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DS3905U-020 fiches techniques PDF

Dallas Semiconducotr - Triple 128-Position Nonvolatile Digital Variable Resistor/Switch

Numéro de référence DS3905U-020
Description Triple 128-Position Nonvolatile Digital Variable Resistor/Switch
Fabricant Dallas Semiconducotr 
Logo Dallas Semiconducotr 





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DS3905U-020 fiche technique
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, 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.
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
Features
Three 20k, 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
Ordering Information
PART
DS3904U-020
DS3905U-020
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µSOP
10 µSOP
RESISTANCE
20k+ Hi-Z
20k+ Hi-Z
Pin Configurations
TOP VEIW
SDA 1
SCL 2
VCC 3
GND 4
DS3904
µSOP
8 A0
7 H0
6 H1
5 H2
A1 1
SDA 2
SDL 3
VCC 4
GND 5
DS3905
µSOP
10 A2
9 A0
8 H0
7 H1
6 H2
Typical Operating Circuit
VCC
DS3904/DS3905
0.1µF
VCC
4.7k4.7k
RESISTOR 0
20k
ADDR F8h
2-WIRE
MASTER
(DS3905 ONLY)
SCL
SDA
RESISTOR 1
20k
A0 ADDR F9h
A1
A2
RESISTOR 2
20k
ADDR FAh
GND
VCC
RHIZ
H0
R10
VCC
INTERFACE EXAMPLES
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
RHIZ
H1
R11
VIN
DIGITAL
LOGIC
2-WIRE
ADDRESSABLE
SWITCH (USING 00h
AND RHIZ SETTINGS)
RHIZ
H2
GAIN
CONTROL
R12
_____________________________________________ Maxim Integrated Products 1
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.

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