ISO6763-Q1: Do VCC1 and VCC2 have to be equal?

Valentinas Pancerovas

Part Number: ISO6763-Q1

Or can they be different for example 1.8V on one side and 5V on the other side? We want to minimize the current consumption on one of the sides and going down in voltage seems to do that.

Is it more prone to EMI if the voltage is 1.8V?

over 2 years ago

+1 Aaditya V. over 2 years ago

TI__Mastermind 20755 points

Hello,

Thank you for your question.

VCC1 and VCC2 can be different voltages as long as they are within recommended operating conditions. The two supply voltages are independent of each other, VCC1 powers the input side while VCC2 powers the output side. For more information on having different supply voltages for VCC1 and VCC2, please refer to this FAQ: https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/732656/faq-can-i-power-the-two-sides-of-a-digital-isolator-with-different-voltages

The ISO6763-Q1 device has no EMI related concerns across the recommended voltages. If voltage is 1.8V, there should be no affect on EMI performance of the device.

Regards,
Aaditya Vittal

Isolation

Isolation forum

ISO6763-Q1: Do VCC1 and VCC2 have to be equal?