Hello there,
In my circuit, I have amongst other things, one MCU which drives an lcd-display.
The LCD has RGB backlight which I PWM from 5V no problems. But it has I2C BUS lines which needs to be pulled high (to 3V I suppose? Or can it be pulled to 5V?), and it has 3v5 tolerant VDD pin (3v3 nominal input).
My question:
- Is it safe to pull the i2c pins to 5V using 4K7 resistors?
- Can i use a voltage divider to lower the 5V to 3v3 for the VDD pin? It says VDD current is 1mA nominal, but nothing about the maximum consumption. I am worried that voltage could drop very low, should there be a current spike.
- In short, can I get away without a 3v3 rail by using passives?
Thank you for your time.
Kind regards,
Marius