MAX5478EUD+ Maxim Integrated Products, MAX5478EUD+ Datasheet

IC POT DGTL DUAL 256-TAP 14TSSOP

MAX5478EUD+

Manufacturer Part Number
MAX5478EUD+
Description
IC POT DGTL DUAL 256-TAP 14TSSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX5478EUD+

Taps
256
Resistance (ohms)
50K
Number Of Circuits
2
Temperature Coefficient
35 ppm/°C Typical
Memory Type
Non-Volatile
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.7 V ~ 5.25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
14-TSSOP
Resistance In Ohms
50K
Number Of Pots
Dual
Taps Per Pot
256
Resistance
325 Ohms
Wiper Memory
Non Volatile
Digital Interface
Serial (2-Wire)
Operating Supply Voltage
2.7 V to 5.25 V
Supply Current
1 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Description/function
Dual, 256 Tap, Nonvolatile, I2C, 50k Digital Potentiometer
Mounting Style
SMD/SMT
Supply Voltage (max)
5.25 V
Supply Voltage (min)
2.7 V
Tolerance
25 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-3379; Rev 4; 1/06
*Future product—contact factory for availability.
Pin Configurations appear at end of data sheet.
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
________________________________________________________________ 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
I
2
C-Interface, Digital Potentiometers
Applications
16 Thin QFN
14 TSSOP
16 Thin QFN
14 TSSOP
16 Thin QFN
14 TSSOP
PIN-PACKAGE
2
C-compati-
Dual, 256-Tap, Nonvolatile,
Ordering Information/Selector Guide
♦ Power-On Recall of Wiper Position from
♦ EEPROM Write Protection
♦ Tiny 3mm x 3mm x 0.8mm Thin QFN Package
♦ 70ppm/°C End-to-End Resistance Temperature
♦ 10ppm/°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
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
8
POR
2
C-Compatible Serial Interface
MEMORY
16-BIT
LATCH
16-BIT
NV
MAX5477
MAX5478
MAX5479
Functional Diagram
MARK
ABO
ABQ
TOP
ABP
8
8
POSITION
DECODER
POSITION
DECODER
256
256
PACKAGE CODE
256
256
Features
T1633F-3
T1633F-3
T1633F-3
U14-1
U14-1
U14-1
HA
WA
LA
HB
WB
LB
1

Related parts for MAX5478EUD+

MAX5478EUD+ 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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