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STMPE2401 датащи(PDF) 47 Page - STMicroelectronics

номер детали STMPE2401
подробное описание детали  24-bit Enhanced port expander with Keypad and PWM controller Xpander logic
PDF  55 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE2401 датащи(HTML) 47 Page - STMicroelectronics

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STMPE2401
Rotator controller
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14
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 10. 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.
Figure 11. Possible conditions
Table 46. 3 possible conditions: A-B short, B-C short, C-A short.
LO
Input
Current State
Next State
Result
State
Output
Input
Input
State
Output
Input
Input
C1
A
B
C
2
B
A
C
Up
B1
A
B
C
3
C
A
B
Down
A2
B
A
C
3
C
A
B
Down
C2
B
A
C
1
A
B
C
Up
A3
C
A
B
2
B
A
C
Up
B3
C
A
B
1
A
B
C
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