Can you program PCA9632 with non-default settings?

[CoryP]

Hi, I need a PWM controller to control the brightness of a set of LEDs and I'm considering using the PCA9632. This is perfect for my needs except for one thing.

The power-on configuration appears to be SLEEP with 0% duty cycle on all outputs. I'd prefer if it could power on directly into OSC on, with 50% duty cycle on one of the pins. From my understanding of the datasheet, this must be programmed on every power-on.

Is there a way to configure the power-on defaults so that I don't have to create a script to send 3-4 of the same I2C commands on every power-up? This would complicate things because I would need my microcontroller to do this while it powers up at the same time as this chip.

Thanks,

Cory

[TomasVaverka · Accepted solution]

Hello Cory,

Thank you for considering the PCA9632 for your application.

As you correctly stated, the oscillator is off (low power mode) and duty cycles in PWMx registers set to 0% by default.

Unfortunately, the PCA9632 does not allow to pre-configure the default settings in OTP or similar, it needs to be set every time the power is turned on.

Regards,

Tomas

[CoryP]

Ah I see, thank you for clarifying.

[CoryP]

Oh wait, one more question: Do you know if NXP has any similar product in the same family that does allow this?

[TomasVaverka]

Unfortunately, currently not.

[CoryP]

Ok I see. Thank you again for the information!