DS4301U-200 [MAXIM]
Digital Potentiometer, 1 Func, 200000ohm, Increment/decrement Control Interface, 32 Positions, PDSO8, 0.118 INCH, MICRO,SOP-8;
| 型号： | DS4301U-200 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Digital Potentiometer, 1 Func, 200000ohm, Increment/decrement Control Interface, 32 Positions, PDSO8, 0.118 INCH, MICRO,SOP-8 光电二极管 转换器 电阻器 |
| 文件： | 总7页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Rev 0; 8/03
Nonvolatile, 32-Position Digital Potentiometer
General Description
Features
The DS4301 is a single 32-position linear digital poten-
tiometer with 200kΩ end-to-end resistance. The wiper
setting is stored in EEPROM, so the DS4301 powers up
with the last stored setting. The position of the wiper is
♦ Single, 32-Position, 200kΩ Linear Nonvolatile (NV)
Potentiometer Ideal for Battery-Powered
Applications
♦ Three-Terminal Increment/Decrement Interface to
controlled through
a
simple three-terminal
increment/decrement interface. The DS4301 is ideal for
white LED backlight brightness control. Its 8-pin µSOP
package, 2.4V to 5.5V supply range, and 200kΩ end-
to-end resistance are especially suited for portable,
battery-powered applications such as cellular tele-
phones and PDAs.
Adjust Wiper Position
♦ Wide Voltage Supply Range (2.4V to 5.5V)
♦ Command-Initiated NV Wiper Storage
♦ Operates Over the Industrial Temperature Range
(-40°C to +85°C)
♦ Available in 8-Pin µSOP
Ordering Information
Applications
White LED Backlight Brightness Control
PART
TEMP RANGE
PIN-PACKAGE
Portable Battery-Powered Devices such as PDAs
and Cellular Phones
DS4301U-200
-40°C to +85°C
8 µSOP (118 mil)
Any Application that Requires a Small, Low-Cost
NV Potentiometer
Pin Configuration
TOP VIEW
INC
U/D
H
1
2
3
4
8
7
6
5
V
CC
CS
L
DS4301
GND
W
µSOP
Typical Operating Circuit
V
CC
10µH
10µF
MBR0540
V
CC
V
CC
V
REF
1µF
H
V
CC
1µF
0.1µF
DS4301
W
V
CC
EXT
CS
WHITE
LEDs
WHITE LED
CURRENT
REGULATOR
CONTROL
INTERFACE
ADJ
CS
FB
INC
U/D
L
GND
GND
PGND
R
FB
______________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Nonvolatile, 32-Position Digital Potentiometer
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
Pin Relative to Ground .....-0.5V to +6.0V
Programming Temperature.....................................0°C to +70°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
CC
Voltage Range on CS, INC, U/D, L, W, H Pins
Relative to Ground*.....................................-0.5V to V
Wiper Current ..................................................................... 3mA
+ 0.5V
CC
Operating Temperature Range ...........................-40°C to +85°C
*Not to exceed 6.0V
Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATION CONDITIONS
(V
= V
to V
; T = -40°C to +85°C, unless otherwise specified.)
A
CC MAX
CC
CC MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
+2.4
0.7 x V
-0.3
TYP
MAX
+5.5
+ 0.3
UNITS
Supply Voltage
V
(Note 1)
V
V
CC
Input Logic 1 (CS, INC, U/D)
Input Logic 0 (CS, INC, U/D)
Resistor Inputs
V
V
CC
IH
CC
V
+0.3 x V
V
IL
CC
L, H, W
-0.3
V
+ 0.3
+1
V
CC
Wiper Current
I
-1
mA
W
DC ELECTRICAL CHARACTERISTICS
(V
= V
to V
; T = -40°C to +85°C, unless otherwise specified.)
CC MAX A
CC
CC MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
+1
UNITS
Input Leakage
I
-1
µA
L
3V
5V
30
15
60
Standby Current (Note 2)
Digital Input Capacitance
I
µA
pF
STBY
60
C
10
I/O
ANALOG RESISTOR CHARACTERISTICS
(V
= V
to V
; T = -40°C to +85°C, unless otherwise specified.)
CC MAX A
CC
CC MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
+20
UNITS
%
End-to-End Resistor Tolerance
Wiper Resistance
T
= +25°C
-20
A
R
500
2000
+0.5
+0.25
+250
Ω
W
Absolute Linearity
(Note 3)
(Note 4)
-0.5
-0.25
-250
LSB
Relative Linearity
LSB
End-to-End Temp Coefficient
Ratiometric Temp Coefficient
ppm/°C
ppm/°C
7
2
_____________________________________________________________________
Nonvolatile, 32-Position Digital Potentiometer
AC ELECTRICAL CHARACTERISTICCS
(V
= V
to V
; T = -40°C to +85°C. See Figure 2 for timing diagram.)
CC MAX A
CC
CC MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
50
TYP
MAX
UNITS
ns
CS to INC Setup
t
t
CI
DI
U/D to INC Setup
100
50
ns
INC Low Period
t
ns
IL
INC High Period
t
t
100
500
100
ns
IH
IC
INC Inactive to CS Inactive
CS Deselect Time
Wiper Change to INC Low
INC Rise and Fall Times
INC Low to CS Inactive
Wiper Storage Time
CS Low Pulse
ns
t
ns
CPH
t
200
5
ns
IW
t , t
R
µs
F
t
(Note 5)
(Note 6)
50
ns
IK
t
t
10
ms
ns
WST
t
100
CLP
Wiper Load Time
(Note 7)
(Note 8)
500
2
µs
WLT
Power-Up Time
t
ms
PU
NONVOLATILE MEMORY CHARACTERISTICS
(V
= V
to V
)
CC MAX
CC
CC
MIN
PARAMETER
EEPROM Write Cycles
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
+70°C (Note 9)
50,000
Note 1: All voltages are referenced to ground.
Note 2: specified for V equal to 3.0V and 5.0V while control port logic pins are driven to V or GND.
CC
STBY
CC
Note 3: Absolute linearity is used to determine wiper voltage versus expected voltage as determined by wiper position.
Note 4: Relative linearity is used to determine the change of wiper voltage between two adjacent wiper positions.
Note 5: The INC low to CS inactive time is the transition time that allows the three control pins to become inactive without writing
the wiper position to the EEPROM.
Note 6: Wiper storage time is the time required for the wiper position to be written to the EEPROM. During this time, the three-ter-
minal interface is inactive.
Note 7: Wiper load time is specified as the time required to load the wiper position stored in EEPROM once V
has reached a
CC
stable operating voltage greater than or equal to V
.
CC MIN
Note 8: Power-up time is specified as the time required before the three control pins become active once a stable power supply
level of at least V has been reached.
CC MIN
Note 9: The maximum number of EEPROM write cycles is guaranteed by design and is not tested in production.
_____________________________________________________________________
3
Nonvolatile, 32-Position Digital Potentiometer
Typical Operating Characteristics
(V
= 5.0V; T = +25°C, unless otherwise noted.)
A
CC
W-L RESISTANCE
vs. POTENTIOMETER SETTING
SUPPLY CURRENT vs. VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
35
30
200
CS = INC = U/D = V
CC
AT V = 5V AND 3V
CC
30
25
20
15
10
5
25
20
15
10
5
175
150
V
V
= 3V
= 5V
CC
CC
125
100
75
50
25
0
POWER-UP
POWER-DOWN
CS = INC = U/D = V
CC
0
0
0
5
10
15
20
25
30
0
1
2
3
4
5
-40
-15
10
35
60
85
POTENTIOMETER SETTING (DEC)
VOLTAGE (V)
TEMPERATURE (°C)
W-L RESISTANCE vs. SUPPLY VOLTAGE
(POWER-UP)
W-L RESISTANCE vs. SUPPLY VOLTAGE
(POWER-DOWN)
WIPER RESISTANCE vs. WIPER VOLTAGE
250
200
150
100
50
250
200
150
100
50
400
350
300
250
200
150
100
50
>1MΩ
>1MΩ
V
= 3V
CC
V
= 5V
CC
WIPER = POS 15
EEPROM RECALL
WIPER = POS 15
0
0
0
0
1
2
3
4
5
0
1
2
3
4
5
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
WIPER VOLTAGE (V)
VOLTAGE DIVIDER PERCENT CHANGE
FROM +25°C vs. TEMPERATURE
ABSOLUTE LINEARITY vs. WIPER POSITION
RELATIVE LINEARITY vs. WIPER POSITION
0.05
0.04
0.03
0.02
0.01
0
0.25
0.20
0.15
0.10
0.05
0
0.25
0.20
0.15
0.10
0.05
0
WIPER = POS 15
tc = 1.37ppm/°C
WIPER = POS 7
tc = 2.72ppm/°C
WIPER = POS 15
tc = 0.64ppm/°C
-0.01
-0.02
-0.03
-0.04
-0.05
-0.05
-0.10
-0.15
-0.20
-0.25
-0.05
-0.10
-0.15
-0.20
-0.25
WIPER = POS 23
tc = 0ppm/°C
WIPER = POS 7
tc = 2.72ppm/°C
-40
-15
10
35
60
85
0
10
20
30
0
10
20
30
TEMPERATURE (°C)
WIPER POSITION (DEC)
WIPER POSITION (DEC)
4
_____________________________________________________________________
Nonvolatile, 32-Position Digital Potentiometer
Typical Operating Characteristics (continued)
(V
= 5.0V; T = +25°C, unless otherwise noted.)
A
CC
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
TEMPERATURE COEFFICIENT
vs. POTENTIOMETER SETTING
5
10
8
4
3
2
25°C TO 85°C
+25°C TO -40°C
6
4
-37.18ppm/°C = tc
-148.38ppm/°C = tc
1
0
2
0
-1
-2
-3
-4
-5
-2
-4
-6
-8
-10
-40
-20
0
20
40
60
80
0
5
10
15
20
25
30
TEMPERATURE (°C)
POTENTIOMETER SETTING (DEC)
Pin Description
PIN
NAME
FUNCTION
Increment/Decrement Wiper Control. When INC transitions from high-to-low, the wiper moves in the
direction established by the state of the U/D pin.
1
INC
Up/Down Control. Sets the directions of wiper movement. When set to a high state, a high-to-low
transition on the INC pin increments the wiper. When set to a low state, a high-to-low transition on the
INC pin decrements the wiper.
2
U/D
3
4
5
6
H
GND
W
High-End Terminal of the Potentiometer
Ground Terminal
Wiper Terminal of the Potentiometer
Low-End Terminal of the Potentiometer
L
Chip Select. When set to a low state, the wiper position can be adjusted using U/D and INC. When in
a high-state, activity on INC and U/D does not affect or change the wiper position.
7
8
CS
V
Power Supply Terminal
CC
_____________________________________________________________________
5
Nonvolatile, 32-Position Digital Potentiometer
Wiper Control
Adjusting the wiper of the DS4301 involves using the
V
CC
H
three control pins (U/D, CS, and INC). See the Timing
Diagram in Figure 2. To enable wiper adjustment, a
high-to-low transition on the CS pin is required. Hold
CS low for the duration of the communication. Doing
this enables the INC pin to change the wiper position.
Set the U/D pin high to increment or low to decrement
the wiper position. The state of the U/D pin should be
POS 31
V
CC
CS
INC
U/D
5-BIT
WIPER
SETTING
CONTROL
LOGIC UNIT
set more than t before the INC signal is transitioned
DI
POS 0
GND
from high to low. After the CS pin is active low, a high-
to-low transition on the INC pin moves the wiper in the
direction dictated by the U/D pin. Continue to pulse
INC (high to low) until the desired wiper position is
reached. On the last edge, hold the INC line low. With
the desired wiper position set, there are two ways to
proceed. One method terminates communication with-
out allowing the value of the current wiper position to
be written to the EEPROM. This is done by transitioning
the CS signal to the high state before bringing the INC
signal high. As long as the state of the CS pin is high
before the state of the INC pin goes high, the current
wiper setting is not written to EEPROM. Because the
current wiper setting was not stored to the NV memory,
the previously stored wiper setting, not the current
wiper setting, is loaded from memory if power is cycled
to the device
NONVOLATILE
MEMORY
L
W
Figure 1. Block Diagram
Detailed Description
The DS4301 is a single nonvolatile digital potentiome-
ter. This 32-position linear potentiometer has an end-to-
end resistance of 200kΩ, and operates over a wide
2.4V to 5.5V supply voltage range. The wiper position is
controlled by the three interface pins (U/D, CS, and
INC), and the wiper setting can be stored in EEPROM
on command.
Power-Up
The other method is used to store a new wiper setting
in the EEPROM. This is done by bringing the state of
On power-up, once a stable supply voltage of V
CC MIN
has been reached, the stored wiper setting is loaded
the INC pin high for a time of t before bringing the
IC
from the EEPROM within t
. Also on power-up, the
state of the CS pin high. Once the states of both CS
and INC pins are high, the current wiper setting is
WLT
DS4301 wiper control pins become active approximate-
ly t
after a stable supply voltage of V
has
CC MIN
stored in EEPROM after a time of t
. If power is
PU
WST
been reached.
WIPER STORAGE
CONDITION
WIPER NON-STORAGE
CONDITION
t
CLP
CS
INC
U/D
V
IH
t
CPH
V
IL
t
WST
t
IH
t
F
t
CI
t
IC
t
IK
t
IL
V
IH
V
IL
t
DI
t
R
V
IL
t
t
IW
IW
POSITION X
POSITION X + 1
POSITION X
POSITION X - 1
WIPER POSITION
Figure 2. Timing Diagram
6
_____________________________________________________________________
Nonvolatile, 32-Position Digital Potentiometer
cycled to the device, the wiper setting that was just
Chip Information
stored is the setting loaded on power-up.
TRANSISTOR COUNT: 3512
Wiper storage does not have to occur immediately after
SUBSTRATE INFO: P-substrate
a change in wiper position. At anytime the current wiper
position can be stored to the EEPROM by simply issu-
Package Information
ing a low pulse to the CS pin for t
while the INC pin
CLP
For the latest package outline information, go to
remains in a high state. The wiper does not move dur-
ing this action and the current wiper setting is stored in
www.maxim-ic.com/DallasPackInfo.
EEPROM after t
.
WST
For applications that require a specific wiper setting to
be loaded on power-up and never changed, write the
desired wiper setting to the EEPROM, then tie CS to
V
. Every time power is cycled to the DS4301, the
CC
desired wiper setting is loaded from EEPROM, and
since CS is tied to V , no changes can be made to
the wiper setting.
CC
EEPROM Characteristics
There is a limit to the number of times the EEPROM can
be written to before a wear-out occurs (see the
Nonvolatile Memory Characteristics table). After EEP-
ROM wear-out occurs, the wiper can still be adjusted,
however accurately storing the wiper position is no
longer possible. When power is removed from the part,
the current wiper position is lost. Upon power-up, the
wiper setting stored in EEPROM is loaded within t
of
WLT
V
reaching a stable voltage level greater than or
CC
equal to V
. If EEPROM wear-out has occurred,
CC MIN
the wiper setting that is loaded is unknown.
Application Information
To achieve the best results when using the DS4301,
decouple the power supply with a 0.01µF or 0.1µF
capacitor. Use a high-quality ceramic surface-mount
capacitor when possible. Surface-mount components
minimize lead inductance, improving performace.
Ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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