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General Description

The DS3930 contains six 256-position nonvolatile (NV)
potentiometers, 64 bytes of NV user EEPROM memory,
and four programmable NV I/O pins. The six poten-
tiometers all share a common low side. The potentiome-
ters are separated into two groups of three 50k

potentiometers in parallel. Each group of three poten-
tiometers shares a common high side and forms an
equivalent resistance of 16.6k

(three 50k poten-

tiometers in parallel).

Applications

RF Transceivers

Voltage References

Power Supply Calibration

Mobile Phones and PDAs

Fiber Optic Transceiver Modules

Portable Electronics

Radio Tuners

Small, Low-Cost Replacement for Mechanical
Potentiometers

Features

Six 256-Position NV Potentiometers
Four General-Purpose NV I/O Pins
64 Bytes of User EEPROM Memory
0 to 5.5V on Any Potentiometer Terminal,

Independent of V

All Six Potentiometers Share a Common Low Side
Potentiometers Separated into Two Groups of

Three Potentiometers, Each Sharing a Common
High Side

2-Wire Serial Interface
Wide Supply Range (2.7V to 5.5V)
Up to Eight DS3930s Can Share the Same

2-Wire Bus

DS3930

Hex Nonvolatile Potentiometer with

I/O and Memory

_____________________________________________ Maxim Integrated Products

0-2

SDA

TOP VIEW

0-5

3-5

I/O

SCL

I/O

GND

TSSOP

DS3930

Pin Configuration

SDA

GND

SCL

I/O

0-5

0-2

3-5

DECOUPLING CAP

0.1

µF

2-WIRE

INTERFACE

4.7k

DIGITAL

NONVOLATILE I/O

DIGITAL
NONVOLATILE I/O

WIPER
TERMINALS

DS3930

Typical Operating Circuit

Ordering Information

Rev 0; 4/03

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

PIN-PACKAGE

DS3930E

20 TSSOP

DS3930

Hex Nonvolatile Potentiometer with
I/O and Memory

______________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED DC OPERATING CONDITIONS

= -40° to +85°C)

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 on V

Relative to Ground ...................... -0.5V to +6.0V

Voltage on I/O

, I/O

, SDA, SCL, A0, A1, and A2

Relative to Ground* .............................. -0.5V to (V

+ 0.5V)

Voltage on LO

0-5

, W

0-5

, HI

0-2

, and HI

3-5

Relative to Ground ............................................-0.5V to +6.0V

Current Through W

0-5

........................................................ ±1mA

Operating Temperature Range .......................... -40°C to +85°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature.................. See IPC/JEDEC J-STD-020A

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage

(Note 1)

+2.7

+5.5

Input Logic 1 (SDA, SCL, A0, A1,
A2, I/O

, I/O

)

0.7 x

0.3

Input Logic 0 (SDA, SCL, A0, A1,
A2, I/O

, I/O

)

-0.3

0.3 x

Wiper Current

-1

Potentiometer Terminals
(LO

0-5

, W

0-5

, HI

0-2

, and HI

3-5)

= +2.7V to +5.5V

-0.3

+5.5

DC ELECTRICAL CHARACTERISTICS

= +2.7V to +5.5V; T

= -40°C to +85°C, unless otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Leakage

-1

µA

OL1

3mA sink current

0.4

Low-Level Output Voltage (SDA,
I/O

, I/O

)

OL2

6mA sink current

0.6

I/O Capacitance

I/O

I/O Pullup Resistor Value

I/O

3.5

7.0

3V (Note 2)

160

300

Standby Current

STBY

5V (Note 2)

195

350

µA

*This voltage must not exceed 6.0V.

DS3930

Hex Nonvolatile Potentiometer with

I/O and Memory

_____________________________________________________________________

AC ELECTRICAL CHARACTERISTICS

= +2.7V to +5.5V; T

= -40°C to +85°C, unless otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Fast mode

400

SCL Clock Frequency (Note 3)

SCL

Standard mode

100

kHz

Fast mode

1.3

Bus Free Time Between STOP
and START Condition (Note 3)

BUF

Standard mode

4.7

µs

Fast mode

0.6

Hold Time (Repeated) START
Condition (Notes 3 and 4)

HD:STA

Standard mode

4.0

µs

Fast mode

1.3

Low Period of SCL Clock (Note 3)

LOW

Standard mode

4.7

µs

Fast mode

0.6

High Period of SCL Clock
(Note 3)

HIGH

Standard mode

4.0

µs

ANALOG RESISTOR CHARACTERISTICS

= +2.7V to +5.5V; T

= -40°C to +85°C, unless otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

End-to-End Resistance

= +25°C (three 50k

pots in parallel)

13.2

16.5

19.8

Wiper Resistance

400

1000

Factory Default Wiper Setting

Hex

Factory Default I/O Setting

Hex

POT-to-POT Matching

-1

LSB

Differential Linearity

-0.5

+0.5

LSB

Integral Linearity

-1

LSB

End-to-End Temperature
Coefficient

3 potentiometers in parallel

-250

+250

ppm/°C

Ratiometric Temperature
Coefficient

ppm/°C

DS3930

Hex Nonvolatile Potentiometer with
I/O and Memory

______________________________________________________________________

Note 1:

All voltages are referenced to ground.

Note 2:

STBY

specified for V

equal 3.0V and 5.0V, SDA = SCL = V

, and I/O

= I/O

= A0 = A1 = A2 = GND.

Note 3:

A fast-mode device can be used in a standard-mode system, but the requirement t

SU:DAT

> 250ns must then be met.

This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does
stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line t

RMAX

+ t

SU:DAT

= 1000ns

+250ns = 1250ns before the SCL line is released.

Note 4:

After this period, the first clock pulse is generated.

Note 5:

The maximum t

HD:DAT

has only to be met if the device does not stretch the LOW period (t

LOW

) of the SCL signal.

Note 6:

A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V

IH MIN

of the SCL sig-

nal) in order to bridge the undefined region of the falling edge of SCL.

Note 7:

--total capacitance of one bus line in picofarads, timing referenced to 0.9V

and 0.1V

CC.

Note 8:

EEPROM write begins after a STOP condition occurs.

AC ELECTRICAL CHARACTERISTICS (continued)

= +2.7V to +5.5V; T

= -40°C to +85°C, unless otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Fast mode

0.9

Data Hold Time (Notes 3, 5, 7)

HD:DAT

Standard mode

0.9

µs

Fast mode

100

Data Setup Time (Note 3)

SU:DAT

Standard mode

250

Fast mode

0.6

Start Setup Time (Note 3)

SU:STA

Standard mode

4.7

µs

Fast mode

20 + 0.1C

300

Rise Time of Both SDA and SCL
Signals (Note 7)

Standard mode

20 + 0.1C

1000

Fast mode

20 + 0.1C

300

Fall Time of Both SDA and SCL
Signals (Note 7)

Standard mode

20 + 0.1C

300

Fast mode

0.6

Setup Time for STOP Condition

SU:STO

Standard mode

4.0

µs

Capacitive Load for Each Bus

(Note 7)

400

EEPROM Write Time

(Note 8)

EEPROM CHARACTERISTICS

= +2.7V to +5.5V; T

= -40°C to +85°C, unless otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Writes

+70°C

50,000

DS3930

Hex Nonvolatile Potentiometer with

I/O and Memory

_____________________________________________________________________

VOLTAGE DIVIDER % CHANGE

FROM +25

°C vs. TEMPERATURE

DS3930 toc06

TEMPERATURE (

°C)

RESISTANCE % CHANGE (FROM +25

°
C)

-20

-0.15

-0.10

-0.05

0.05

0.10

0.15

0.20

-0.20

-40

100

HI = V

0-5

= GND

POSITION 127

END-TO-END RESISTANCE % CHANGE

FROM +25

°C vs. TEMPERATURE

DS3930 toc05

TEMPERATURE (

°C)

RESISTANCE % CHANGE (FROM +25

°
C)

-20

-0.80

-0.60

-0.40

-0.20

0.20

0.40

0.60

0.80

1.00

-1.00

-40

100

3 POTS IN PARALLEL
MEASURED FROM HI

0-2

TO LO

0-5

WIPER VOLTAGE

vs. POWER-UP VOLTAGE

DS3930 toc04

POWER-UP VOLTAGE (V)

WIPER VOLTAGE (V)

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

1.0

1.5

2.0

2.5

3.0

5.0

HI = 5V, LO = GND
POSITION 127

EEPROM RECALL

FOLLOWS V

CHANGES TO

PROGRAMMED

VALUE ONCE

EEPROM IS

RECALLED

ACTIVE SUPPLY CURRENT

vs. SCL FREQUENCY

DS3930 toc03

SCL FREQUENCY (kHz)

SUPPLY CURRENT (

300

200

100

260

320

380

440

500

560

620

680

740

200

400

= 5V

= 3V

SDA = V

WIPER VOLTAGE vs. WIPER SETTING

DS3930 toc02

SETTING (DEC)

VOLTAGE (V)

250

200

150

100

300

HI = 5V
LO = GND

SUPPLY CURRENT vs. TEMPERATURE

DS3930 toc01

TEMPERATURE (

°C)

SUPPLY CURRENT (

-20

140

160

180

200

220

120

-40

100

= 5V

= 3V

SDA = SCL = 5V

Typical Operating Characteristics

= 5.0V; T

= +25°C, unless otherwise specified.)

ALL POTS DNL (LSB)

DS3930 toc08

POSITION (DEC)

DNL (LSB)

225

200

150 175

50 75 100 125

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

250

POTS 1, 3, 5 INL (LSB)

DS3930 toc09

POSITION (DEC)

INL (LSB)

225

200

150 175

50 75 100 125

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

250

POTS 0, 2, 4, INL (LSB)

DS3930 toc07

POSITION (DEC)

INL (LSB)

225

200

150 175

50 75 100 125

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

250

Part Number DS3930