STMPE821_09 datasheet(40/55 Pages) STMICROELECTRONICS

Part #	STMPE821

Description	8-channel capacitive touch key controller

PDF	55 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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40 / 55 page

Basic PWM controller

STMPE821

40/55

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.

Pulses with programmable brightness, ON/OFF period and repetition

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

Duty

cycle

Time

period

Off

period

Off

period

1 time

unit

CS00054

STMPE821 Datasheet(PDF) 40 Page - STMicroelectronics