max5477eud Maxim Integrated Products, Inc., max5477eud Datasheet

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max5477eud

Manufacturer Part Number
max5477eud
Description
Dual, 256-tap, Nonvolatile, I2c-interface, Digital Potentiometers
Manufacturer
Maxim Integrated Products, Inc.
Datasheet

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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
o Power-On Recall of Wiper Position from
o EEPROM Write Protection
o Tiny 3mm x 3mm x 0.8mm Thin QFN Package
o 35ppm/°C End-to-End Resistance Temperature
o 5ppm/°C Ratiometric Temperature Coefficient
o Fast 400kbps I
o 1µA (max) Static Supply Current
o Single-Supply Operation: +2.7V to +5.25V
o 256 Tap Positions per Potentiometer
o ±0.5 LSB DNL in Voltage-Divider Mode
o ±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
16-BIT
LATCH
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
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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max5477eud Summary of contents

Page 1

... Mechanical Potentiometer Replacement Low-Drift Programmable-Gain Amplifiers Volume Control Liquid-Crystal Display (LCD) Contrast Control PART TEMP RANGE MAX5477ETE* -40°C to +85°C MAX5477EUD* -40°C to +85°C MAX5478ETE* -40°C to +85°C MAX5478EUD -40°C to +85°C MAX5479ETE* -40°C to +85°C MAX5479EUD -40° ...

Page 2

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers ABSOLUTE MAXIMUM RATINGS SDA, SCL GND .........................................-0.3V to +6.0V DD All Other Pins to GND.................................-0. Maximum Continuous Current into H_, L_, and W_ MAX5477......................................................................±5.0mA MAX5478......................................................................±1.3mA MAX5479......................................................................±0.6mA Stresses beyond those listed ...

Page 3

Dual, 256-Tap, Nonvolatile, I ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V GND +25°C.) (Note 1) PARAMETER SYMBOL DIGITAL INPUTS Input High Voltage (Note 5) Input Low Voltage Output Low Voltage ...

Page 4

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers TIMING CHARACTERISTICS (continued +2.7V to +5.25V GND +25°C. See Figure 1.) (Notes 8 and 9) A PARAMETER SYMBOL SCL High Time ...

Page 5

Dual, 256-Tap, Nonvolatile +5V GND SUPPLY CURRENT vs. TEMPERATURE 1.0 0.9 0.8 0.7 0.6 0 0.4 0.3 0 0.1 0 ...

Page 6

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers (V = +5V GND +25°C, unless otherwise noted DIFFERENTIAL NONLINEARITY vs. CODE (VRM MODE) 0.10 MAX5478 0.08 0.06 0.04 0.02 0 -0.02 -0.04 ...

Page 7

Dual, 256-Tap, Nonvolatile +5V GND +25°C, unless otherwise noted MIDSCALE WIPER RESPONSE vs. FREQUENCY (MAX5478 50pF -5 ...

Page 8

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers PIN NAME TSSOP THIN QFN Potentiometer A High Terminal Potentiometer A Wiper Terminal Potentiometer A Low Terminal Potentiometer B High Terminal 5 ...

Page 9

Dual, 256-Tap, Nonvolatile 255 R 254 256-POSITION DECODER R 2 CODE 02h Figure 2. Potentiometer Configuration SDA S SCL START CONDITION Figure 3. Start and Stop Conditions SDA 0 1 START MSB SCL Figure ...

Page 10

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers Table 1. Slave Addresses ADDRESS INPUTS GND GND GND GND GND V DD GND V GND DD GND GND GND DD V GND ...

Page 11

Dual, 256-Tap, Nonvolatile, I COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION MAX5477/MAX5478/MAX5479 S SLAVE ADDRESS Figure 7. Command Byte Received HOW CONTROL BYTE AND DATA BYTE MAP INTO MAX5477/MAX5478/MAX5479 REGISTERS ACKNOWLEDGE FROM MAX5477/MAX5478/MAX5479 S SLAVE ADDRESS NOP/W Figure ...

Page 12

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers Table 2. Command Byte Summary ADDRESS BYTE SCL CYCLE START NUMBER ( VREG ...

Page 13

Dual, 256-Tap, Nonvolatile MAX5477 MAX5478 MAX5479 256 WHERE R = END-TO-END RESISTANCE HL AND D = DECIMAL VALUE OF WIPER ...

Page 14

Dual, 256-Tap, Nonvolatile, I Digital Potentiometers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 14 ______________________________________________________________________________________ 2 C-Interface, Package Information ...

Page 15

Dual, 256-Tap, Nonvolatile, I (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely ...

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