32-Position Manual Up/Down Control
Potentiometer
AD5228
FUNCTIONAL BLOCK DIAGRAM
FEATURES
32-position digital potentiometer
10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
Simple manual up/down control
Self-contained, requires only 2 pushbutton tactile switches
Built-in adaptive debouncer
Discrete step-up/step-down control
D
AD5228
UP/DOWN
E
CONTROL
LOGIC
V
DD
C
O
D
E
A
R1 R2
W
B
DISCRETE
STEP/AUTO
SCAN DETECT
Autoscan up/down control with 4 steps per second
Pin-selectable zero-scale/midscale preset
Low potentiometer mode tempco, 5 ppm/°C
Low rheostat mode tempco, 35 ppm/°C
Digital control compatible
PUSH-UP
BUTTON
PU
PD
ADAPTIVE
DEBOUNCER
ZERO- OR MID-
SCALE PRESET
PUSH-DOWN
BUTTON
PRE
GND
Ultralow power, IDD = 0.4 µA typ and 3 µA max
Low operating voltage, 2.7 V to 5.5 V
Automotive temperature range, −40°C to +105°C
Compact thin SOT-23-8 (2.9 mm × 3 mm) Pb-free package
Figure 1.
The AD5228 can increment or decrement the resistance in
discrete steps or in autoscan mode. When the or button
PU PD
is pressed briefly (no longer than 0.6 s), the resistance of the
AD5228 changes by one step. When the or button is held
APPLICATIONS
Mechanical potentiometer and trimmer replacements
LCD backlight, contrast, and brightness controls
Digital volume control
Portable device-level adjustments
Electronic front panel-level controls
Programmable power supply
PU PD
continuously for more than a second, the device activates the
autoscan mode and changes four resistance steps per second.
The AD5228 can also be controlled digitally; its up/down
features simplify microcontroller usage. The AD5228 is available
in a compact thin SOT-23-8 (TSOT-8) package. The part is
guaranteed to operate over the automotive temperature range of
−40°C to +105°C.
GENERAL DESCRIPTION
The AD5228 is Analog Devices’ latest 32-step-up/step-down
control digital potentiometer emulating mechanical potenti-
ometer operation1. Its simple up/down control interface allows
manual control with just two external pushbutton tactile
switches. The AD5228 is designed with a built-in adaptive
debouncer that ignores invalid bounces due to contact bounce
commonly found in mechanical switches. The debouncer is
adaptive, accommodating a variety of pushbutton tactile
switches that generally have less than 10 ms of bounce time
during contact closures. When choosing the switch, the user
should consult the timing specification of the switch to ensure
its suitability in an AD5228 application.
The AD5228’s simple interface, small footprint, and very low
cost enable it to replace mechanical potentiometers and
trimmers with typically 3× improved resolution, solid-state
reliability, and faster adjustment, resulting in considerable cost
saving in end users’ systems.
Users who consider EEMEM potentiometers should refer to the
recommendations in the Applications section.
Table 1. Truth Table
PU
PD
Operation1
0
0
1
1
0
1
0
1
RWB Decrement
RWB Increment
RWB Decrement
RWB Does Not Change
1RWA increments if RWB decrements and vice versa.
1 The terms digital potentiometer and RDAC are used interchangeably.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
5秒后页面跳转
三星深化印度制造布局，供应链本地化进程加速
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
纳微科技震撼发布GaNSlim革新氮化镓功率芯片
意法半导体发布第四代SiC技术，助力电动汽车电驱
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
