6.1 MCU Control Window
The MCU Control window allows external control of the PWM dimming using the
to the
. PWM control is available for each channel with frequency and duty cycle control for
frequencies and duty cycles that are not covered by the register settings. It also allows for 180 degree phase
shift in between channels if desired. For example, if a PWM signal of 4 kHz was desired, they could use this
feature.
PWM 1 is the first PWM generator from the MCU and controls Duty Cycle 1 at PF2 pin of MCU and Duty Cycle 2
at PF3 pin of the MCU. PWM 2 is the second PWM generator from the MCU and controls Duty Cycle 1 at PG0
pin of the MCU and Duty Cycle 2 at GP1 pin of the MCU. PWM 1 generator signals connects to PWM1 (PF2)
and PWM2 (PF3)on the
board. Therefore, the PWM 1 button should be selected when
using the external that is controlled by the
Figure 6-5. MCU Control (External PWM) Window
There are two jumpers that need to be selected to use this feature. J7 and J8 are not loaded with shorting
jumpers by default and they allow for the direct connection of the external PWM from the
by
placing a shorting jumper from pins 1 and 2 of J7 and J8. If the inversion of those PWM signals can be achieved
by placing a shorting jumper across pins 2 and 3 of J7 and J8, see
TPS92520EVM-133
Figure 6-6. External PWM Hardware
TPS92520EVM-133 Power UP and Operation
SLUUCC4 – OCTOBER 2020
TPS92520EVM-133 Dual 1.6-A Synchronous Buck LED Driver Evaluation
Module
37
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