DS2890T Datasheet PDF - Dallas Semiconducotr
| Part Number | DS2890T | |
| Description | 1-Wire Digital Potentiometer | |
| Manufacturers | Dallas Semiconducotr | |
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PRELIMINARY
DS2890
1-Wire® Digital Potentiometer
www.dalsemi.com
FEATURES
PIN ASSIGNMENT
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
Provides 1-Wire and VDD power modes
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
-40oC to +85oC operating temperature range
2.8V – 6.0V operating voltage range
Top View
6-pin TSOC
GND
1-WIRE
VDD
1
2
3
6 RL
5 WIPER
4 RH
TO-92 Package
1 23
1 2 3 Bottom View
Flip Chip Package
top view
side view
Visit www.dalsemi.com for Flip Chip pinout and
mechanical data.
ORDERING INFORMATION
PART NUMBER
RESISTANCE* PACKAGE DESCRIPTION
DS2890-000
100 kΩ
T0-92
DS2890P-000
100 kΩ
6-pin TSOC
DS2890X-000
100 kΩ
Flip Chip Pkg., Tape & Reel
DS2890T-000
100 kΩ
Tape & Reel of DS2890
DS2890V-000
100 kΩ
Tape & Reel of DS2890P
* Contact the factory for availability of alternate resistance values
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061500
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Figure 3. 1-WIRE POTENTIOMETER FEATURE REGISTER
DS2890
Feature Register Bit Encoding
b7 b6
b5
b4
PR NWP
b3 b2
NP
b1
WSV
b0
PC
Feature Register Bit Definitions
Feature Description
Bit(s) Definition
PC: potentiometer characteristic
If 0: logarithmic potentiometer element(s)
b0
If 1: linear potentiometer element(s)
WSV: wiper setting volatility
If 0: wiper setting(s) are non-volatile
b1
If 1: wiper setting(s) are volatile
NP: number of potentiometers
b3..b2 2 bit binary value representing number of potentiometers:
If 00b: 1 potentiometer
If 01b: 2 potentiometers
If 10b: 3 potentiometers
If 11b: 4 potentiometers
NWP: number of wiper positions
b5..b4
2 bit binary value representing number of wiper positions
for each potentiometer:
If 00b: 32 positions
If 01b: 64 positions
If 10b: 128 positions
If 11b: 256 positions
PR: potentiometer resistance
b7..b6 2 bit binary value representing potentiometer resistance:
If 00b: 5 kΩ
If 01b: 10 kΩ
If 10b: 50 kΩ
If 11b: 100 kΩ
DS2890 feature values are highlighted: value
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 REGISTER
The potentiometer control register is used to turn on/off the DS2890 charge pump (see section
“POTENTIOMETER WIPER RESISTANCE AND CHARGE PUMP CONSIDERATIONS” for a
discussion of the charge pump) and has control capabilities for future 1-Wire potentiometers that could
contain multiple resistor elements. The format of the control register is shown in Figure 4.
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| Information | Total 27 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS2890T.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
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| DS2890P | The function is 1-Wire Digital Potentiometer. Dallas Semiconducotr | |
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