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DS2890V-000 Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS2890V-000
Beschreibung 1-Wire Digital Potentiometer
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 27 Seiten
DS2890V-000 Datasheet, Funktion
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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DS2890V-000 Datasheet, Funktion
Figure 4. POTENTIOMETER CONTROL REGISTER
DS2890
Control Register Bit Encoding
b7 b6
b5
b4
X CPC
X
X
b3 b2
WN
b1 b0
WN
Control Register Bit Definitions*
Description
Bit(s) Definition
WN: wiper number to control
b1..b0
2 bit binary value representing the potentiometer wiper to
control:
If 00b: potentiometer 1 wiper
If 01b: potentiometer 2 wiper
If 10b: potentiometer 3 wiper
If 11b: potentiometer 4 wiper
WN : inverted wiper number to
1’s complement of potentiometer wiper to control:
b3..b2
control
If 11b: potentiometer 1 wiper
If 10b: potentiometer 2 wiper
If 01b: potentiometer 3 wiper
If 00b: potentiometer 4 wiper
CPC: charge pump control
If 0: the charge pump is OFF
b6
If 1: the charge pump is ON
X: don’t care.
These bits are reserved for future use by Dallas
b4,b5,b7 Semiconductor. These bits should be written to a value of
0.
*NOTE:
Control Register power-on defaults: Charge Pump is OFF (CPC=0), Wiper Number to control is wiper #1
(WN=00b, WN =11b).
Valid DS2890 control values are highlighted: value
Thus for the DS2890, valid control register values are:
Control Register Value Description
00001100b
charge pump off, potentiometer #1 wiper selected
01001100b
charge pump on, potentiometer #1 wiper selected
As shown in Figure 17 and discussed in the “POTENTIOMETER FUNCTION COMMANDS” section,
no change in device state will occur if an invalid control register value is sent.
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DS2890V-000 pdf, datenblatt
DS2890
READ CONTROL REGISTER [AAH]
The Read Control Register command is used to obtain both the Control Register and potentiometer
Feature Register. Following the Read Control Register command byte, the bus master reads 16 bits to
obtain first the Feature Register byte and then the Control Register byte. The DS2890 will respond with
0’s to additional reads after the 8 bit of the Control Register byte. The Read Control Register command
is terminated with a Reset pulse.
WRITE CONTROL REGISTER [55H]
The Write Control Register command is used to manipulate DS2890 state bits located in the Control
Register. This command is used to set the potentiometer wiper address and charge pump state. The bus
master follows the Write Control Register command byte with an 8-bit register value. Following the 8th
bit of the register byte, the bus master reads back the 8-bit control value from the DS2890 to confirm that
the device received the correct value (Note that if an invalid register value was received by the DS2890,
the bus master will read all 1’s (FFh) during the read back sequence.). If a value other than FFh is read,
the bus master determines if the DS2890 received the correct value. 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
Control Register 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 Control Register and the device will respond
with 1’s to additional reads by the bus master. The Write Control Register command is terminated with a
Reset pulse.
INCREMENT [C3H]
The Increment command is used for a one step position increase 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
Increment command byte with an 8-bit read to which the DS2890 will respond with the new 8-bit wiper
position set point. No position change is made if the DS2890 wiper is at the maximum position (FFh)
and an Increment command is received. One difference between the Increment/Decrement commands
and other potentiometer functions is that upon completion of either of these commands, 1-Wire command
processing remains at the potentiometer function level. As shown in Figure 16, additional potentiometer
commands may be sent without going through the ROM function flow.
DECREMENT [99H]
The Decrement command is used for a one step position decrease 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 Decrement command byte with an 8-bit read to which the DS2890 will respond with
the new 8-bit wiper position set point. No position change is made if the DS2890 wiper is at the
minimum position (00h) and a Decrement command is received. One difference between the
Increment/Decrement commands and other potentiometer functions is that upon completion of either of
these commands, 1-Wire command processing remains at the potentiometer function level. As shown in
Figure 16, additional potentiometer commands may be sent without going through the ROM function
flow.
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