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PDF CAT5128 Data sheet ( Hoja de datos )
| Número de pieza | CAT5128 | |
| Descripción | 32-Tap Digital Up/Down Control Potentiometer | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT5128 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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32-Tap Digital Up/Down Control Potentiometer
CAT5128
FEATURES
32-position linear taper potentiometer
Low power CMOS technology
Single supply operation: 2.5V – 5.5V
Discrete step-up/step-down digital control
Resistance values: 10kΩ, 50kΩ and 100kΩ
Available in SOT-23 8-lead Pb-free package
APPLICATIONS
Automated product calibration
Remote control adjustments
Offset, gain and zero control
Tamper-proof calibrations
Contrast, brightness and volume controls
Motor controls and feedback systems
Programmable analog functions
For Ordering Information details, see page 7.
DESCRIPTION
The CAT5128 is a single digitally programmable
potentiometer (DPP™) designed as an electronic
replacement for mechanical potentiometers and trim
pots. Ideal for automated adjustments on high volume
production lines, they are also well suited for
applications where equipment requiring periodic
adjustment is either difficult to access or located in a
hazardous or remote environment.
The CAT5128 contains a 32-tap series resistor array
connected between two terminals A and B. An
up/down counter and decoder that are controlled by
two input pins, determines which tap is connected to
the wiper, W. Wiper-control of the CAT5128 is
accomplished with two input control pins, U¯¯P and
¯D¯O¯W¯¯N¯. A high-to-low transition on the U¯¯P input
increments the wiper position and a high-to-low
transition on the ¯D¯O¯W¯¯N¯ input decrements the wiper
position. The tap position is not stored in memory.
The wiper is always set to the mid point, tap 15 at
power up.
The digitally programmable potentiometer can be used
as a three-terminal resistive divider or as a two-terminal
variable resistor. DPPs bring variability and program-
mability to a wide variety of applications including
control, parameter adjustments, and signal processing.
FUNCTIONAL DIAGRAM
VCC
UP
DOWN
UP/DOWN
Control
Power On Recall
GND
A
VCC
W
UP
B DOWN
GND
General
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5-BIT
UP/DOWN
COUNTER
CONTROL
CIRCUITRY
31
30
29
ONE 28
OF
THIRTY TWO
DECODER
2
1
0
Detailed
1
AA
TRANSFER RESISTOR
GATES
ARRAY
W
B
W
B
Electronic Potentiometer
Implementation
Doc. No. MD-2128 Rev. A
1 page  
CAT5128
wAwCw.DCaOtaNShDeIeTt4IOU.NcoSmOF TEST
VCC Range
Input Pulse Levels
Input Rise and Fall Times
Input Reference Levels
2.5V ≤ VCC ≤ 5.5V
0.2VCC to 0.7VCC
10ns
0.5VCC
AC OPERATING CHARACTERISTICS
VCC = +2.5V to +5.5V, VH = VCC, VL = 0V, unless othewise specified
Symbol
tUP
tDOWN
tUP_CYC
tDOWN_CYC
tUP_R, tUP_F(2)
tDOWN_R, tDOWN_F(2)
tUP_SET
tDOWN_SET
tPU(2)
Parameter
U¯¯P LOW Period
¯D¯O¯W¯¯N¯ LOW Period
U¯¯P Cycle Time
¯D¯O¯W¯¯N¯ Cycle Time
U¯¯P Rise and Fall Time
¯D¯O¯W¯¯N¯ Rise and Fall Time
U¯¯P Settling Time
¯D¯O¯W¯¯N¯ Settling Time
Power-up to Wiper Stable
Min
500
500
1
1
–
–
200
200
–
INTERFACE TIMING DIAGRAM
tUP_CYC
tUP
tUP_R
90% 90%
UP
10% 10%
Typ(1)
–
–
–
–
–
–
–
–
–
tUP_F
Max
–
–
–
–
500
500
–
–
1
tUP_SET
RW
MI(3)
DOWN
Increment RW in Discrete Steps
tDOWN_CYC
tDOWN
tDOWN_R
90%
10%
90%
10%
tDOWN_F
Units
ns
ns
µs
µs
ns
ns
ns
ns
ms
tDOWN_SET
RW
MI(3)
Decrement RW in Discrete Steps
Notes:
(1) Typical values are for TA = 25ºC and nominal supply voltage.
(2) This parameter is periodically sampled and not 100% tested.
(3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-2128 Rev. A
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CAT5128.PDF ] | |
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