ds3906ut-r Maxim Integrated Products, Inc., ds3906ut-r Datasheet

ds3906ut-r

Manufacturer Part Number

ds3906ut-r

Description

Ds3906 Triple Nv Low Step Size Variable Resistor Plus Memory

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.DS3906UT-R.pdf (14 pages)

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Download datasheet (251Kb)

The DS3906 is intended for low resistance, small step-

size applications. It contains three nonvolatile (NV), low-

temperature coefficient, variable digital resistors that

are capable of ohm and subohm increments when

used in parallel with a fixed external resistor. All three of

the DS3906’s resistors have 64 positions (plus a high-Z

state) with a pseudo-log response cleverly chosen to

have a linear equivalent resistance when paired with an

external resistor (see graphs below). The DS3906 also

contains 16 bytes of user EEPROM that, in addition to

the resistors, are controlled through an I

ble serial interface. Three address pins allow up to

eight DS3906s to be placed on the same I

The DS3906 can also be factory cutomized to provide a

variety of transfer functions depending on user

requirements. Contact mixedsignal.apps@dalsemi.com

for additional information.

Rev 1; 2/06

Typical Operating Circuit appears at end of data sheet.

Associated Companies, conveys a license under the Philips I

that the system conforms to the I

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.

C is a trademark of Philips Corp. Purchase of I

Low Ohm, Fine Resolution Driver Control for LED

Display Panels

Low Ohm, Fine Resolution Instrumentation Control

200

180

160

140

120

100

RESISTOR 0 AND 1 RESISTANCE vs. POSITION

(WITH AND WITHOUT EXTERNAL RESISTOR)

0, 1

|| (R

EXT

RESISTOR POSITION (dec)

= 105Ω)

0, 1

|| (R

EXT

General Description

0, 1

= 50Ω)

0, 1

|| (R

WITHOUT R

EXT

C Standard Specification as defined by Philips Corp.

= 150Ω)

EXT

Applications

Triple NV Low Step Size Variable

______________________________________________ Maxim Integrated Products

3000

2500

2000

1500

100

500

C™-compati-

C bus.

C components of Maxim Integrated Products, Inc., or one of its sublicensed

DS3906

C Patent Rights to use these components in an I

♦ Three Programmable Resistors for Low Step-Size

♦ Resistor Settings are NV

♦ 16-Byte NV User Memory (EEPROM)

♦ I

♦ Up to 8 Devices Can be Multidropped on the

♦ Low Power Consumption

♦ Wide Operating Voltage (2.7V to 5.5V)

♦ Operating Temperature Range: -40°C to +85°C

+Denotes lead-free package.

T&R denotes tape-and-reel package.

DS3906U

DS3906U+

DS3906U+T&R

DS3906U/T&R

Applications (Ohm and Subohm)

Same I

Resistor Plus Memory

C-Compatible Serial Interface

TOP VEIW

PART

EXT0

EXT1

EXT2

C Bus

350

300

250

200

150

100

GND

SDA

SCL

(WITH AND WITHOUT EXTERNAL RESISTOR)

RESISTOR 2 RESISTANCE vs. POSITION

|| (R

-40°C to +85°C

TEMP RANGE

Ordering Information

EXT

RESISTOR POSITION (dec)

= 310Ω)

DS3906

µSOP

= 250Ω)

Pin Configuration

|| (R

Resistor Plots

WITHOUT R

EXT

= 400Ω)

C system, provided

EXT

PIN-PACKAGE

10 µSOP

Features

1600

1400

1200

1000

800

600

400

Related parts for ds3906ut-r

ds3906ut-r Summary of contents

Page 1

... R1 R 100 500 EXT components of Maxim Integrated Products, Inc., or one of its sublicensed 2 C Patent Rights to use these components ______________________________________________ Maxim Integrated Products 2 C Bus Ordering Information PART TEMP RANGE PIN-PACKAGE -40°C to +85°C 10 µSOP -40°C to +85°C 10 µ ...

Page 2

Triple NV Low Step Size Variable Resistor Plus Memory ABSOLUTE MAXIMUM RATINGS Voltage SDA, SCL, and H0-H2 Pins CC Relative to Ground.............................................-0.5V to +6.0V Voltage on A0, A1, and A2 Relative to Ground .....-0. ...

Page 3

AC ELECTRICAL CHARACTERISTICS (See Figure +2.7V to 5.5V -40°C to +85°C, unless otherwise noted. Timing referenced PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between Stop and Start Conditions Hold Time ...

Page 4

Triple NV Low Step Size Variable Resistor Plus Memory (V = +5.0V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 200 180 160 140 120 100 2.70 3.20 3.70 4.20 ...

Page 5

T = +25°C, unless otherwise noted RESISTOR R TEMPERATURE COEFFICIENT 0,1 (+25°C TO +85°C) vs. RESISTOR SETTING 400 350 +25°C TO +85°C 300 250 200 150 100 ...

Page 6

Triple NV Low Step Size Variable Resistor Plus Memory (V = +5.0V +25°C, unless otherwise noted RESISTANCE AT POSITION 1Fh 2 vs. POWER-UP VOLTAGE 4000 >5.5MΩ RESISTOR R 2 3500 3000 2500 EEPROM RECALL 2000 ...

Page 7

PIN NAME Address Input. Inputs A0, A1, and A2 determine the SDA I C Serial Data Open-Drain Input/Output 2 3 SCL I C Serial Clock Input 4 V Power Supply Voltage CC ...

Page 8

Triple NV Low Step Size Variable Resistor Plus Memory makes the corresponding resistor go High-Z. Plots for both resistor sizes are shown on the front page of this data sheet. It can be seen that, when an external resis- tor ...

Page 9

Table 3. DS3906 Resistor Settings (without external resistor) NOMINAL RESISTOR VALUES POSITION WITHOUT EXT RESISTOR (25°C) Dec Hex Resistors 175 178 182 186 190 195.2 6 ...

Page 10

Triple NV Low Step Size Variable Resistor Plus Memory External Resistor Selection/Considerations Using an external resistor in parallel with any of the DS3906’s resistors makes the effective resistance linear with small increments from position to position. Typical values for the ...

Page 11

Repeated Start Condition: The master can use a repeated start condition at the end of one data transfer to indicate that it will immediately initiate a new data trans- fer following the current one. Repeated starts are com- monly used ...

Page 12

Triple NV Low Step Size Variable Resistor Plus Memory Acknowledge Polling: Any time an EEPROM page is written, the DS3906 requires the EEPROM write time (t ) after the stop condition to write the contents of the W page to ...

Page 13

Reading Multiple Bytes from a Slave: The read oper- ation can be used to read multiple bytes with a single transfer. When reading bytes from the slave, the master simply ACKs the data byte if it desires to read another ...

Page 14

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation. For the latest package outline information www.maxim-ic.com/DallasPackInfo. Printed USA is a registered trademark of Maxim Integrated Products, Inc. Package Information ...

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