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Status
Part Number	Status	Replacement	Explanation
DS2890	This product is No Longer Available. See Ordering Information for recommended replacements.	DS1805	The DS2890 is no longer available. Both the DS1805 and MAX5401 provide similar potentiometer functionality without the 1-Wire interface.

Data Sheet

FULL DATA SHEET (PDF, 976kB) Download   E-Mail

Description

The DS2890 is a linear taper digitally controlled potentiometer with 256 wiper positions. Device operation, including wiper position, is controlled over the single contact 1-Wire bus for the ultimate in electrical interface simplicity. With a wide 0–11 volt working voltage range for the potentiometer terminals, the DS2890 is ideal for a broad range of industrial and control applications. Potentiometer terminal voltage is independent of device supply voltage as well as the voltage applied to the other potentiometer terminals. Communication with the DS2890 follows the standard Dallas Semiconductor 1-Wire protocol and can be accomplished with minimal hardware such as a single port pin of a microcontroller. Multiple DS2890 devices can reside on a common 1-Wire bus and be operated independently of each other. Each DS2890 has its own unalterable 64-bit ROM registration number that is factory lasered into the chip. The registration number guarantees unique identification for absolute traceability and is used to address the device in a multi-drop 1-Wire Network environment. The DS2890 will respond to a 1-Wire Conditional Search command if the potentiometer wiper is set at the power-on default position. This feature enables the bus master to easily determine whether a potentiometer has gone through a power-on reset and needs to be re-configured with a required wiper position setting. The DS2890 supports two power modes: a) 1-Wire only mode in which device power is supplied parasitically from the 1-Wire and b) VDD mode where power is supplied from an external supply With a VDD supply the device can support both a potentiometer and variable resistor configuration. When operating in a 1-Wire only power mode the device supports only a variable resistor configuration.

Key Features

Single element 256-position linear taper potentiometer Supports potentiometer terminal working voltages up to 11V Potentiometer terminal voltage independent of supply voltage Potentiometer wiper position controlled and read over minimal 1-Wire bus interface 100 kΩ resistor element value T0-92 package provides a 1-Wire® variable resistor configuration Supports Conditional Search based on power-on default wiper position Multiple DS2890's can be identified on a common 1-Wire bus and operated independently Unique factory lasered 64-bit registration number assures error free device selection and absolute part identity Built-in multi-drop controller ensures compatibility with other 1-Wire Network products Supports Overdrive mode which boosts communication speed up to 142 kbits per second -40°C to +85°C operating temperature range 2.8V – 6.0V operating voltage range

Application Notes

Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS2890 Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2890

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS2890.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

DS2890	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2890-000		N/A	No Longer Available	DS1805	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2890-000+		N/A	No Longer Available	DS1805	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2890-000+T&R		N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS2890T-000		N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS2890P-000		N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS2890V-000		N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet

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