STMPE2403 Datasheet, PDF (40/63 Pages) STMicroelectronics – 24-bit Enhanced port expander with Keypad and PWM controller Xpander logic

PWM controller
11 PWM controller
STMPE2403
The STMPE2403 PWM controller provides 3 independent PWM outputs used to generate
light effect; if the PWM outputs are not used, these pins can be used as GPIO.
Figure 7. PWM controller
Divide by “Step Time”
(Up/Down by “Step
Sign”)
64Hz-2KHz
Prescaler
(Divide by 16 or 512)
1Hz-2KHz
Increment
Counter
32KHz
Primary Clock
Instruction
Processor
PWM Ref
Counts from 0-255
repeatedly
Comparator
Instruction Word 0
Instruction Word 1
Instruction Word 2
Instruction Word 63
PWM Count
Count from 0-255
based on instructions
Trigger Bus
INT
PWM Output
Instructions are downloaded into the memory via the I2C connection.
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