參數(shù)資料
型號(hào)： AD5228BUJZ1002-RL7
廠商： Analog Devices, Inc.
元件分類： 通用總線功能
英文描述： Memory Card Socket; Number of Contacts:50; Pitch Spacing:0.635mm; Contact Termination:PCB SMT; Contact Material:Copper Alloy; Contact Plating:Gold Over Nickel; Gender:Male; Number of Rows:2
中文描述： 32工位手冊(cè)上/下控制電位器
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 341K
代理商： AD5228BUJZ1002-RL7
AD5228
THEORY OF OPERATION
The AD5228 is a 32-position manual up/down digitally con-
trolled potentiometer with selectable power-on preset. The
AD5228 presets to midscale when the PRE pin is tied to ground
and to zero-scale when PRE is tied to V
DD
. Floating the PRE pin
is not allowed. The step-up and step-down operations require
the activation of the PU (push-up) and PD (push-down) pins.
These pins have 100 k internal pull-up resistors that the PU
and PD activate at logic low. The common practice is to apply
external pushbuttons (tactile switches) as shown in Figure 30.
Rev. 0 | Page 11 of 20
0
UP/DOWN
CONTROL
LOGIC
DISCRETE
STEP/AUTO
SCAN DETECT
ADAPTIVE
DEBOUNCER
ZERO- OR MID-
SCALE PRESET
AD5228
PUSH-UP
BUTTON
PUSH-DOWN
BUTTON
R1
R2
D
E
C
O
D
E
A
W
B
V
DD
PRE
GND
PU
PD
Figure 30. Typical Pushbutton Interface
Because of the bounce mechanism commonly found in the
switches during contact closures, a single pushbutton press
usually generates numerous bounces during contact closure.
Note that the term
pushbutton
refers specifically to a
pushbutton tactile switch or a similar switch that has 10 ms or
less bounce time during contact closure. Figure 31 shows the
characteristics of one such switch, the KRS-3550 tactile switch.
Figure 32 and Figure 33 show close ups of the initial bounces
and end bounces, respectively.
0
CH1
1.00V
M40.0ms
T
20.40%
A CH1 2.38V
1
Figure 31. Typical Tactile Switch Characteristics
0
CH1
1.00V
M100
μ
s
T
20.20%
A CH1 2.38V
1
Figure 32. Close-Up of Initial Bounces
0
CH1
1.00V
M10.0
μ
s
T
20.20%
A CH1 2.38V
1
Figure 33. Close-Up of Final Bounces
The following paragraphs describes the PU incrementing
operation. Similar characteristics apply to the PD decrementing
operation.
The AD5228 features an adaptive debouncer that monitors the
duration of the logic-low level of PU signal between bounces. If
the PU logic-low level signal duration is shorter than 7 ms, the
debouncer ignores it as an invalid incrementing command.
Whenever the logic-low level of PU signal lasts longer than
11 ms, the debouncer assumes that the last bounce is met and
therefore increments R
WB
by one step.
Repeatedly pressing the PU button for fast adjustment without
missing steps is allowed, provided that each press is not shorter
than t
PU
, which is 12 ms (see Figure 2). As a point of reference,
an advanced video game player can press a pushbutton switch
in 40 ms.
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