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PDF X93155 Data sheet ( Hoja de datos )
| Número de pieza | X93155 | |
| Descripción | Digitally Controlled Potentiometer | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de X93155 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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February 19, 2008
X93155
FN8181.2
Digitally Controlled Potentiometer
(XDCP™)
The Intersil X93155 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, a control section, and nonvolatile memory. The
wiper position is controlled by a 3-wire interface.
The potentiometer is implemented by a resistor array
composed of 31 resistive elements and a wiper switching
network. The position of the wiper element is controlled by
the CS, U/D, and INC inputs. The position of the wiper can
be stored in nonvolatile memory and then be recalled upon
during a subsequent power-up operation.
The device is connected as a two-terminal variable resistor
and can be used in a wide variety of applications including:
- Bias and Gain Control
- LCD Contrast Adjustment
Pinout
X93155
(8 LD MSOP)
TOP VIEW
INC 1
U/D 2
RH 3
VSS
4
8 VCC
7 CS
6 RL
5 NC*
Features
• Solid-state potentiometer
• Up/Down interface
• 32 wiper tap points per potentiometer
- Wiper position stored in nonvolatile memory and
recalled on power-up
• 31 resistive elements per potentiometer
- Temperature compensated
- Maximum resistance tolerance ±25%
- Terminal voltage, 0 to VCC
• Low power CMOS
- VCC = 5V ±10%
- Active current, 200µA typ.
- Standby current, 2.0µA max
• High reliability
- Endurance 200,000 data changes per bit
- Register data retention, 100 years
• RTOTAL value = 50k
• Packages
- 8 Ld MSOP
• Pb-free available (RoHS compliant)
*NC can be left unconnected, or connected to any voltage between VSS
and VCC.
Ordering Information
PART NUMBER
X93155UM8I*
PART MARKING VCC LIMITS (V) RTOTAL (k)
AGM
5 ±10%
50
TEMP
RANGE (°C)
-40 to +85
PACKAGE
8 Ld MSOP
PKG DWG. #
M8.118
X93155UM8IZ* (Note)
DCH
-40 to +85
8 Ld MSOP
(Pb-free)
M8.118
*Add "T1" suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100%
matte tin plate PLUS ANNEAL - e3 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
AC Timing
CS
tCI
INC
U/D
X93155
tCYC
tIL
tIH
tIC
tID tDI
(STORE)
tCPH
90% 90%
10%
tF tR
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 VH and VL, i.e., VCC VH,VL. The
VCC ramp rate specification is always in effect.
Pin Descriptions
RH and RL
The RH and RL pins of the X93155 are equivalent to the end
terminals of a variable resistor. 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 U/D input.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented 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.
Chip Select (CS)
The device is selected when the CS input is LOW. The
current counter value is stored in nonvolatile memory when
CS is returned HIGH while the INC input is also HIGH. After
the store operation is complete, the X93155 will be placed in
the low power standby mode until the device is selected
once again.
Principles of Operation
There are three sections of the X93155: the input control,
counter and decode section; the nonvolatile memory; 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
5
resistor array to the wiper output. Under the proper
conditions the contents of the counter can be stored in
nonvolatile memory and retained for future use. The resistor
array is comprised of 31 individual resistors connected in
series. At either end of the array and between each resistor
is an electronic switch that transfers the connection at that
point to the wiper. The wiper is connected to the RL terminal,
forming a variable resistor from RH to RL.
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.
If the wiper is moved several positions, multiple taps are
connected to the wiper for up to 10µs. The 2-terminal
resistance value for the device can temporarily change by a
significant amount if the wiper is moved several positions.
When the device is powered-down, the last wiper position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled
and the wiper is set to the value last stored.
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 five
bit counter. The output of this counter is decoded to select
one of thirty two wiper positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH. In order to avoid an accidental store during power-up,
CS must go HIGH with VCC during initial power-up. When
left open, the CS pin is internally pulled up to VCC by an
internal 30k resistor.
The system may select the X93155, move the wiper and
deselect the device without having to store the latest wiper
FN8181.2
February 19, 2008
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet X93155.PDF ] | |
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