STMPE2403TBR STMicroelectronics, STMPE2403TBR Datasheet - Page 56

• Manufacturer Part Number: STMPE2403TBR
• Description: IC I/O EXPANDER I2C 24B 36TFBGA
• Manufacturer: STMicroelectronics

Specifications of STMPE2403TBR

• Interface: I²C
• Number Of I /o: 24
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-TFBGA
• Includes: Keypad, POR, PWM
• For Use With: 497-8206 - BOARD DEMO EXPANDER STMPE2403
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Rotator controller
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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.
Table 56. Possible conditions
Figure 12. Rotator direction detection
Input
LO
C
B
A
C
A
B
State
1
1
2
2
3
3
Output
R o t a t o r C o n t r o l l e r
Current State
A
A
B
B
C
C
Input
B
B
A
A
A
A
Input
C
C
C
C
B
B
State
2
3
3
1
2
1
Output
B
C
C
B
A
B
A
Next State
Input
A
A
A
A
B
A
B
C
Input
C
B
B
C
C
C
STMPE2403
Result
Down
Down
Down
Up
Up
Up