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Rev 0; 4/06

Triple, 8-Bit NV Variable Resistor

with Dual Settings and User EEPROM

General Description

The DS3901 is a triple, 8-bit nonvolatile (NV) variable

resistor. Each of the resistors has two setting registers,

which are selectable by software or by pin configura-

tion. The selected register determines the value of the

variable resistor. Additionally, all three resistors have a

high-impedance setting. Resistor R0 has the additional

flexibility of allowing an external shunt resistor to pro-

vide increased dynamic range. Internal address set-

tings allow the DS3901 slave address to be

programmed to one of 128 possible addresses. The

DS3901 also features an optional password-protection

scheme that allows the protection of sensitive data.

Features

♦

Three 256-Position Linear Digital Resistors

♦

Full-Scale Resistances 50kΩ, 30kΩ, 20kΩ

♦

Dual NV Settings for Each Resistor

♦

Low Temperature-Coefficient Resistors

C Serial Interface

Wide Operating Voltage (2.4V to 5.5V)

Two-Level Password Write Protection

DS3901

♦

232 Bytes of User EEPROM

♦

Programmable Slave Address

♦

-40°C to +95°C Operating Temperature Range

Applications

Optical Transceivers

Optical Transponders

Instrumentation and Industrial Controls

RF Power Amps

Audio Power-Amp Biasing

Replacement for Mechanical Variable Resistors

and DIP Switches

PART

Ordering Information

TEMP RANGE

RESISTOR

VALUES FOR

R0, R1, AND R2

PIN-

PACKAGE

DS3901E+ -40°C to +95°C

50kΩ, 30kΩ, 20kΩ 14 TSSOP

+Denotes

lead-free package.

Pin Configuration

TOP VIEW

SCL 1

SDA

ADD_SEL

14 V

13 N.C.

DS3901

12 H2

11 L2

10 H1

BK_SEL 4

DIS 5

N.C. 6

GND 7

TSSOP

Typical Operating Circuit appears at end of data sheet.

______________________________________________

Maxim Integrated Products

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.

Triple, 8-Bit NV Variable Resistor

with Dual Settings and User EEPROM

DS3901

ABSOLUTE MAXIMUM RATINGS

Voltage on V

CC,

SDA, SCL Relative to GND .........-0.5V to +6.0V

Voltage on ADD_SEL, BK_SEL, DIS Relative

to GND .................-0.5V to (V

+ 0.5V), not to exceed +6.0V

Voltage on H0, H1, H2, L2, L0 Relative to GND........-0.5V to +6.0V

Maximum Resistor Current....................................................3mA

Operating Temperature Range ...........................-40°C to +95°C

Programming Temperature Range .........................0°C to +70°C

Storage Temperature Range .............................-55°C to +125°C

Soldering Temperature ....................................Refer to IPC/JEDEC

J-STD-020 Specification

Maximum Switch Current ......................................................3mA

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 OPERATING CONDITIONS

= -40°C to +95°C.)

PARAMETER

Supply Voltage

Input Logic 0

(SDA, SCL, ADD_SEL)

Input Logic 1

(SDA, SCL, ADD_SEL)

Input Logic 0 (BK_SEL, DIS)

Input Logic 1 (BK_SEL, DIS)

Voltage on Resistor Inputs

Switch Current

(L0_SW, Hi-Z0, Hi-Z1, Hi-Z2)

SYMBOL

H0, H1,

L0, H2, L2

(Note 2)

(Note 1)

CONDITIONS

MIN

2.4

-0.3

0.7 x

-0.3

2.0

-0.3

TYP

MAX

5.5

0.3 x

0.3

+0.8

0.3

+5.5

UNITS

ELECTRICAL CHARACTERISTICS

= +2.4V to +5.5V, T

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Standby Current

Input Leakage

Low-Level Output Voltage (SDA)

Pulldown Resistance (BK_SEL)

Pullup Resistance (DIS)

BK_SEL Pulse Width

SYMBOL

STBY

OL1

OL2

DIS

3mA sink current

6mA sink current

(Note 3)

-1

CONDITIONS

MIN

TYP

MAX

250

0.4

0.6

UNITS

µA

kΩ

µs

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Triple, 8-Bit NV Variable Resistor

with Dual Settings and User EEPROM

ANALOG RESISTOR CHARACTERISTICS

= +2.4V to +5.5V, T

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Resistor Tolerance

Position 00h Resistance

R0, R2

Position FFh Resistance

Switch Resistance

Absolute Linearity

Relative Linearity

Temperature Coefficient

Hi-Z Resistor Leakage

RHIZ

L0_SW

At 3mA

(Note 4)

(Note 5)

Position FFh (Notes 2, 6)

H0, H1, H2, L0, or L2 = V

-1

-0.75

SYMBOL

CONDITIONS

= +25°C

MIN

-20

242

149

150

+0.75

Ω

LSB

ppm/°C

µA

kΩ

TYP

MAX

+20

500

250

UNITS

Ω

DS3901

C CHARACTERISTICS

= +2.4V to +5.5V, T

= -40°C to +95°C, unless otherwise noted. Timing referenced to V

IL(MAX)

and V

IH(MIN)

PARAMETER

SCL Clock Frequency

Bus Free Time between STOP and

START Condition

Hold Time (Repeated)

START Condition

Low Period of SCL Clock

High Period of SCL Clock

Data Hold Time

Data Setup Time

Start Setup time

Rise Time of Both SDA and SCL

Signals

Fall Time of Both SDA and SCL

Signals

Setup Time for STOP Condition

Capacitive Load for Each Bus Line

EEPROM Write Time

Input Capacitance

Startup Time

SYMBOL

SCL

BUF

HD:STA

LOW

HIGH

HD:DAT

SU:DAT

SU:STA

SU:STO

(Note 8)

(Note 9)

0.3

(Note 8)

(Note 7)

CONDITIONS

MIN

1.3

0.6

1.3

0.6

100

0.6

20 +

0.1C

20 +

0.1C

0.6

400

300

0.9

TYP

MAX

400

UNITS

kHz

µs

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Triple, 8-Bit NV Variable Resistor

with Dual Settings and User EEPROM

DS3901

NONVOLATILE MEMORY CHARACTERISTICS

= +2.4V to +5.5V.)

PARAMETER

EEPROM Write Cycles

SYMBOL

CONDITION

=+ 70 °C (Note 2)

MIN

50,000

TYP

MAX

UNITS

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Note 9:

All voltages referenced to ground.

Guaranteed by design.

STBY

specified for the inactive state measured with SDA = SCL = V

, ADD_SEL = GND, BK_SEL, DIS, H0, H1, H2, L2, L0

floating.

Absolute linearity is the deviation of a measured resistor-setting value from the expected value at each particular resistor

setting. Expected value is calculated by connecting a straight line from the measured minimum setting to the measured

maximum setting.

Relative linearity is the deviation of the step size change between two LSB settings from the expected step size. The expected

LSB step size is the slope of the straight line from measured minimum position to measured maximum position.

See the

Typical Operating Characteristics.

Timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I

C standard mode.

CB—total capacitance of one bus line in picofarads.

EEPROM write begins after a STOP condition occurs.

Typical Operating Characteristics

= +3.3V, T

= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

DS3901 toc01

SUPPLY CURRENT vs. SUPPLY VOLTAGE

DS3901 toc02

SUPPLY CURRENT vs. SCL FREQUENCY

ADD_SEL = GND

SDA = SCL = V

ALL OTHERS ARE FLOATING

DS3901 toc03

185

183

181

SUPPLY CURRENT (µA)

179

177

175

173

171

169

167

165

-40

-13

ADD_SEL = GND

SDA = SCL = V

ALL OTHERS ARE FLOATING

200

190

180

SUPPLY CURRENT (µA)

170

160

150

140

130

ADD_SEL = GND

SDA = SCL = V

ALL OTHERS ARE FLOATING

205

200

SUPPLY CURRENT (µA)

195

190

185

180

120

110

2.400

175

3.175

3.950

4.725

5.500

100 150 200 250 300 350 400

SCL FREQUENCY (kHz)

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

RESISTANCE vs. RESISTOR SETTING

DS3901 toc04

TEMPERATURE COEFFICIENT

vs. RESISTOR SETTING

DS3901 toc05

CHANGE IN RESISTANCE

vs. TEMPERATURE

RESISTOR CHANGE (%)

-3

-8

RESISTOR SETTING = 00h

DS3901 toc06

1000

TEMPERATURE COEFFICIENT (ppm/°C)

900

800

700

600

500

400

300

200

100

R0, -40°C TO +25°C

R1, -40°C TO +25°C

R2, -40°C TO +25°C

R0, +25°C TO +95°C

R1, +25°C TO +95°C

R2, +25°C TO +95°C

RESISTANCE (kΩ)

R0 R1 R2

102

153

204

255

SETTING (DEC)

-13

102

153

204

255

-40

-13

SETTING (DEC)

TEMPERATURE (°C)

_____________________________________________________________________

Triple, 8-Bit NV Variable Resistor

with Dual Settings and User EEPROM

DS3901

Typical Operating Characteristics (continued)

= +3.3V, T

= +25°C, unless otherwise noted.)

CHANGE IN RESISTANCE

vs. TEMPERATURE

DS3901 toc07

RESISTANCE vs. SUPPLY VOLTAGE

DS3901 toc08

RESISTANCE vs. POWER-UP

SUPPLY VOLTAGE

RESISTANCE (kΩ)

> 1MΩ

RESISTOR SETTING = FFh

DS3901 toc09

1.400

1.200

1.000

RESISTOR CHANGE (%)

0800

0.600

0.400

0.200

0.000

-0.200

-0.400

-0.600

-40

-13

RESISTOR SETTING = FFh

0.10

0.08

0.06

RESISTANCE CHANGE (%)

0.04

0.02

-0.02

-0.04

-0.06

-0.08

RESISTOR SETTING = 7Fh

-0.10

2.400

TEMPERATURE (°C)

3.950

4.725

3.175

SUPPLY VOLTAGE (V)

5.500

2.75

SUPPLY VOLTAGE (V)

5.50

RESISTANCE vs. POWER-DOWN

SUPPLY VOLTAGE

RESISTANCE (kΩ)

2.75

SUPPLY VOLTAGE (V)

5.50

> 1MΩ

RESISTOR SETTING = FFh

DS3901 toc10

R0 ABSOLUTE LINEARITY

vs. RESISTOR SETTING

DS3901 toc11

R0 RELATIVE LINEARITY

vs. RESISTOR SETTING

0.65

RELATIVE LINEARITY (LSB)

0.45

0.25

0.05

-0.15

-0.35

-0.55

-0.75

DS3901 toc12

0.65

ABSOLUTE LINEARITY (LSB)

0.45

0.25

0.05

-0.15

-0.35

-0.55

-0.75

102

153

204

255

102

153

204

255

SETTING (DEC)

R1 ABSOLUTE LINEARITY

vs. RESISTOR SETTING

DS3901 toc13

R1 RELATIVE LINEARITY

vs. RESISTOR SETTING

0.65

RELATIVE LINEARITY (LSB)

0.45

0.25

0.05

-0.15

-0.35

-0.55

-0.75

DS3901 toc14

0.65

ABSOLUTE LINEARITY (LSB)

0.45

0.25

0.05

-0.15

-0.35

-0.55

-0.75

102

153

204

255

102

153

204

255

SETTING (DEC)

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