DATASHEET

ISL23512
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TERSIL
1-888-IN
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.
(XDCP™)
FN6590.1
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
Pinout
ISL23512
(10 LD ΜTQFN)
TOP VIEW
• LED/LCD Brightness Control
NC
• Programming Bias Voltages
O
• Contrast Control
10
PU
1
9 VCC
PD
2
8 NC
RH
3
7 RL
VSS
4
5
• Ladder Networks
6 RW
NC
Ordering Information
PART NUMBER
(Notes 1, 2)
ISL23512WFRU10Z-TK
PART MARKING
RTOTAL
(k)
TEMPERATURE
RANGE (°C)
10
-40 to +125
GB
PACKAGE
(Pb-free)
10 Ld µTQFN
PKG. DWG. #
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
Pin Descriptions
µTQFN
PIN
SYMBOL
1
PU
The PU is a negative-edge triggered input with internal pull-up. Toggling PU will move the wiper close to RH terminal.
2
PD
The PD is a negative-edge triggered input with internal pull-up. Toggling PD will move the wiper close to RL terminal.
3
RH
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 selected by the PU/PD input.
BRIEF DESCRIPTION
4
VSS
Ground
6
RW
The RW pin is the wiper terminal of the potentiometer, which is equivalent to the movable terminal of a mechanical
potentiometer.
7
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 selected by the PU/PD input.
5, 8, 10
NC
No connection.
9
VCC
Supply Voltage.
Block Diagrams
VCC (SUPPLY VOLTAGE)
PU
PD
PU
PD
CONTROL
BLOCK
4-BIT
UP/DOWN
COUNTER
RH
15
14
RH
13
RW
12
ONE
OF
SIXTEEN
DECODER
TRANSFER
GATES
RESISTOR
ARRAY
RW
RL
2
1
VSS (GROUND)
0
RL
GENERAL
2
DETAILED
FN6590.1
January 21, 2008
ISL23512
Absolute Maximum Ratings
Thermal Information
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage at PU and PD Pin with Respect to GND . . -0.3V to VCC+0.3
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
Voltage at any DCP Pin with Respect to GND. . . . . . . . -0.3V to VCC
IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
Latchup . . . . . . . . . . . . . . . . . . . . . . . . . Class II, Level A @ +125°C
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250V
Thermal Resistance (Typical, Notes 3, 4) JA (°C/W)
JC (°C/W)
10 Ld µTQFN . . . . . . . . . . . . . . . . . . . .
150
48.3
Maximum Junction Temperature (Plastic Package). . . . . . . . +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Temperature Range (Extended Industrial). . . . . . . .-40°C to +125°C
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15mW
Wiper Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3.0mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
3. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
4. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Potentiometer Specifications
SYMBOL
RTOTAL
Over recommended operating conditions, unless otherwise specified.
PARAMETER
RH to RL Resistance
TEST CONDITIONS
MIN
(Note 18)
W option
RH to RL Resistance Tolerance
TYP
(Note 5)
10
-20
W option
±80
Wiper Resistance
Wiper current = VCC/RTOTAL
130
VRH, VRL
VRH and VRL Terminal Voltages
VRH and VRL to GND
CH/CL/CW
(Note 17)
Potentiometer Capacitance
ILkgDCP
Leakage on DCP Pins
0
%
ppm/°C
(Note 16)
400

VCC
V
10/10/25
Voltage at pin from GND to VCC
0.1
UNIT
k
+20
End-to-End Temperature Coefficient
RW
MAX
(Note 18)
pF
1
µA
-1
1
LSB
(Note 6)
-0.5
0.5
LSB
(Note 6)
VOLTAGE DIVIDER MODE (0V @ RL; VCC @ RH; measured at RW unloaded)
INL
(Note 10)
Integral Non-linearity
DNL
(Note 9)
Differential Non-linearity
Monotonic over all tap positions
ZSerror
(Note 7)
Zero-scale Error
W option
0
0.3
3
LSB
(Note 6)
FSerror
(Note 8)
Full-scale Error
W option
-3
-0.3
0
LSB
(Note 6)
TCV
(Note 11)
Ratiometric Temperature Coefficient
DCP register set to 8 hex
±4
ppm/°C
RESISTOR MODE (Measurements between RW and RL with RH not connected, or between RW and RH with RL not connected)
RINL
(Note 15)
Integral Non-linearity
DCP register set between 1 hex and F
hex; monotonic over all tap positions
RDNL
(Note 14)
Differential Non-linearity
Roffset
(Note 13)
Offset
3
-1.5
1.5
MI
(Note 12)
W option
-1
1
MI
(Note 12)
W option
0
3
MI
(Note 12)
1
FN6590.1
January 21, 2008
ISL23512
DC Electrical Specifications
SYMBOL
Over recommended operating conditions, unless otherwise specified.
PARAMETER
ICC
VCC Active Current
VCC = 5.5V, perform wiper move
operation
ISB
Stand-by Current
Monotonic over all tap positions
ILkg
PU, PD Input Leakage Current
VIN = VSS to VCC
VIH
PU, PD Input HIGH Voltage
VIL
PU, PD Input LOW Voltage
CIN
(Note 17)
PU, PD Input Capacitance
Rpull_up
(Note 17)
Pull-up Resistor for PU and PD
AC Electrical Specifications
MIN
(Note 18)
TEST CONDITIONS
TYP
MAX
(Note 5) (Note 18)
0.6
-2
UNIT
150
µA
3
µA
+2
µA
VCC x 0.7
V
VCC x 0.1
VCC = 3.3V, TA = +25°C, f = 1MHz
V
10
pF
1
M
Over recommended operating conditions, unless otherwise specified. Limits are established by
characterization.
SYMBOL
PARAMETER
tGAP
Time Between Two Separate Push Button Events
tDB
Debounce Time
MIN
(Note 18)
TYP
(Note 5)
MAX
(Note 18)
2
UNIT
ms
15
30
ms
tS SLOW
Wiper Change on a Slow Mode
100
250
375
ms
tS FAST
Wiper Change on a Fast Mode
25
50
75
ms
tstdn
(Note 17)
tR VCC
Time to Enter Shutdown Mode (Keep PU and PD Low)
VCC Power-up Rate
2
0.2
s
50
V/ms
NOTES:
5. Typical values are for TA = +25°C and 3.3V supply voltage.
6. LSB: [V(RW)15 – V(RW)0]/15. V(RW)15 and V(RW)0 are voltage on RW pin for the DCP register set to F hex and 0 hex respectively. LSB is the
incremental voltage when changing from one tap to an adjacent tap.
7. ZS error = V(RW)0/LSB.
8. FS error = [V(RW)15 – VCC]/LSB.
9. DNL = [V(RW)i – V(RW)i-1]/LSB -1, for i = 1 to 15; i is the DCP register setting.
10. INL = [V(RW)i – i • LSB – V(RW)]/LSB for i = 1 to 15
Max  V  RW  i  – Min  V  RW  i 
10 6
11. TC = ---------------------------------------------------------------------------------------------  --------------------- for i = 5 to 15 decimal, T = -40°C to +125°C. Max( ) is the maximum value of the wiper
V
 Max  V  RW  i  + Min  V  RW  i    2 +165°C voltage and Min ( ) is the minimum value of the wiper voltage over the temperature
range.
12. MI = |RW15 – RW0|/15. MI is a minimum increment. RW15 and RW0 are the measured resistances for the DCP register set to 0F hex and 00
hex respectively.
13. Roffset = RW0/MI, when measuring between RW and RL.
Roffset = RW15/MI, when measuring between RW and RH.
14. RDNL = (RWi – RWi-1)/MI, for i = 1 to 15.
15. RINL = [RWi – (MI • i) – RW0]/MI, for i = 1 to 15.
6
for i = 5 to 15, T = -40°C to +125°C. Max( ) is the maximum value of the resistance and Min ( ) is
 Max  Ri  – Min  Ri  
10
TC R = ----------------------------------------------------------------  --------------------- the minimum value of the resistance over the temperature range.
 Max  Ri  + Min  Ri    2 +165°C
17. Limits should be considered typical and are not production tested.
16.
18. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
4
FN6590.1
January 21, 2008
ISL23512
Slow Mode Timing
tDB
tGAP
PU
MI*
VW
*MI in the AC timing diagram refers to the minimum incremental change in the wiper voltage.
Fast Mode Timing
tDB
PU
tS FAST
tS SLOW
MI*
VW
1s
*MI in the AC timing diagram refers to the minimum incremental change in the wiper voltage.
Shutdown Mode Timing
tDB
2 SECONDS
SHUTDOWN MODE
PU
PD
VW
5
FN6590.1
January 21, 2008
ISL23512
Typical Performance Curves
3.0
160
VCC = 5.5V
+125ºC
2.5
VCC = 5V
120
2.0
+25ºC
100
ICC (µA)
WIPER RESISTANCE ()
140
80
60
1.0
40
-40ºC
0
3
6
VCC = 2.7V
0.5
20
0
1.5
9
12
0
15
-40
-15
10
35
60
85
110
TEMPERATURE (°C)
TAP POSITION (DECIMAL
FIGURE 1. WIPER RESISTANCE vs TAP POSITION
[ I(RW) = VCC/RTOTAL ] FOR 10k (W)
FIGURE 2. STANDBY ICC vs TEMPERATURE
0.05
0.10
VCC = 5.5V
0.03
0.05
INL (LSB)
DNL (LSB)
VCC = 5.5V
0.01
-0.01
0.00
VCC = 2.7V
-0.05
-0.03
VCC = 2.7V
-0.05
0
3
6
9
12
-0.10
0
15
3
TAP POSITION (DECIMAL
FIGURE 3. DNL vs TAP POSITION IN VOLTAGE DIVIDER
MODE FOR 10k (W)
15
0
VCC = 2.7V
0.0025
0.0020
VCC = 5.5V
0.0015
0.0010
0.0005
-40
-15
10
35
60
85
TEMPERATURE (ºC)
FIGURE 5. ZS ERROR vs TEMPERATURE
6
110
FULL SCALE ERROR (LSB)
ZERO SCALE ERROR (LSB)
12
FIGURE 4. INL vs TAP POSITION IN VOLTAGE DIVIDER
MODE FOR 10k (W)
0.0030
0
9
6
TAP POSITION (DECIMAL)
-0.2
-0.4
VCC = 5.5V
-0.6
-0.8
VCC = 2.7V
-1
-40
-15
10
35
60
85
110
TEMPERATURE (ºC)
FIGURE 6. FS ERROR vs TEMPERATURE
FN6590.1
January 21, 2008
ISL23512
Typical Performance Curves
(Continued)
0.2
0.5
VCC = 2.7V
VCC = 2.7V
0.3
RINL (LSB)
RDNL (LSB)
0.1
0.0
VCC = 5.5V
-0.1
-0.2
3
0
0.1
-0.1
VCC = 5.5V
-0.3
6
9
12
-0.5
15
0
3
TAP POSITION (DECIMAL)
9
12
15
TAP POSITION (DECIMAL)
FIGURE 7. DNL vs TAP POSITION IN RHEOSTAT MODE FOR
10k (W)
FIGURE 8. INL vs TAP POSITION IN RHEOSTAT MODE FOR
10k (W)
1.2
30
VCC = 5.5V
25
0.6
TCv (ppm/ºC)
RTOTAL CHANGE (%)
6
VCC = 2.7V
0.0
20
VCC = 2.7V
VCC = 5.5V
15
10
-0.6
5
-1.2
-40
0
-15
10
35
60
TEMPERATURE (ºC)
85
110
5
7
9
11
13
15
TAP POSITION (DECIMAL)
FIGURE 10. TC FOR VOLTAGE DIVIDER MODE IN ppm
FIGURE 9. END TO END RTOTAL % CHANGE vs
TEMPERATURE
300
INPUT SINEWAVE
TCr (ppm/ºC)
250
200
VCC = 2.7V
150
100
VCC = 5.5V
50
0
MIDSCALE
OUTPUT
3dB CUT OFF = 500kHz
5
7
9
11
13
15
TAP POSITION (DECIMAL)
FIGURE 11. TC FOR RHEOSTAT MODE IN ppm
7
FIGURE 12. FREQUENCY RESPONSE (500kHz)
FN6590.1
January 21, 2008
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.
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
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.
RW
RL
FIGURE 13. DCP CONNECTION IN SHUTDOWN MODE
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.
8
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.
FN6590.1
January 21, 2008
ISL23512
Ultra Thin Quad Flat No-Lead Plastic Package (UTQFN)
D
6
INDEX AREA
2X
A
L10.2.1x1.6A
B
N
10 LEAD ULTRA THIN QUAD FLAT NO-LEAD PLASTIC
PACKAGE
MILLIMETERS
E
SYMBOL
0.10 C
1
2X
2
0.10 C
0.10 C
C
A
A1
SIDE VIEW
(DATUM A)
PIN #1 ID
1
4xk
2
NX L
0.50
0.55
-
-
-
0.05
-
0.127 REF
-
b
0.15
0.20
0.25
5
D
2.05
2.10
2.15
-
E
1.55
1.60
1.65
-
0.50 BSC
-
k
0.20
-
-
L
0.35
0.40
0.45
NX b
e
2
Nd
4
3
Ne
1
3
0
-
12
CL
(A1)
L
5
e
SECTION "C-C"
TERMINAL TIP
C C
4
NOTES:
5
BOTTOM VIEW
NX (b)
-
10
Rev. 3 6/06
0.10 M C A B
0.05 M C
3
(ND-1) X e
-
N
(DATUM B)
N-1
NOTES
0.45

N
MAX
A
e
SEATING PLANE
NOMINAL
A1
A3
TOP VIEW
0.05 C
MIN
FOR ODD TERMINAL/SIDE
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
3. Nd and Ne refer to the number of terminals on D and E side,
respectively.
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Maximum package warpage is 0.05mm.
8. Maximum allowable burrs is 0.076mm in all directions.
9. Same as JEDEC MO-255UABD except:
No lead-pull-back, "A" MIN dimension = 0.45 not 0.50mm
"L" MAX dimension = 0.45 not 0.42mm.
10. For additional information, to assist with the PCB Land Pattern
Design effort, see Intersil Technical Brief TB389.
b
2.50
1.75
0.05 MIN
L
2.00
0.80
0.275
0.10 MIN
DETAIL “A” PIN 1 ID
0.25
0.50
LAND PATTERN 10
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
9
FN6590.1
January 21, 2008
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