Rajinder1268
Full Member level 3
Hi all,
I have a design based around car OBD port.
The current of the design would be 600mA.
I am thinking of using a diode for reverse voltage protection, then a PTC fuse rated at 3A, TVs diode, then my electronics. Most of the 600mA will be from a Bluetooth device @3V3.
I need to power circuits operating from 5V and 3V3.
Is it best to have a 5V linear reg then power a 3V3 linear reg from its output?
Or should they be separate?
Or should I use a buck dcdc for the 5V and then power the 3V3 from this? I am not sure of a good dcdc converter with good efficiency, can anyone recommend one,?
Finally I need to run a CAN interface at 125Kbps. How do I determine the clock frequency (external crystal) for my microcontroller to get the correct bit rate? Is there a simple equation.
Thanks in advance
I have a design based around car OBD port.
The current of the design would be 600mA.
I am thinking of using a diode for reverse voltage protection, then a PTC fuse rated at 3A, TVs diode, then my electronics. Most of the 600mA will be from a Bluetooth device @3V3.
I need to power circuits operating from 5V and 3V3.
Is it best to have a 5V linear reg then power a 3V3 linear reg from its output?
Or should they be separate?
Or should I use a buck dcdc for the 5V and then power the 3V3 from this? I am not sure of a good dcdc converter with good efficiency, can anyone recommend one,?
Finally I need to run a CAN interface at 125Kbps. How do I determine the clock frequency (external crystal) for my microcontroller to get the correct bit rate? Is there a simple equation.
Thanks in advance