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PDF DS2890X-000 Data sheet ( Hoja de datos )

Número de pieza DS2890X-000
Descripción 1-Wire Digital Potentiometer
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS2890X-000 Hoja de datos, Descripción, Manual

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 kresistor 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 k
T0-92
DS2890P-000
100 k
6-pin TSOC
DS2890X-000
100 k
Flip Chip Pkg., Tape & Reel
DS2890T-000
100 k
Tape & Reel of DS2890
DS2890V-000
100 k
Tape & Reel of DS2890P
* Contact the factory for availability of alternate resistance values
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061500

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DS2890X-000 pdf
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 k
If 01b: 10 k
If 10b: 50 k
If 11b: 100 k
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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DS2890X-000 arduino
Figure 11. 1-WIRE CRC GENERATOR
Polynomial = X8 + X5 + X4 + 1
DS2890
RS
1ST 2ND 3RD 4TH
STAGE STAGE STAGE STAGE
X0 X1 X2 X3
5TH
STAGE
X4
6TH 7TH 8TH
STAGE STAGE STAGE
X5 X6 X7
INPUT DATA
X8
POTENTIOMETER FUNCTION COMMANDS
Once the bus master has completed a ROM command sequence, one of six DS2890 potentiometer
function commands can be issued. The Potentiometer Function Command flow charts, Figure 16 and
Figure 17, describe the protocols necessary for adjusting or reading the potentiometer wiper position or
controlling the operating state of the DS2890. All potentiometer functions consist of a single command
byte followed by one or more bytes of data or control written/read by the bus master. All data transferred
between the DS2890 and the bus master are communicated least significant bit first.
READ POSITION [F0H]
The Read Position command is used to obtain the wiper setting of the potentiometer currently addressed
by the Control Register. Although the DS2890 is a single element potentiometer, wiper addressing still
applies and the Control Register wiper number used for addressing must be set accordingly. In addition
to wiper position, the Control Register byte will be returned with a Read Position command. This enables
the bus master to easily confirm/determine the currently addressed potentiometer wiper. Following the
Read Position command byte, the bus master reads 16 bits to obtain first the Control Register byte then
the wiper position byte. The DS2890 will respond with 0’s to additional reads after the 8 bit of the
position byte. The Read Position command is terminated with a Reset pulse.
WRITE POSITION [0FH]
The Write Position command is used to set the position of the currently addressed potentiometer wiper.
Although the DS2890 is a single element potentiometer, wiper addressing still applies and the Control
Register wiper number used for addressing must be set accordingly. The bus master follows the Write
Position command byte with an 8-bit wiper position value. Following the 8th bit of the position byte, the
bus master reads back the 8-bit position value from the DS2890 to confirm that the value was received
correctly by the device. If an incorrect value is read back, the bus master must issue a Reset pulse and
repeat the sequence. If the value read back is correct, the bus master then sends the 8-bit release code
(96h). If the DS2890 accurately receives the release code, the wiper position is updated and the device
will respond with 0’s to additional reads by the bus master. If an invalid release code is received, no
change is made to the wiper position and the device will respond with 1’s to additional reads by the bus
master. The Write Position command is terminated with a Reset pulse.
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