proper way to take a digital output from uP to the FOD3180 gate drive / General Science and Electronics / Forums

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proper way to take a digital output from uP to the FOD3180 gate drive

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LAN_403

IamSmooth

Sat Mar 27 2010, 07:06AM

Registered Member #190 Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567

I am using one of the pwm outputs of an ATmega328 uP. I am sending it to the input of an optocoupler gate drive

The input appears to be a type of diode junction. I was going to simply take a lead from the uP and go directly into the gate-drive input. Upon looking at it I think I should have a resistor between the two so as not to ground the pwm output. Is this correct thinking? Would 1k suffice?

Does it matter if the resistor is on the input or the grounding lead of the the FOD3180?

uzzors2k

Sat Mar 27 2010, 10:32AM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

The input is a simple LED, so yes, you'll need to limit the current through it to 25mA average according to the datasheet. The resistor location doesn't matter.

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