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STMPE2403 датащи(PDF) 56 Page - STMicroelectronics

номер детали STMPE2403
подробное описание детали  24-bit Enhanced port expander with Keypad and PWM controller Xpander logic
PDF  63 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE2403 датащи(HTML) 56 Page - STMicroelectronics

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Rotator controller
STMPE2403
56/63
13
Rotator controller
Rotator controller consists of 3 terminal, each capable of becoming an input with internal
pull-up, or and output. At any moment, 2 terminals are inputs and one terminal is output.
Figure 11. Rotator controller
The Rotator Controller is responsible for the detection of the direction of rotator and the
reporting of these direction sequences. The direction of a rotator can be either up or down.
A rotator has 3 contacts and detection of shorts on these contacts is used to determine the
direction of rotation. Following diagram shows the definition of the direction of rotation and
how the FSM states and driven outputs correspond to rotation.
3 possible conditions: A-B short, B-C short, C-A short.
Figure 12. Rotator direction detection
Table 56. Possible conditions
LO
Input
Current State
Next State
Result
State
Output
Input
Input
State
Output
Input
Input
C
1
AB
C
2
BA
C
Up
B1
A
B
C
3
C
A
B
Down
A2
B
A
C
3
C
A
B
Down
C
2
BA
C
1
AB
C
Up
A3
C
A
B
2
B
A
C
Up
B3
C
A
B
1
A
B
C
Down
R
o
ta
to
rC
o
n
tro
lle
r
A
B
C



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