03/12/08
B
Reason
Initial Issue
Add Top Mark Code link
Add -MD to document number
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Document No: MD-2129
Revision:
B
Issue date:
03/12/08