DS1804-050 Datasheet DS1804-050, DS1804Z-100, DS1804Z-010 | P1-P3

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FEATURES

 Single 100-Position Taper Potentiometer

 Nonvolatile (NV) On-Demand Wiper

Storage

 Operates from 3V or 5V Supplies

 Up/Down, Increment-Controlled Interface

 Available in 8-Pin (300 mils) DIP, 8-Pin

(150 mils) SO, and 8-Pin (118 mils) µSOP

 -40°C to +85°C Operating Temperature

Range

 Standard Resistance Values:

– DS1804-010: 10kΩ

– DS1804-050: 50kΩ

– DS1804-100: 100kΩ

PIN ASSIGNMENT

PIN DESCRIPTION

H - High-Terminal of Potentiometer

L - Low-Terminal of Potentiometer

W - Wiper of Potentiometer

- 3V or 5V Power Supply

- Chip Select

- Up/Down Control

INC

- Increment/Decrement Wiper Control

GND - Ground

DESCRIPTION

The DS1804 NV trimmer potentiometer is a nonvolatile digital potentiometer that has 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 three-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 10kΩ, 50kΩ, and 100kΩ. 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 mils) DIP, 8-pin (150 mils) SO, and 8-pin (118 mils) μSOP.

DS1804

Nonvolatile Trimmer Potentiometer

19-5876; Rev 6/11

INC 1 8 V

U/D 2 7 CS

H 3 6 L

GND 4 5 W

DIP (300 mils)

SO (150 mils)

μSOP (118 mils)

DS1804

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OPERATION

The DS1804 is a single nonvolatile potentiometer. The device has a total of 100 tap-points including the

L- and H- terminals. A total of 99 resistive segments exist between the L- and H- terminals. These tap-

points are accessible to the W-terminal, whose position is controlled via a three-terminal control port. A

block diagram of the DS1804 is shown in Figure 1.

The three-terminal port of the DS1804 provides an increment/decrement interface which is activated via a

chip-select input. This interface consists of the input signals

INC

, and U/

. These input signals

control a 7-bit up/down counter. The output of the 7-bit up/down counter controls a 1 of 100 decoder to

select wiper position. Additionally, this interface provides for a wiper storage operation using the

and

INC

input control pins. The timing diagram for the three-terminal interface control is shown in Figure 2.

PIN DESCRIPTIONS

- Power Supply. The DS1804 will support supply voltages ranging from +2.7V to +5.5V.

GND - Ground.

H - High-Terminal Potentiometer. This is the high terminal of the potentiometer. It is not required that

this terminal be connected to a potential greater than the L-terminal. Voltage applied to the H-terminal

cannot exceed the power-supply voltage, V

, or go below ground.

L - Low-Terminal Potentiometer. This is the low terminal of the potentiometer. It is not required that this

terminal be connected to a potential less than the H-terminal. Voltage applied to the L-terminal cannot

exceed the power-supply voltage, V

, or go below ground.

W - Wiper of the Potentiometer. This pin is the wiper of the potentiometer. Its position on the resistor

array is controlled by the three-terminal control port. Voltage applied to the wiper cannot exceed the

power-supply voltage, V

, or go below ground.

- Chip Select. The

input is used to activate the control port of the DS1804. This input is active

low. When in a high-state, activity on the

INC

and U/

port pins will not affect or change wiper

position.

INC

- Wiper Movement Control. This input provides for wiper position changes when the

pin is low.

Wiper position changes of the W-terminal will occur one position per high-to-low transition of this input

signal. Position changes will not occur if the

pin is in a high state.

- Up/Down Control. This input sets the direction of wiper movement. When in a high state and

is low, any high-to-low transition on

INC

will cause a one position movement of the wiper towards the

H-terminal. When in a low state and

is low, any high-to-low transitions on

INC

will cause the

position of the wiper to move towards the L-terminal.

DS1804

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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 three-terminal control port. On power-up, wiper position will be loaded within a maximum time

period of 500µs once the power-supply is stable. Additionally, the three-terminal interface port will be

active after 50ms.

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, Maxim Integrated Products 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 over 0°C to 70ºC before a wear-out

condition. After wear-out the DS1804 will still function and wiper position can be changed during

powered conditions using the three-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 three-

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

P1-P3 P4-P6 P7-P9 P10-P10

DS1804-050

Mfr. #:

Buy DS1804-050

Manufacturer:

Maxim Integrated

Description:

Digital Potentiometer ICs

Lifecycle:

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DS1804-050

DS1804-050

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