I was looking for a PWM expander (something that transform SPI or I2C to severals PWM outputs). I've found the LED drivers, but not the one I'm looking for. It should have 8 output (2 cirtuits of 4 outputs, or 8 circuits of 1 output). The output should be independants (I meant that one output should be at 1 kHz, the 2nd at 5 kHz..) with an output current more than 1 mA per output. The frequency output should be between 500 Hz, and 20 kHz. I found this circuit: https://www.nxp.com/docs/en/data-sheet/PCA9553.pdf
But it doesn't fit with what I want because it only work between 0.172 Hz and 44 Hz. Do you have an idea of the device? Or something close from that device?