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STMPE821 Datasheet(PDF) 42 Page - STMicroelectronics

Part # STMPE821
Description  8-bit Xpander Logic??with touchkey controller
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE821 Datasheet(HTML) 42 Page - STMicroelectronics

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Basic PWM controller
STMPE821
42/55
“On” period = period 0[1:0] * time unit [3:0]
“Off” period = period 1[1:0] * time unit [3:0]
Duty cycle during “on” period = brightness [7:4]
Number of cycles = repetition [3:0]
Ramp up rate is programmable.
Figure 12.
Fixed brightness output
“On” period = period 0[1:0] * time unit [3:0]
Off period = don't care
Duty cycle during “on” period = brightness [7:4]
Number of cycles = repetition [3:0] = 0 (means infinite repetition)
Duty cycle
Time
time unit
CS00056



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