MAXIM DS4301 Technical data
General Description
The DS4301 is a single 32-position linear digital potentiometer 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
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 telephones and PDAs.
Applications
White LED Backlight Brightness Control
Portable Battery-Powered Devices such as PDAs
and Cellular Phones
Any Application that Requires a Small, Low-Cost
NV Potentiometer
Features
♦ Single, 32-Position, 200kΩ Linear Nonvolatile (NV)
Potentiometer Ideal for Battery-Powered
Applications
♦ Three-Terminal Increment/Decrement Interface to
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
DS4301
Nonvolatile, 32-Position Digital Potentiometer
______________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
V
CC
CS
L
WGND
H
U/D
INC
µSOP
TOP VIEW
DS4301
Pin Configuration
Ordering Information
V
CC
V
CC
V
CC
V
CC
V
REF
V
CC
ADJ
EXT
CS
FB
GND PGND
W
H
L
WHITE LED
CURRENT
REGULATOR
R
FB
WHITE
LEDs
10µH
MBR0540
1µF
1µF
10µF
GND
CS
INC
U/D
0.1µF
CONTROL
INTERFACE
DS4301
Typical Operating Circuit
Rev 0; 8/03
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.
PART TEMP RANGE PIN-PACKAGE
DS4301U-200 -40°C to +85°C
8 µSOP (118 mil)
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DS4301
Nonvolatile, 32-Position Digital Potentiometer
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATION CONDITIONS
(VCC= V
CC MIN
to V
CC MAX
; TA= -40°C to +85°C, unless otherwise specified.)
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.
Voltage Range on VCCPin Relative to Ground .....-0.5V to +6.0V
Voltage Range on
CS, INC, U/D, L, W, H Pins
Relative to Ground*.....................................-0.5V to V
CC
+ 0.5V
Wiper Current .....................................................................±3mA
Operating Temperature Range ...........................-40°C to +85°C
Programming Temperature.....................................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
*Not to exceed 6.0V
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage V
CC
(Note 1)
V
Input Logic 1 (CS, INC, U/D)V
IH
V
Input Logic 0 (CS, INC, U/D)V
IL
V
Resistor Inputs
V
Wiper Current I
W
-1 +1 mA
DC ELECTRICAL CHARACTERISTICS
(VCC= V
CC MIN
to V
CC MAX
; TA= -40°C to +85°C, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Leakage I
L
-1 +1 µA
3V 30 60
Standby Current (Note 2) I
STBY
5V 15 60
µA
Digital Input Capacitance C
I/O
10 pF
ANALOG RESISTOR CHARACTERISTICS
(VCC= V
CC MIN
to V
CC MAX
; TA= -40°C to +85°C, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
End-to-End Resistor Tolerance TA = +25°C -20
%
Wiper Resistance R
W
Ω
Absolute Linearity (Note 3)
LSB
Relative Linearity (Note 4)
LSB
End-to-End Temp Coefficient
ppm/°C
Ratiometric Temp Coefficient 7
ppm/°C
L, H, W -0.3 V
+2.4 +5.5
0.7 x V
CC
-0.3 +0.3 x V
V
+ 0.3
CC
+ 0.3
CC
CC
+20
500 2000
-0.5 +0.5
-0.25 +0.25
-250 +250
DS4301
Nonvolatile, 32-Position Digital Potentiometer
_____________________________________________________________________ 3
Note 1: All voltages are referenced to ground.
Note 2:
STBY
specified for VCCequal to 3.0V and 5.0V while control port logic pins are driven to VCCor GND.
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
CC
has reached a
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
CC MIN
has been reached.
Note 9: The maximum number of EEPROM write cycles is guaranteed by design and is not tested in production.
AC ELECTRICAL CHARACTERISTICCS
(VCC= V
CC MIN
to V
CC MAX
; TA= -40°C to +85°C. See Figure 2 for timing diagram.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CS to INC Setup t
CI
50 ns
U/D to INC Setup t
DI
ns
INC Low Period t
IL
50 ns
INC High Period t
IH
ns
INC Inactive to CS Inactive t
IC
ns
CS Deselect Time t
CPH
ns
Wiper Change to INC Low t
IW
ns
INC Rise and Fall Times tR, t
F
5µs
INC Low to CS Inactive t
IK
(Note 5) 50 ns
Wiper Storage Time t
WST
(Note 6) 10 ms
CS Low Pulse t
CLP
ns
Wiper Load Time t
WLT
(Note 7)
µs
Power-Up Time t
PU
(Note 8) 2 ms
NONVOLATILE MEMORY CHARACTERISTICS
(VCC= V
CC
MIN
to V
CC MAX
)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
EEPROM Write Cycles +70°C (Note 9)
100
100
500
100
200
100
500
50,000
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