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DS3904

Dallas Semiconducotr
Part Number DS3904
Manufacturer Dallas Semiconducotr
Description Triple 128-Position Nonvolatile Digital Variable Resistor/Switch
Published Mar 30, 2005
Detailed Description Rev 1; 8/03 Triple 128-Position Nonvolatile Digital Variable Resistor/Switch General Description The DS3904/DS3905 cont...
Datasheet PDF File DS3904 PDF File

DS3904
DS3904

Overview
Rev 1; 8/03 Triple 128-Position Nonvolatile Digital Variable Resistor/Switch General Description 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, allowing 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 conventional mechanical trimming resistors.
Features ♦ Three 20kΩ, 128-Position Linear Digital Resistors ♦ Resistor Settings are Stored in NV Memory ♦ Each Resistor has a High-Impedance Setting for Switch Operation to Control Digital Logic ♦ 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 for DS3905 DS3904/DS3905 Ordering Information PART TEMP RANGE -40°C to +85°C -40°C to +85°C PINPACKAGE 8 µSOP 10 µSOP RESISTANCE 20kΩ + Hi-Z 20kΩ + Hi-Z Applications 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 DS3904U-020 DS3905U-020 Pin Configurations TOP VEIW SDA 1 SCL 2 VCC 3 GND 4 8 7 A0 H0 H1 H2 A1 1 SDA 2 SDL 3 VCC GND 4 5 10 A2 9 A0 H0 H1 H2 DS3904 6 5 DS3905 8 7 6 µSOP µSOP Typical Operating Circuit INTERFACE EXAMPLES VCC VCC DS3904/DS3905 0.
1µF 4.
7kΩ 2-WIRE MASTER 4.
7kΩ SCL SDA RESISTOR 1 20kΩ ADDR F9h RHIZ H1 R11 DIGITAL LOGIC 2-WIRE A...


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