Hi,
I have ADC that I want to power with 5V.
I have microcontroller that I power with 3.3V (it can not take higher).
ADC is connected to MCU with I2C - SCL and SDA.
ADC requires pull-ups on SCL and SDA.
If I pull-up with 5V - I am afraid this may burn MCU since this voltage goes to MCU SCL and SDA pins.
So, the question is can I pull-up with 3.3V and power ADC with 5V?
Please do not suggest to power ADC with 3.3V - this works but I want to put it on 5V source because I already have 5V in my design that I can turn on and off that may save energy consumption - this is the whole idea here. 3.3V I can not turn on and off since it is the only power for MCU.
I have ADC that I want to power with 5V.
I have microcontroller that I power with 3.3V (it can not take higher).
ADC is connected to MCU with I2C - SCL and SDA.
ADC requires pull-ups on SCL and SDA.
If I pull-up with 5V - I am afraid this may burn MCU since this voltage goes to MCU SCL and SDA pins.
So, the question is can I pull-up with 3.3V and power ADC with 5V?
Please do not suggest to power ADC with 3.3V - this works but I want to put it on 5V source because I already have 5V in my design that I can turn on and off that may save energy consumption - this is the whole idea here. 3.3V I can not turn on and off since it is the only power for MCU.