19-3379; Rev 2; 12/04
Dual, 256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
General Description
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
2
C-compati-
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: 10k鈩?(MAX5477), 50k鈩?/div>
(MAX5478), or 100k鈩?(MAX5479). The nominal resistor
temperature coefficient is 35ppm/擄C end-to-end and
5ppm/擄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擄C to +85擄C temperature range.
Features
鈾?/div>
Power-On Recall of Wiper Position from
Nonvolatile Memory
鈾?/div>
EEPROM Write Protection
鈾?/div>
Tiny 3mm x 3mm x 0.8mm Thin QFN Package
鈾?/div>
35ppm/擄C End-to-End Resistance Temperature
Coefficient
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
5ppm/擄C Ratiometric Temperature Coefficient
Fast 400kbps I
2
C
鈥?/div>
-Compatible Serial Interface
1碌A (max) Static Supply Current
Single-Supply Operation: +2.7V to +5.25V
256 Tap Positions per Potentiometer
MAX5477/MAX5478/MAX5479
鈾?/div>
鹵0.5 LSB DNL in Voltage-Divider Mode
鈾?/div>
鹵1 LSB INL in Voltage-Divider Mode
Functional Diagram
V
DD
GND
HA
8-BIT
SHIFT
REGISTER
8
16-BIT
LATCH
8
256
POSITION
DECODER
256
WA
POR
SDA
SCL
WP
A0
A1
A2
I
2
C
INTERFACE
16-BIT
NV
MEMORY
LA
HB
8
256
POSITION
DECODER
256
WB
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
MAX5477
MAX5478
MAX5479
LB
鈥燩urchase
of I
2
C components from Maxim Integrated
Products, Inc. or one of its sublicensed Associated
Companies, conveys a license under the Philips I
2
C Patent
Rights to use these components in an I
2
C system, provided
that the system conforms to the I
2
C Standard Specification as
defined by Philips.
Ordering Information/Selector Guide
PART
MAX5477ETE*
MAX5477EUD*
MAX5478ETE*
MAX5478EUD
MAX5479ETE*
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
16 Thin QFN
14 TSSOP
16 Thin QFN
14 TSSOP
16 Thin QFN
END-TO-END
RESISTANCE (k鈩?
10
10
50
50
100
100
TOP
MARK
ABO
鈥?/div>
ABP
鈥?/div>
ABQ
鈥?/div>
PACKAGE CODE
T1633F-3
鈥?/div>
T1633F-3
鈥?/div>
T1633F-3
鈥?/div>
MAX5479EUD
-40擄C to +85擄C
14 TSSOP
*Future
product鈥攃ontact factory for availability.
Pin Configurations appear at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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