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UART (3v3 TTL) Isolator Chip

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sakibnaz

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Hi All.

I want to use isolated UART Communication between two host. My internal host's TTL Level is 3v3 and I want external level 5v with isolation. Can be optical isolation or other.

Can anyone advise me a suitable chip?

Thanks. Looking forward your suggestion.

Regards.
 

u can use optocoupler for this kind of solution. based on the level translation.
 

Hi.

Thanks for suggestion.

All the Chips are very big is size. I have some room limitation in PCB. Is there any other SMD chips with less dimension. Also FODM8061, 6N136 & TCMT1100 can work with 115200 Baud?

Regards.
 

Also FODM8061, 6N136 & TCMT1100 can work with 115200 Baud?
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According to datasheet, FODM8061 and 6N136 should work well at 115200 baud rate. But ordinary phototransistor based opto-couplers like TCMT1100, TLP521, PC817 etc. may not work at this baud rate. Phototransistors have higher collector-base junction capacitance which prevents high speed switching due to miller effect.
 

You also can use TXB0108 level translator from TI.
 

sakibnaz said:
Hi.

Thanks for suggestion.

All the Chips are very big is size. I have some room limitation in PCB. Is there any other SMD chips with less dimension. Also FODM8061, 6N136 & TCMT1100 can work with 115200 Baud?

Regards.
Click to expand...

since these chips contain ir led and a photo transistor, and all communication isolated by light, they are in big size. there is no other way. you have to take this into consideration while designing your circuit.
 

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