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)

查询DS4301供应商

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

DS4301

Nonvolatile, 32-Position Digital Potentiometer

4 _____________________________________________________________________

Typical Operating Characteristics

(VCC= 5.0V; TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. VOLTAGE

DS4301 toc01

VOLTAGE (V)

SUPPLY CURRENT (µA)

54321

5

10

15

20

30

25

35

0

0

CS = INC = U/D = V

CC

POWER-UP
POWER-DOWN

SUPPLY CURRENT vs. TEMPERATURE

DS4301 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

603510-15

5

10

15

20

25

30

0

-40 85

VCC = 3V

VCC = 5V

CS = INC = U/D = V

CC

W-L RESISTANCE

vs. POTENTIOMETER SETTING

DS4301 toc03

POTENTIOMETER SETTING (DEC)

W-L RESISTANCE (kΩ)

302515 20105

25

50

75

100

125

150

175

200

0

0

AT VCC = 5V AND 3V

W-L RESISTANCE vs. SUPPLY VOLTAGE

(POWER-UP)

DS4301 toc04

SUPPLY VOLTAGE (V)

W-L RESISTANCE (kΩ)

54321

50

100

150

200

250

0

0

>1MΩ

EEPROM RECALL

WIPER = POS 15

W-L RESISTANCE vs. SUPPLY VOLTAGE

(POWER-DOWN)

DS4301 toc05

SUPPLY VOLTAGE (V)

W-L RESISTANCE (kΩ)

54321

50

100

150

200

250

0

0

>1MΩ

WIPER = POS 15

WIPER RESISTANCE vs. WIPER VOLTAGE

DS4301 toc06

WIPER VOLTAGE (V)

WIPER RESISTANCE (Ω)

431 2

50

100

150

200

300

250

350

400

0

05

VCC = 3V

VCC = 5V

ABSOLUTE LINEARITY vs. WIPER POSITION

DS4301 toc07

WIPER POSITION (DEC)

ABSOLUTE LINEARITY (LSB)

302010

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0.25

-0.25
0

RELATIVE LINEARITY vs. WIPER POSITION

DS4301 toc08

WIPER POSITION (DEC)

ABSOLUTE LINEARITY (LSB)

302010

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0.25

-0.25
0

VOLTAGE DIVIDER PERCENT CHANGE

FROM +25°C vs. TEMPERATURE

DS4301 toc09

TEMPERATURE (°C)

% CHANGE (FROM +25°C)

603510-15

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0.05

-0.05

-40 85

WIPER = POS 15
tc = 0.64ppm/°C

WIPER = POS 7
tc = 2.72ppm/°C

WIPER = POS 7

tc = 2.72ppm/°C

WIPER = POS 15
tc = 1.37ppm/°C

WIPER = POS 23

tc = 0ppm/°C

DS4301

Nonvolatile, 32-Position Digital Potentiometer

_____________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= 5.0V; TA = +25°C, unless otherwise noted.)

END-TO-END RESISTANCE PERCENT

CHANGE FROM +25°C vs. TEMPERATURE

DS4301 toc10

TEMPERATURE (°C)

% CHANGE (FROM +25°C)

6040200-20

-4

-3

-2

-1

0

1

2

3

4

5

-5

-40 80

-37.18ppm/°C = tc

-148.38ppm/°C = tc

TEMPERATURE COEFFICIENT

vs. POTENTIOMETER SETTING

DS4301 toc11

POTENTIOMETER SETTING (DEC)

TEMPERATURE COEFFICIENT (ppm/°C)

302515 20105

-8

-6

-4

-2

0

2

4

6

8

10

-10
0

25°C TO 85°C
+25°C TO -40°C

Pin Description

PIN NAME FUNCTION

1 INC

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.

2U/D

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.

3 H High-End Terminal of the Potentiometer

4 GND Ground Terminal

5 W Wiper Terminal of the Potentiometer

6 L Low-End Terminal of the Potentiometer

7 CS

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.

8VCCPower Supply Terminal

DS4301

Detailed Description

The DS4301 is a single nonvolatile digital potentiome­ter. This 32-position linear potentiometer has an end-to­end 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

On power-up, once a stable supply voltage of V

CC MIN

has been reached, the stored wiper setting is loaded
from the EEPROM within t

WLT

. Also on power-up, the
DS4301 wiper control pins become active approximate­ly tPUafter a stable supply voltage of V

CC MIN

has

been reached.

Wiper Control

Adjusting the wiper of the DS4301 involves using the
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
set more than tDIbefore the INC signal is transitioned
from high to low. After the CS pin is active low, a high­to-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 with­out 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

The other method is used to store a new wiper setting
in the EEPROM. This is done by bringing the state of
the INC pin high for a time of tICbefore bringing the
state of the CS pin high. Once the states of both CS
and INC pins are high, the current wiper setting is
stored in EEPROM after a time of t

WST

. If power is

Nonvolatile, 32-Position Digital Potentiometer

6 _____________________________________________________________________

V

CC

GND

CS

INC

U/D

CONTROL

LOGIC UNIT

NONVOLATILE

MEMORY

5-BIT

WIPER

SETTING

POS 31

POS 0

H

L
W

V

CC

Figure 1. Block Diagram

CS

INC

U/D

t

CI

t

IL

t

IH

t

F

t

IC

t

WST

t

CPH

t

DI

t

R

WIPER STORAGE

CONDITION

WIPER NON-STORAGE

CONDITION

WIPER POSITION

POSITION X POSITION X + 1 POSITION X

t

IW

t

IW

t

IK

POSITION X - 1

V

IL

V

IL

V

IL

V

IH

V

IH

t

CLP

Figure 2. Timing Diagram

DS4301

Nonvolatile, 32-Position Digital Potentiometer

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.

cycled to the device, the wiper setting that was just
stored is the setting loaded on power-up.

Wiper storage does not have to occur immediately after
a change in wiper position. At anytime the current wiper
position can be stored to the EEPROM by simply issu­ing a low pulse to the CS pin for t

CLP

while the INC pin

remains in a high state. The wiper does not move dur­ing this action and the current wiper setting is stored in
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
VCC. Every time power is cycled to the DS4301, the
desired wiper setting is loaded from EEPROM, and
since CS is tied to VCC, no changes can be made to
the wiper setting.

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 EEP­ROM 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

WLT

of

V

CC

reaching a stable voltage level greater than or

equal to V

CC MIN

. If EEPROM wear-out has occurred,

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 high­frequency response for decoupling applications.

Chip Information

TRANSISTOR COUNT: 3512

SUBSTRATE INFO: P-substrate

Package Information

For the latest package outline information, go to

www.maxim-ic.com/DallasPackInfo

.