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SC16IS750 interrupt

Question asked by Robert Kaliauer on May 10, 2017
Latest reply on May 15, 2017 by Robert Kaliauer

Hi,

 

I'd like to use SC16IS750 to bridge I2C to UART. Therefore I would like to use IRQ functionality to prevent software from the requirement to poll for status. For the physical connection in datasheet is mentioned, to use 1k pull-up for 3V3 or 1k5 for 2V5 supply. Would it be possible to use 100k connected to 1V8 power supply as well?  The point is, that I have some host device which hs just 1V8 compatible pins and I'd like to prevent some additional level shifters.

I'm just wondering about pull-up resistor value requirement as based on datasheet, IRQ pin is able to sink up to 4mA, why does pull-up resistor for 2V5 be higher than connected to 3V3?

 

BR

Robert

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