STMPE821_09 STMICROELECTRONICS [STMicroelectronics], STMPE821_09 Datasheet - Page 40

• Manufacturer Part Number: STMPE821_09
• Description: 8-channel capacitive touch key controller
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Basic PWM controller
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Basic PWM controller
The advanced PWM allows complex brightness and blinking control of a LED. The basic
PWM controller allows simpler brightness control and basic blinking patterns. The
STMPE821 is fitted with a 4-channel basic PWM controller.
The PWM controllers outputs are connected to the GPIO 0-3. In order to activate the PWM
channels, the alternate function bits in the master enable register must be set to '1'. The
PWM controllers are capable of generating the following brightness patterns:
Figure 8.
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 mode is disabled
cycle
Duty
Pulses with programmable brightness, ON/OFF period and repetition
period
On
period
Off
1 time
unit
period
ON
period
Off
Time
STMPE821
CS00054