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ISL23710 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer ISL23710
Beschreibung Taps Up/Down Interface
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 8 Seiten
ISL23710 Datasheet, Funktion
www.DataSheet4U.com
ISL23710
®
Volatile Digitally Controlled Potentiometer (XDCP™)
Data Sheet
August 22, 2005
FN6126.0
Terminal Voltage ±3V or ±5V, 128 Taps
Up/Down Interface
The Intersil ISL23710 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, and a control section. The wiper position is
controlled by a Up/Down interface.
The potentiometer is implemented by a resistor array
composed of 127 resistive elements and a wiper switching
network. Between each element and at either end are tap
points accessible to the wiper terminal. The position of the
wiper element is controlled by the CS, U/D, and INC inputs.
The wiper register is volatile and is reset to midscale on
power up. The wiper position can be locked while powered
up to prevent inadvertent changes.
The device can be used as a three-terminal potentiometer or
as a two-terminal variable resistor in a wide variety of
applications including:
• Industrial and Automotive Control
• Parameter and Bias Adjustments
• Amplifier Bias and Control
Ordering Information
TEMP
PART NUMBER RESISTANCE RANGE
(BRAND)
OPTION () (°C)
PKG.
PACKAGE DWG. #
ISL23710WIU10Z
10K -40 to +85 10 Ld MSOP M10.118
(AOG) (Notes 1, 2)
(Pb-Free)
ISL23710UIU10Z
(AOF) (Notes 1, 2)
50K -40 to +85 10 Ld MSOP M10.118
(Pb-Free)
NOTES:
1. Add “-T” suffix for tape and reel.
2. Intersil Pb-free plus anneal products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• Up/Down Interface with Chip Select Enable
• DCP Terminal Voltage from ±2.7V to ±5V
• 127 Resistive Elements
- Typical RTOTAL tempco ±50ppm/°C
- Ratiometric tempco ±4ppm/°C
- End to end resistance range ±20%
- Wiper resistance = 70typ at VCC = 3.3V
• Low Power CMOS
- V- = -2.7V to -5.5V
- VCC = 2.7V to 5.5V
- Active current, 1mA max
- Standby current, 500nA max
• RTOTAL Values = 10kΩ, 50k
• Volatile Wiper Storage with Wiper Locking
• Packages
- 10 Ld MSOP
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL23710
(10 LD MSOP)
TOP VIEW
U/D
V-
GND
CS
NC
1
2
3
4
5
10 INC
9 VCC
8 RL
7 RW
6 RH
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil, Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.






ISL23710 Datasheet, Funktion
AC Timing
ISL23710
CS
tCI
INC
U/D
tIW
RW
tCYC
tIL
tIH
tID
tICL
tDI
(3)
MI
90% 90%
10%
tF tR
Power Up and Down Requirements
In order to prevent unwanted tap position changes, bring the
CS and INC high before or concurrently with the VCC pin on
power-up. The potentiometer voltages must be applied after
this sequence is completed. During power-up, the data sheet
parameters for the DCP do not fully apply until 1ms after
VCC reaches its final value. The wiper will be set to its initial
value (64d) once VCC exceeds VPOR.
Pin Descriptions
RH and RL
The high (RH) and low (RL) terminals of the ISL23710 are
equivalent to the fixed terminals of a mechanical
potentiometer. The terminology of RL and RH references the
relative position of the terminal in relation to wiper movement
direction selected by the U/D input and not the voltage
potential on the terminal.
RW
Rw is the wiper terminal and is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the control inputs.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incriminated or decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling INC will
move the wiper and either increment or decrement the
counter in the direction indicated by the logic level on the
U/D input.
6
Chip Select (CS)
The device is selected when the CS input is LOW.
Principles of Operation
There are three sections of the ISL23710: the input control,
counter and decode section, and the resistor array. The input
control section operates just like an up/down counter. The
output of this counter is decoded to turn on a single
electronic switch connecting a point on the resistor array to
the wiper output. The resistor array is comprised of 127
individual resistors connected in series. At either end of the
array and between each resistor is an electronic switch that
transfers the potential at that point to the wiper.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. That is, the counter does not wrap around when
clocked to either extreme.
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions. If
the wiper is moved several positions, multiple taps are
connected to the wiper for tIW (INC to VW change). The
RTOTAL value for the device can temporarily be reduced by
a significant amount if the wiper is moved several positions.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the
wiper along the resistor array. With CS set LOW the device
is selected and enabled to respond to the U/D and INC
inputs. HIGH to LOW transitions on INC will increment or
decrement (depending on the state of the U/D input) a seven
bit counter. The output of this counter is decoded to select
FN6126.0
August 22, 2005

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