CAT5126 [CATALYST]
One-Time Digitally Programmable 32-Tap Potentiometer; 一时间数字可编程32抽头电位器
| 型号： | CAT5126 |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | One-Time Digitally Programmable 32-Tap Potentiometer |
| 文件： | 总11页 (文件大小：231K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT5126
One-Time Digitally Programmable 32-Tap Potentiometer
FEATURES
DESCRIPTION
Wiper position stored after one-time non-
The
CAT5126
is
a
digital
programmable
volatile programming
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.
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
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
Products using one-time factory calibration
Contrast, brightness, volume controls
Programmable analog functions
For Ordering Information details, see page 10.
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
R
H
8
MSOP (Z)
(top view)
3
V
DD
RW
1
2
3
4
8
7
6
5
RH
RL
GND
R
R
31
4
2
¯¯¯
CS
CAT
5126
CS
¯
U/D
VDD
UP/DOWN
COUNTER
30
GND
VPP
U/D
6
R
W
1
32-POSITION
DECODER
R
W
TDFN (VP2)
(top view)
ONE-TIME
PROGRAM
BLOCK
R
R
2
5
RW
¯¯¯
CS
VDD
1
2
3
4
8
7
6
5
RH
RL
V
PP
¯
U/D
VPP
1
GND
7
R
L
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2129 Rev. B
CAT5126
PIN DESCRIPTION
Pin Name Function
1
RW
Wiper Connection
Chip-Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or
¯¯¯
¯
¯
¯¯¯
¯¯¯
CS
2
decrement if U/D is low. CS is also used for one-time programming (see the One-Time
Programming section).
3
4
VDD
Power-Supply Voltage
GND Ground
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.
5
6
VPP
¯¯¯
Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the
¯
U/D
wiper position.
7
8
RL
RH
Low Terminal of Resistor
High Terminal of Resistor
ABSOLUTE MAXIMUM RATINGS (1)
Parameters
Ratings
-0.5 to +7.0
-0.5 to +12.0
-0.5 to VDD +0.5
±1.5
Units
V
VDD to GND
VPP to GND
V
All other pins to GND
Maximum Continuous Current into H, L, and W
V
mA
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)
362
1951
mW
mW
Operating Temperature Range
Junction Temperature
-40 to +85
+150
ºC
ºC
ºC
ºC
Storage Temperature Range
Lead Temperature (soldering, 10s)
-65 to +150
+300
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
are at VDD = 5.0V, TA = +25°C, unless otherwise noted.(1)
Symbol Parameter
DC PERFORMANCE
Conditions
Min
Typ
Max
Units
%
RES
Resolution
3.2
10
-10 Device
-50 Device
-00 Device
8
12
60
RPOT
End-to-End Resistance
kΩ
40
80
50
100
±50
120
±300
TCRPOT TC of Pot Resistance
ppm/°C
ppm/°C
Ratiometric Resistance
TCRATIO
TC
±5
±20
1
Potentiometer configuration,
no load
INL
Integral Nonlinearity
0.5
LSB
LSB
Potentiometer configuration,
no load
DNL
Differential Nonlinearity
0.25
0.5
VDD = 5V
70
100
200
Ω
Ω
RW
Wiper Resistance
VDD = 2.5V
150
¯¯¯
¯
DIGITAL INPUTS (CS, U/D)
VIH
VIL
IIN
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
0.7 x VDD
V
V
0.3 x VDD
±1
±0.1
5
µA
pF
CIN
POWER SUPPLY
VDD
IDD
Supply Voltage
2.5
5.5
1
V
Stand by Current
(Note 2)
VDD = 5V
0.35
0.25
8.5
µA
mA
IDDW
Programming Current
1
10
10
5
VPP
IPP
Programming Voltage
VPP Input Current
V
VDD = 2.5V
6.0
VPP = 10V
µA
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 inputs CS and U/D are connected to GND or VDD
.
© 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
50
Typ
Max
Units
ns
¯
¯¯¯
tCU
tCI
tIC
tIL
Figures 1, 2
U/D Mode to CS Setup
¯¯¯
¯
Figures 1, 2
50
ns
CS Hold to U/D Mode
¯
¯¯¯
Figures 1, 2
0
ns
U/D Step Hold to CS
¯
Figures 1, 2
100
100
ns
U/D Step Low Time
¯
tIH
tIW
Figures 1, 2
ns
U/D Step High Time
Wiper Switching Time
CL = 0pF, Figures 1, 2
100
ns
¯¯¯
PP Rising Edge to CS
Falling Edge
V
tPC
tCP
Figure 3
Figure 3
1
5
ms
ms
¯¯¯
CS Falling Edge to VPP
Falling Edge
¯¯¯
tCL
tCH
Figure 3
Figure 3
5
5
ms
ms
CS Step Low Time
¯¯¯
CS Step High Time
¯¯¯
PP Falling Edge to CS
Rising Edge
V
tPH
Figure 3
1
ms
¯
5
1
MHz
ms
fU/DMAX
U/D Frequency
¯
tUP
Power-Up Time
(Note 3)
100kΩ variable resistor
configuration, CL = 10pF
1
tSETTLE
Output Settling Time
µs
100kΩ potentiometer
configuration, CL = 10pF
0.25
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
250
200
150
100
9
Valid
Programming
8
7
Invalid
Programming
6
5
2.5
3.5
4.5
5.5
2.5
3.5
4.5
5.5
VDD (V)
VDD (V)
Wiper Resistance vs. Tap Position @ 25°C
Wiper Voltage vs. Tap Position
120
6.0
VDD = 2.5V
100
5.0
4.0
3.0
2.0
1.0
0.0
80
60
VDD = 5.0V
40
VDD = 5V
20
0
VDD = 2.5V
0
10
20
30
0
10
20
30
Tap Position
Tap
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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-to-
end 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 power-
up 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
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
¯
programming sequence is initiated by setting U/D high,
¯¯¯
applying 10V to VPP, and then taking CS low. Five
¯¯¯
active when CS is low.
¯¯¯
¯¯¯
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.
¯¯¯
¯
The CS and U/D inputs control the position of the
¯¯¯
wiper along the resistor array. When CS transitions
from high to low, the part goes into increment mode if
¯
U/D is high (Figure 1), and into decrement mode if
¯
U/D is low (Figure 2). Once the mode is set, the
¯¯¯
device remains in that mode until CS goes high. A
¯
low-to-high transition at the U/D increments or
V
DD
t
UP
CS
t
t
t
t
t
t
IC
CU
CI
IL
IH
U/D
IW
V
W
Figure 1. Increment Mode Serial Interface Timing Diagram
V
DD
t
UP
CS
t
t
t
t
t
IC
CU
CI
IH
IL
U/D
t
IW
V
W
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
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.
¯
¯¯¯
interface. This also allows U/D and CS to float without
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).
¯¯¯
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
Active
Active
Programming allowed
Programming with 5 pulses different
from midscale position – only once
At the new
programmed position
No further change in power-
up position allowed
Programming with 5 pulses if the
power up position was changed before programmed position
At the previous
None
I2C interface
active till power
down
Programming with 6 pulses if the tap
position is at midscale
Midscale position
forever
I2C interface disable after
next power-up
Programming ONLY with 6 pulses if
the tap position is different from
midscale position
I2C interface
active till power
down
At the new
programmed position
I2C interface disable after
next power-up
U/D
10V
V
PP
0V
t
t
CL
CH
t
t
PH
CP
CS
t
PC
OPTIONAL LOCKOUT BIT
5 BITS PROGRAM WIPER POSITION
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
(1)(2)
MSOP 8-Lead 3 x 3mm (Z)
SYMBOL
MIN
NOM
MAX
1.10
0.15
0.95
0.38
0.23
3.10
5.00
3.10
A
A1
A2
b
0.05
0.75
0.22
0.13
2.90
4.80
2.90
0.10
0.85
c
D
3.00
4.90
E
E
E1
E1
e
3.00
0.65 BSC
0.60
L
0.40
0º
0.80
6º
L1
L2
θ
0.95 REF
0.25 BSC
TOP VIEW
D
A2
A
DETAIL A
A1
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
L
TOP VIEW
SIDE VIEW
BOTTOM VIEW
SYMBOL
MIN
0.70
0.00
0.45
NOM
0.75
MAX
0.80
0.05
0.65
A2
A
A1
A2
A3
b
A3
0.02
0.55
0.20 REF
0.25
FRONT VIEW
0.20
1.90
1.30
2.90
1.20
0.30
2.10
1.50
3.10
1.40
D
2.00
D2
E
1.40
3.00
E2
e
1.30
050TYP
0.30
L
0.20
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 (1)
Prefix
Device #
Suffix
CAT
5126
Z
I
-10
–
G
T3
Temperature Range
Tape & Reel
Company ID
I = Industrial (-40ºC to 85ºC)
T: Tape & Reel
3: 3,000/Reel
Product Number
Resistance
-10: 10kꢀ
-50: 50kꢀ
-00: 100kꢀ
Lead Finish
G:NiPdAu
Package
Z: MSOP
VP2: TDFN
ORDERING INFORMATION
Ordering Part Number
CAT5126VP2I-10-GT3
CAT5126VP2I-50-GT3 (4)
CAT5126VP2I-00-GT3 (4)
CAT5126ZI-10-GT3
CAT5126ZI-50-GT3 (4)
CAT5126ZI-00-GT3 (4)
Resistor [kꢀ]
Package-Pin Part Per Reel
10
50
TDFN
TDFN
TDFN
MSOP
MSOP
MSOP
3000
3000
3000
3000
3000
3000
100
10
50
100
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, 10kꢀ, 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. Reason
03/14/07
A
B
Initial Issue
Add Top Mark Code link
Add -MD to document number
03/12/08
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© Catalyst Semiconductor, Inc.
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
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Corporate Headquarters
2975 Stender Way
Santa Clara, CA 95054
Phone: 408.542.1000
Fax: 408.542.1200
1Hwww.catsemi.com
Document No: MD-2129
Revision:
B
Issue date:
03/12/08
相关型号：
CAT5126VP2I10-GT3
10K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 32 POSITIONS, PDSO8, 2 X 3 MM, HALOGEN FREE AND ROHS COMPLIANT, MO-229, TDFN-8
ONSEMI
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