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TPS929121-Q1: LEDs glow although PWM registers are zero

Christoph Bierwipfl
Prodigy 10 points
Part Number: TPS929121-Q1

Hello,

 i want control TPS929121 only with PWM registers. I set all PWML and PWM registers to zero, but LEDs are still glowing.

Only with setting CONF_ENx registers to zero, the LEDs are not active. But i want to reduce bus load and software calculation and not also send this commands to disable LEDs.

If it is important i also use exponential curve (CONF_EXPEN).

  • +1
    TI__Genius 14890 points

    This is designed on purpose. If CONF_EN is set, it's suppose that you are trying to turn on LEDs. Thus, minimum 1/4096 duty cycle is achieved with PWM=0. Please refer to 8.3.3.3 Linear Brightness Control for details.

    If turning off the LEDs is expected, please configure CONf_EN to 0.