MAX5479 Maxim, MAX5479 Datasheet
MAX5479
Manufacturer Part Number
MAX5479
Description
Dual - 256-Tap/ Nonvolatile/ I2C-Interface/ Digital Potentiometers
Manufacturer
Maxim
Datasheet
1.MAX5479.pdf
(15 pages)
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The MAX5477/MAX5478/MAX5479 nonvolatile, dual,
linear-taper, digital potentiometers perform the function
of a mechanical potentiometer, but replace the
mechanics with a simple 2-wire digital interface. Each
device performs the same function as a discrete poten-
tiometer or variable resistor and has 256 tap points.
The devices feature an internal, nonvolatile EEPROM
used to store the wiper position for initialization during
power-up. A write-protect feature prevents accidental
overwrites of the EEPROM. The fast-mode I
ble serial interface allows communication at data rates
up to 400kbps, minimizing board space and reducing
interconnection complexity in many applications. Three
address inputs allow a total of eight unique address
combinations.
The MAX5477/MAX5478/MAX5479 provide three nomi-
nal resistance values: 10kΩ (MAX5477), 50kΩ
(MAX5478), or 100kΩ (MAX5479). The nominal resistor
temperature coefficient is 35ppm/°C end-to-end and
5ppm/°C ratiometric. The low temperature coefficient
makes the devices ideal for applications requiring a low-
temperature-coefficient variable resistor, such as low-
drift, programmable gain-amplifier circuit configurations.
The MAX5477/MAX5478/MAX5479 are available in 16-
pin 3mm x 3mm x 0.8mm thin QFN and 14-pin 4.4mm x
5mm TSSOP packages. These devices operate over
the extended -40°C to +85°C temperature range.
19-3379; Rev 2; 12/04
*Future product—contact factory for availability.
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.
MAX5477ETE*
MAX5477EUD*
MAX5478ETE*
MAX5478EUD
MAX5479ETE*
MAX5479EUD
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
PART
Dual, 256-Tap, Nonvolatile, I
________________________________________________________________ Maxim Integrated Products
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
General Description
Applications
16 Thin QFN
14 TSSOP
16 Thin QFN
14 TSSOP
16 Thin QFN
14 TSSOP
PIN-PACKAGE
2
C-compati-
Ordering Information/Selector Guide
♦ Power-On Recall of Wiper Position from
♦ EEPROM Write Protection
♦ Tiny 3mm x 3mm x 0.8mm Thin QFN Package
♦ 35ppm/°C End-to-End Resistance Temperature
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ Fast 400kbps I
♦ 1µA (max) Static Supply Current
♦ Single-Supply Operation: +2.7V to +5.25V
♦ 256 Tap Positions per Potentiometer
♦ ±0.5 LSB DNL in Voltage-Divider Mode
♦ ±1 LSB INL in Voltage-Divider Mode
†Purchase of I
Products, Inc. or one of its sublicensed Associated
Companies, conveys a license under the Philips I
Rights to use these components in an I
that the system conforms to the I
defined by Philips.
Pin Configurations appear at end of data sheet.
Digital Potentiometers
RESISTANCE (kΩ)
GND
SDA
SCL
V
Nonvolatile Memory
Coefficient
WP
DD
A0
A1
A2
END-TO-END
100
100
10
10
50
50
INTERFACE
REGISTER
SHIFT
8-BIT
I
2
C
2
C components from Maxim Integrated
8
POR
2
C
†
-Compatible Serial Interface
MEMORY
LATCH
16-BIT
16-BIT
NV
MAX5477
MAX5478
MAX5479
Functional Diagram
2
MARK
ABO
ABQ
TOP
ABP
—
—
—
C-Interface,
2
C Standard Specification as
8
8
POSITION
DECODER
POSITION
DECODER
2
www.DataSheet4U.com
C system, provided
256
256
PACKAGE CODE
256
256
Features
T1633F-3
T1633F-3
T1633F-3
2
C Patent
—
—
—
HA
WA
LA
HB
WB
LB
1
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