STMPE821QTR datasheet(41/55 Pages) STMICROELECTRONICS

tên linh kiện	STMPE821QTR

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STMPE821

Basic PWM controller

41/55

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 10.

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

Figure 11.

Ramps with programmable brightness, ON/OFF period and repetition

Duty

cycle

Time

period

Off

period

Off

period

1 time

unit

CS00054

Duty

cycle

Time

period

Off

period

Off

period

1 time

unit

CS00055

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