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DS2890-000-DS2890P-000
1-Wire Digital Potentiometer
FEATURESSingle element 256-position linear taper
potentiometerSupports potentiometer terminal working
voltages up to 11VPotentiometer terminal voltage independent
of supply voltagePotentiometer wiper position controlled and
read over minimal 1-Wire bus interface100 kΩ resistor element valueProvides 1-Wire and VDD power modesSupports Conditional Search based on
power-on default wiper positionMultiple DS2890’s can be identified on acommon 1-Wire bus and operated
independentlyUnique factory lasered 64-bit registration
number assures error free device selection
and absolute part identityBuilt-in multi-drop controller ensures
compatibility with other 1-Wire Network
productsSupports Overdrive mode which boosts
communication speed up to 142 kbits persecond-40oC to +85oC operating temperature range2.8V – 6.0V operating voltage range
PIN ASSIGNMENT
Top View6-pin TSOC1-WIRE
GND
VDDRH
WIPER
TO-92 PackageGND
WIR3
Bottom View
Flip Chip Packageside view
Visit www.dalsemi.com for Flip Chip pinout andmechanical data.
ORDERING INFORMATION
PART NUMBERRESISTANCE*PACKAGE DESCRIPTIONDS2890-000100 kΩT0-92
DS2890P-000100 kΩ6-pin TSOC
DS2890X-000100 kΩFlip Chip Pkg., Tape & Reel
DS2890T-000100 kΩTape & Reel of DS2890
DS2890V-000100 kΩTape & Reel of DS2890P
* Contact the factory for availability of alternate resistance values
DS2890
1-Wire®
DS2890
PIN DESCRIPTION
DESCRIPTIONThe 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 potentiometerterminals, 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 operatedindependently 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 hasgone through a power-on reset and needs to be re-configured with a required wiper position setting. The
DS2890 supports two power modes: 1-Wire only mode in which device power is supplied parasitically
from the 1-Wire bus or VDD mode where power is supplied from an external supply; when operating from
VDD mode wiper resistance is reduced.
DS2890
OPERATIONThe DS2890 is a single element digital potentiometer; a block diagram of the device is shown in Figure 1.
The device has a total of 256 linearly spaced tap points including the RL and RH terminals; a total of 255
resistive segments exist between the RL and RH terminals. These tap points are accessible to the WIPER
terminal whose position is controlled via the 1-Wire bus interface. Wiper position and device state are
maintained as long as the 1-Wire bus is active or the VDD supply is applied within operating limits.Otherwise, a power-on reset will occur and the wiper position and operating state will return to power-on
default conditions.
Figure 1. DS2890 BLOCK DIAGRAM
As shown in the figure the device has five major elements: the 1-Wire Function Controller, the
Potentiometer Controller, the 64-bit ROM, the resistor array, and Parasite Power circuitry. Each of these
elements is discussed in detail throughout the remainder of the data sheet. DS2890 control including
device selection, positioning/reading the potentiometer wiper, and device operating state is performed
over the 1-Wire bus. The hierarchical structure of the 1-Wire protocol as applicable to the DS2890 isshown in Figure 2. As shown, the control sequence starts with the 1-Wire bus master issuing one of eight
ROM function commands. After a ROM function command is successfully completed potentiometer
functions may be executed. The protocol for ROM and potentiometer functions are described in the
“COMMAND FLOW” section. For the 3-pin TO-92 package configuration and operation see the
“TO-92 PACKAGE OPERATION” section.
DS2890
Figure 2. 1-WIRE COMMAND HIERARCHICAL STRUCTURE
DATA I/O BIT ORDERAll data is read and written least significant bit (LSB) first.
POTENTIOMETER FEATURE REGISTERAlthough the feature set of the DS2890 is primarily fixed, a mechanism to identify feature characteristics
of future 1-Wire potentiometers has been developed and implemented in the DS2890. As shown in
Figure 3, the feature register is an encoded read-only byte that describes the characteristics of the DS2890and future 1-Wire potentiometers. Feature values that correspond to the DS2890 are highlighted. The
feature register is read with the READ CONTROL REGISTER potentiometer function command (see
“POTENTIOMETER FUNCTION COMMANDS”).
DS2890
Figure 3. 1-WIRE POTENTIOMETER FEATURE REGISTER
Feature Register Bit Encoding
Feature Register Bit Definitions2 bit binary value representing number of wiper positions
for each potentiometer:
If 00b:32 positions
If 00b:5 kΩ
DS2890 feature values are highlighted:
The DS2890 will respond with a feature register value of F3h when a READ CONTROL
REGISTER command is executed, see section “POTENTIOMETER FUNCTION COMMANDS”.
POTENTIOMETER CONTROL REGISTERThe potentiometer control register is used to turn on/off the DS2890 charge pump (see section
“POTENTIOMETER WIPER RESISTANCE AND CHARGE PUMP CONSIDERATIONS” for a
