IC DGTL POT DUAL 256TAP 16-TQFN

 

MAX5477ETE+T

Manufacturer Part NumberMAX5477ETE+T
DescriptionIC DGTL POT DUAL 256TAP 16-TQFN
ManufacturerMaxim Integrated Products
MAX5477ETE+T datasheets

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Specifications of MAX5477ETE+T

Taps256Resistance (ohms)10K
Number Of Circuits2Temperature Coefficient35 ppm/°C Typical
Memory TypeNon-VolatileInterfaceI²C, 2-Wire Serial
Voltage - Supply2.7 V ~ 5.25 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case16-TQFN Exposed Pad
Resistance In Ohms10KLead Free Status / RoHS StatusLead free / RoHS Compliant
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Download datasheet (711Kb)Embed
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19-3379; Rev 4; 1/06
2
I
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
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 70ppm/°C end-to-end and
10ppm/°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.
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°C to +85°C
*Future product—contact factory for availability.
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
Dual, 256-Tap, Nonvolatile,
♦ Power-On Recall of Wiper Position from
Nonvolatile Memory
♦ EEPROM Write Protection
♦ Tiny 3mm x 3mm x 0.8mm Thin QFN Package
♦ 70ppm/°C End-to-End Resistance Temperature
Coefficient
♦ 10ppm/°C Ratiometric Temperature Coefficient
♦ Fast 400kbps I
2
C-compati-
♦ 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
V
DD
GND
SDA
SCL
WP
A0
Applications
A1
A2
Ordering Information/Selector Guide
END-TO-END
PIN-PACKAGE
RESISTANCE (kΩ)
16 Thin QFN
10
14 TSSOP
10
16 Thin QFN
50
14 TSSOP
50
16 Thin QFN
100
14 TSSOP
100
Features
2
C-Compatible Serial Interface
Functional Diagram
8-BIT
256
256
8
8
SHIFT
16-BIT
POSITION
REGISTER
LATCH
DECODER
POR
16-BIT
NV
2
I
C
MEMORY
256
256
INTERFACE
8
POSITION
DECODER
MAX5477
MAX5478
MAX5479
TOP
PACKAGE CODE
MARK
ABO
T1633F-3
—
ABP
T1633F-3
—
ABQ
T1633F-3
—
HA
WA
LA
HB
WB
LB
U14-1
U14-1
U14-1
1

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MAX5477ETE+T Summary of contents

  • Page 1

    ... MAX5479EUD -40°C to +85°C *Future product—contact factory for availability. Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. Dual, 256-Tap, Nonvolatile, ♦ Power-On Recall of Wiper Position from Nonvolatile Memory ♦ ...

  • 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 +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE (MAX5477) 1 0.8 0 0.4 ...

  • Page 6

    Dual, 256-Tap, Nonvolatile, I Digital Potentiometers (V = +5V GND +25°C, unless otherwise noted INTEGRAL NONLINEARITY vs. CODE (VDM MODE) 0.35 MAX5477 0.30 0.25 0.20 0.15 0.10 0.05 0 ...

  • Page 7

    Dual, 256-Tap, Nonvolatile +5V GND +25°C, unless otherwise noted DIFFERENTIAL NONLINEARITY vs. CODE (VRM MODE) 0.20 MAX5479 0.16 0.12 0.08 0.04 0 -0.04 -0.08 -0.12 -0.16 ...

  • Page 8

    Dual, 256-Tap, Nonvolatile, I Digital Potentiometers (V = +5V GND +25°C, unless otherwise noted TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (MAX5479) 10 MIDSCALE 1 0.1 0.01 0.001 0.0001 ...

  • Page 9

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

  • Page 10

    Dual, 256-Tap, Nonvolatile, I Digital Potentiometers Detailed Description The MAX5477/MAX5478/MAX5479 contain two resistor arrays with 255 elements in each array. The MAX5477 has a total end-to-end resistance of 10kΩ, the MAX5478 has an end-to-end resistance of 50kΩ, and the MAX5479 ...

  • Page 11

    Dual, 256-Tap, Nonvolatile, I Table 2. Write-Protect Behavior of VREG and NVREG COMMAND data is written to VREG. Write to VREG Wiper position updates with I No change to NVREG. No change to VREG or wiper position. ...

  • Page 12

    Dual, 256-Tap, Nonvolatile, I Digital Potentiometers register with input shift register data and change the wiper position. Use valid 3-byte I proper operation. This precautionary operation is nec- essary only when transitioning from write protected ( not ...

  • Page 13

    Dual, 256-Tap, Nonvolatile, I SDA SCL DATA STABLE, CHANGE OF DATA VALID DATA ALLOWED Figure 5. Bit Transfer COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION MAX5477/MAX5478/MAX5479 S SLAVE ADDRESS Figure 7. Command Byte Received HOW CONTROL BYTE AND ...

  • Page 14

    Dual, 256-Tap, Nonvolatile, I Digital Potentiometers 5V H_ 30V W_ MAX5477 MAX5478 MAX5479 MAX480 L_ Figure 9. Positive LCD Bias Control Using a Voltage-Divider VREGxNVREG: Data transfers from the volatile memory register into the nonvolatile memory register. Nonvolatile Memory The ...

  • Page 15

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

  • Page 16

    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.) MARKING D/2 D 0.10 C PKG 8L 3x3 12L 3x3 REF. ...

  • Page 17

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2006 Maxim Integrated Products ...

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