DS3904U-010 MAXIM [Maxim Integrated Products], DS3904U-010 Datasheet

DS3904U-010

Manufacturer Part Number

DS3904U-010

Description

Triple 128-Position Nonvolatile Digital

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.DS3904U-010.pdf (11 pages)

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The DS3904/DS3905 contain three nonvolatile (NV) low

temperature coefficient, variable digital resistors. Each

resistor has 128 user-selectable positions. Additionally,

the DS3904/DS3905 have a high-impedance setting that

allows each resistor to function as a digital switch. The

DS3904/DS3905 can operate over a 2.7V to 5.5V supply

voltage range, and communication with the device is

achieved through a 2-wire serial interface. Address pins

allow multiple DS3904/DS3905s to operate on the same

two-wire bus. The DS3904 has one address pin, allow-

ing two DS3904s to share the bus, while the DS3905

has three address pins, allowing up to eight DS3905s to

share a common bus. The low-cost and small size of the

DS3904/DS3905 make them ideal replacements for con-

ventional mechanical trimming resistors.

Rev 3; 3/07

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.

Power-Supply Calibration

Cell Phones and PDAs

Fibre Optic Transceiver Modules

Portable Electronics

Small and Low-Cost Replacement for

Conventional Mechanical Trimming Resistors/

Dip Switches

Test Equipment

General Description

Triple 128-Position Nonvolatile Digital

MASTER

2-WIRE

0.1μF

(DS3905 ONLY)

Applications

4.7kΩ

_____________________________________________ Maxim Integrated Products

4.7kΩ

SCL

SDA

GND

DS3904/DS3905

RESISTOR 0

ADDR F8h

RESISTOR 1

ADDR F9h

RESISTOR 2

ADDR FAh

Variable Resistor/Switch

RHIZ

♦ Three 20kΩ Ω , or Two 20kΩ Ω and One 10kΩ Ω , 128-

♦ Resistor Settings are Stored in NV Memory

♦ Each Resistor has a High-Impedance Setting for

♦ Low Temperature Coefficient

♦ 2-Wire Serial Interface

♦ 2.7V to 5.5V Operating Range

♦ -40°C to +85°C Industrial Temperature

♦ Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP

DS3904U-010 -40°C to +85°C 8 μSOP

DS3904U-020 -40°C to +85°C 8 μSOP

DS3905U-020 -40°C to +85°C 10 μSOP

Position Linear Digital Resistors

Switch Operation to Control Digital Logic

for DS3905

PART

GND

SDA

SCL

TOP VEIW

DIGITAL

LOGIC

DS3904

TEMP RANGE

μSOP

INTERFACE EXAMPLES

VARIABLE RESISTANCE

FOR ADJUSTABLE

CURRENT SOURCE

Typical Operating Circuit

2-WIRE

ADDRESSABLE

SWITCH (USING 00h

AND RHIZ SETTINGS)

Ordering Information

GAIN

CONTROL

Pin Configurations

PIN-

PACKAGE

GND

SDA

SDL

RESISTANCE (k )

DS3905

μSOP

20/10/20 + High-Z

20/20/20 + High-Z

Features

(R0/R1/R2)

Related parts for DS3904U-010

DS3904U-010 Summary of contents

Page 1

... Serial Interface ♦ 2.7V to 5.5V Operating Range ♦ -40°C to +85°C Industrial Temperature ♦ Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP for DS3905 PART Applications DS3904U-010 -40°C to +85°C 8 μSOP DS3904U-020 -40°C to +85°C 8 μSOP DS3905U-020 -40°C to +85°C 10 μSOP TOP VEIW SDA 1 SCL ...

Page 2

Triple 128-Position Nonvolatile Variable Digital Resistor/Switch ABSOLUTE MAXIMUM RATINGS Voltage on V Pin Relative to Ground.................-0.5V to +6.0V CC Voltage on SDA, SCL, A0, A1, A2 Relative to Ground*...................................-0. Voltage on H0, H1, and H2 Relative to Ground ...

Page 3

Triple 128-Position Nonvolatile Digital ANALOG RESISTOR CHARACTERISTICS (continued +2.7V to +5.5V -40°C to +85°C, unless otherwise noted PARAMETER SYMBOL Position 7Fh Resistance Position 00h Resistance High Impedance AC ELECTRICAL CHARACTERISTICS (V = +2.7V to ...

Page 4

Triple 128-Position Nonvolatile Digital Variable Resistor/Switch NONVOLATILE MEMORY CHARACTERISTICS (V = +2.7V to +5.5V +70°C PARAMETER SYMBOL EEPROM Writes All voltages are referenced to ground. Note 1: Applies to A0, SDA, SCL for the DS3904 and ...

Page 5

Triple 128-Position Nonvolatile Digital (V = +5.0V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE 160 V = +5V CC 140 120 V = +3V CC 100 80 60 SDA = SCL = ADDRESS ...

Page 6

Triple 128-Position Nonvolatile Digital Variable Resistor/Switch (V = +5.0V +25°C, unless otherwise noted POSITION 3Fh RESISTANCE vs. SUPPLY VOLTAGE 20kΩ RESISTOR 10 10kΩ RESISTOR 5 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ...

Page 7

Triple 128-Position Nonvolatile Digital Pin Description PIN NAME DS3904 DS3905 2-Wire Serial Data. Open-drain SDA 1 2 input/output for 2-wire data. 2-Wire Serial Clock. Input for SCL 2 3 2-wire clock Supply Voltage Terminal CC GND 4 ...

Page 8

Triple 128-Position Nonvolatile Digital Variable Resistor/Switch V CC EEPROM DS3905 RHIZ CONTROL V CC F8h RESISTOR 0 MSB GND RHIZ CONTROL SCL DATA F9h RESISTOR 1 SDA 2-WIRE MSB A0 INTERFACE A1 (DS3905 ONLY) A2 RHIZ CONTROL FAh RESISTOR 2 ...

Page 9

Triple 128-Position Nonvolatile Digital SDA MSB SLAVE ADDRESS SCL 1 2 START CONDITION Figure 2. 2-Wire Data Transfer Protocol SDA t BUF t LOW SCL t HD:STA STOP START Figure 3. 2-Wire AC Characteristics The following bus protocol has been ...

Page 10

Triple 128-Position Nonvolatile Digital Variable Resistor/Switch COMMAND BYTE MSB LSB MSB START A2* A1* A0 R/W DEVICE IDENTIFIER SLAVE RHIZ OR ADDRESS CONTROL BIT "FAMILY CODE" *DS3904, USE 0's INSTEAD OF A2 AND A1 FOR THE ...

Page 11

Triple 128-Position Nonvolatile Digital The DS3904/DS3905 can operate in the following three modes: 1) Slave Receiver Mode: Serial data and clock are received through SDA and SCL, respectively. After each byte is received, an acknowledge bit is trans- mitted. Start ...

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