DS1804Z-010/T&R datasheet, PDF

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DS1804Z-010/T&R: DescriptionDigital Potentiometer, 10000ohm, Increment/decrement Control Interface, 100 Positions, PDSO8, 0.150 INCH, SOIC-8; CategoryAnalog mixed-signal IC converter; File Size84KB，7 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1804Z-010/T&R Overview

Digital Potentiometer, 10000ohm, Increment/decrement Control Interface, 100 Positions, PDSO8, 0.150 INCH, SOIC-8

DS1804Z-010/T&R Parametric

Parameter Name	Attribute value
Maker	DALLAS
package instruction	0.150 INCH, SOIC-8
Reach Compliance Code	unknown
control interface	INCREMENT/DECREMENT
Converter type	DIGITAL POTENTIOMETER
JESD-30 code	R-PDSO-G8
Number of positions	100
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Certification status	Not Qualified
resistance law	LINEAR
Nominal supply voltage	5 V
surface mount	YES
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal location	DUAL
Nominal total resistance	10000 Ω

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DS1804

NV Trimmer Potentiometer

www.dalsemi.com

FEATURES

Single 100-position taper potentiometer

Nonvolatile “on-demand” wiper storage

Operates from 3V or 5V supplies

Up/down, increment-controlled interface

Available in 8-pin (300-mil) DIP, 8-pin

(150-mil) SOIC, 8-pin (118-mil) µSOP, and

Flip Chip packages

Operating Temperature:

– Industrial:

-40ºC to +85ºC

Standard Resistance Values:

– DS1804-010 10 kΩ

– DS1804-050 50 kΩ

– DS1804-100 100 kΩ

PIN ASSIGNMENT

INC

U/D

GND

8-Pin DIP (300-mil)

8-Pin SOIC (150-mil)

8-Pin uSOP (118-mil)

8-Pin Flip Chip Package

See Mech. Drawings Section

PIN DESCIPTION

INC

GND

High-Terminal of Potentiometer

Low-Terminal of Potentiometer

Wiper of Potentiometer

3V or 5V Power Supply

Chip Select

Up/Down Control

Increment/Decrement Wiper Control

Ground

DESCRIPTION

The DS1804 NV Trimmer Potentiometer is a nonvolatile digital potentiometer having 100 positions. The

device provides an ideal method for low-cost trimming applications using a CPU or manual control input

with minimal external circuitry. Wiper position of the DS1804 can be stored in EEPROM memory on

demand. The device’s wiper position is manipulated by a 3-terminal port that provides an increment/

decrement counter controlled interface. This port consists of the control inputs

INC

, and U/

. The

DS1804 is available in three resistor grades, which include a 10 kΩ, 50 kΩ, and 100 kΩ. The device is

provided in an industrial temperature grade. Additionally, the DS1804 will operate from 3V or 5V

supplies and is ideal for portable application requirements. Three packaging options are available and

include the 8-pin (300-mil) DIP, 8-pin (150-mil) SOIC, 8-pin (118-mil) uSOP, and the Flip Chip

Package.

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DS1804

DS1804 BLOCK DIAGRAM

Figure 1

POWER-UP/POWER-DOWN CONDITIONS

On power-up the DS1804 will load the value of EEPROM memory into the wiper position register (or 1

of 100 decoder). The value of this register can then be set to another wiper position if desired, by using

the 3-terminal control port. On power-up, wiper position will be loaded within a maximum time period of

500

µs

once the power-supply is stable. Additionally, the 3-terminal interface port will be active after 50

ms.

On power-down, the wiper position register data will be lost. On the next device power-up, the value of

EEPROM memory will be loaded into the wiper position register.

On shipment from the factory, Dallas Semiconductor does not guarantee a specified EEPROM memory

value. This value should be set by the customer as needed.

NONVOLATILE WIPER STORAGE

Wiper position of the DS1804 can be stored using the

INC

and

inputs. Storage of the wiper position

takes place, whenever the

input transitions from low-to-high while the

INC

is high. Once this

condition has occurred the value of the current wiper position will be written to EEPROM memory.

The DS1804 is specified to accept 50,000 writes to EEPROM before a wear-out condition. After wear-out

the DS1804 will still function and wiper position can be changed during powered conditions using the 3-

terminal control port. However, on power-up the wiper-position will be indeterminate.

ONE TIME PROGRAMMABILITY (OTP)

The DS1804 can be easily used as an OTP device. The user of the DS1804 can trim the desired value of

the wiper position and set this position for storage as described above. Any activity through the 3-

terminal port can then be prevented by connecting the

input pin to V

. Also, an OTP application

does not adversely affect the number of times EEPROM is written, since EEPROM will only be loaded

and

not written

during a power-up or power-down condition.

On power-up the DS1804 will load the current value of EEPROM memory into the wiper position

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