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PDF ( 数据手册 , 数据表 ) ISL23512

零件编号 ISL23512
描述 Single Push Button Controlled Potentiometer
制造商 Intersil
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ISL23512 数据手册, 描述, 功能
ISL23512NOc1NTo-8nOR8taE8Rc-CDEItNOCaoTtMOuaErMMRSTMESehNIcEeLhDNeonStEDriDicEnwaDFglwOSRlweRuE.ipPPnNpLtuEeoArsWrsCthiCElD.BcMeEonSuEmtIeNtGt/rTtoNsaJncStanCuoanrytr2o1l,le2d00P8otentiometer
(XDCP™)
FN6590.1
Low Noise, Low Power, 16 Taps, Push
Button Controlled Potentiometer
The Intersil ISL23512 is a three-terminal digitally-controlled
potentiometer (XDCP) implemented by a resistor array
composed of 15 resistive elements and a wiper switching
network. The ISL23512 features a push button control, a
shutdown mode, as well as an industry-leading µTQFN
package.
The push button control has individual PU and PD inputs for
adjusting the wiper. To eliminate redundancy, the wiper
position will automatically increment or decrement if one of
these inputs is held longer than 1s.
Forcing both PU and PD low for more than 2s activates
shutdown mode. Shutdown mode disconnects the top of the
resistor chain and moves the wiper to the lowest position,
minimizing power consumption.
The three terminals accessing the resistor chain naturally
configure the ISL23512 as a voltage divider. A rheostat is
easily formed by floating an end terminal or connecting it to
the wiper.
Pinout
ISL23512
(10 LD ΜTQFN)
TOP VIEW
O
PU 1
NC
10
9 VCC
PD 2
8 NC
RH 3
7 RL
VSS 4
6 RW
5
NC
Features
• Solid-state volatile potentiometer
• Push button controlled
• Single or Auto increment/decrement
- Fast Mode after 1s button press
• Shutdown Mode
• 16 wiper tap points
- Zero scale wiper position on power-up
• Low power CMOS
- VCC = 2.7V to 5.5V
- Terminal voltage, 0 to VCC
- Standby current, 3µA max
• RTOTAL value = 10k
• Packages
- 10 Ld µTQFN (2.05mmx1.55mm)
- Pb-free (RoHS compliant)
Applications
• Volume Control
• LED/LCD Brightness Control
• Contrast Control
• Programming Bias Voltages
• Ladder Networks
Ordering Information
PART NUMBER
(Notes 1, 2)
PART MARKING
RTOTAL
(k)
TEMPERATURE
RANGE (°C)
PACKAGE
(Pb-free)
PKG. DWG. #
ISL23512WFRU10Z-TK
GB
10
-40 to +125
10 Ld µTQFN
L10.2.1x1.6A
NOTES:
1. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu
plate - e4 termination finish, which is 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.
2. Please refer to TB347 for details on reel specifications.
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 Americas Inc. Copyright Intersil Americas Inc. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.







ISL23512 pdf, 数据表
ISL23512
Power-up and Power-down Requirements
There are no restrictions on the power-up or power-down
conditions of Vcc and the voltages applied to the
potentiometer pins provided that Vcc is always more positive
than or equal to VRH and VRL, i.e., Vcc VRH,VRL. The Vcc
ramp rate specification is always in effect.
Pin Descriptions
RH and RL
The RH and RL pins of the ISL23512 are equivalent to the
fixed terminals of a mechanical potentiometer. The minimum
voltage is Vss and the maximum is Vcc. The terminology of
RH and RL references the relative position of the terminal in
relation to wiper movement direction.
RW
The RW pin is the wiper terminal of the potentiometer, which
is equivalent to the movable terminal of a mechanical
potentiometer. The default wiper position at power-up is at
0 tap.
PU
The debounced PU input is used to increment the wiper
position. An on-chip pull-up holds the PU input HIGH. A
switch closure to ground or a LOW logic level will, after a
debounce time, move the wiper to the next adjacent higher
tap position.
PD
The debounced PD input is used to decrement the wiper
position. An on-chip pull-up holds the PD input HIGH. A
switch closure to ground or a LOW logic level will, after a
debounce time, move the wiper to the next adjacent lower
tap position.
Device Operation
There are three sections of the ISL23512: the input control,
the 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 15
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 ISL23512 is designed to interface directly to two push
button switches for effectively moving the wiper up or down.
The PU and PD inputs increment or decrement a 4-bit counter
respectively. The output of this counter is decoded to select
one of the sixteen wiper positions along the resistive array.
The wiper increment input, PU and the wiper decrement input,
PD are both connected to an internal pull-up so that they
normally remain HIGH. When pulled LOW by an external
push button switch or a logic LOW level input, the wiper will be
switched to the next adjacent tap position.
Internal debounce circuitry prevents inadvertent switching of
the wiper position if PU or PD remain LOW for less than
15ms, typical. Each of the buttons can be pushed either
once for a single increment/decrement or continuously for
multiple increments/decrements. The number of
increments/decrements of the wiper position depend on how
long the button is being pushed. When making a continuous
push, after the first second, the increment/decrement speed
increases. For the first second, the device will be in the slow
scan mode. Then, if the button is held for longer than 1s, the
device will go into the fast scan mode. As soon as the button
is released, the ISL23512 will return to a stand-by condition.
If both PU and PD buttons are pulled low more than 15ms
from each other, all commands are ignored upon release of
ALL buttons.
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.
Shutdown Mode
The ISL23512 enters into Shutdown Mode if both PU and
PD inputs are kept LOW for 2s. In this mode, the resistors
array is totally disconnected from its RH pin and the wiper is
moved to the position closest to the RL pin, as shown in
Figure 13.
RH
RW
RL
FIGURE 13. DCP CONNECTION IN SHUTDOWN MODE
Note that PU and PD inputs must be pulled LOW within tDB
time window of 15ms (see “Shutdown Mode Timing” on
page 5) otherwise all commands will be ignored until both
inputs are released.
Holding either PU or PD input LOW for more than 15ms will
exit shutdown mode and return wiper to prior shutdown
position. If PU or PD will be held LOW for more than 250ms,
the ISL23512 will start auto-increment or auto-decrement of
wiper position.
RTOTAL with VCC Removed
The end-to-end resistance of the array will fluctuate once
VCC is removed.
8 FN6590.1
January 21, 2008














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