Part Number: ISOUSB211
Hi Team,
I'm using ISOUSB211DPR in my analog card.
If I'm using Vbus supply from connector and 3.3V Bus on other side, I'm not using any LDO to convert VBUS to 1.8V
In this configuration, does I need to provide external 3.3V and 1.8V from my on board regulators.
Does separate grounds are needed to both sides.
Below is my circuit, please check and provide the feedback
Regards,
Abhishek
Hi Abhishek,
Thanks for reaching out.
For the Power Supply configuration, the above schematic should work fine as VCC1 and VCC2 are supplied with 3.3V.
For more details, I request you to read through section 7.3 in datasheet which describes the different possible power configurations:
Does separate grounds are needed to both sides.
This is not necessary to have for functionality. Separate grounds are needed for HV Isolation. ISOUSB can work even if both GND1 and GND2 are shorted together.
Regards
Varun
Hi Varun,
Thanks for the reply.
For my schematics i had referred the below example schematic provided in the datasheet
In my schematics VCC1 is connected to VBUS 5V and VCC2 is 3.3V(isolated side). I had provided capacitors for USB 1V8 as per this example.
It is fine right.
Regards,
Abhishek
Hi Varun.
Thanks for the confirmation.
In the datasheet, it is mentioned as if VBUS supply from USB is used, then internally IC will produce 3.3V and 1.8V.
First i had directly provided external 3.3V and 1.8V on the pins, now i had removed that option, and provide as an option only.
I will share my final schematics. Please confirm the same
The EQ pins can i left with floating with pull up and pull down options.
Regards,
Abhishek
