Input protection for SN65HVS883

Atapol Eisae

Other Parts Discussed in Thread: SN65HVS883

I am using SN65HVS883 to detect the digital input signal for industrial . I had seen the datasheet and found that it has ESD protection and require a MELF resistor and capacitor. Normally, My input signal is 10 to 30 V and field supply voltage is 12V. My question are following:

1. Do I need more external protection for input such as overvoltage, surge protection?

2. Can I apply the input voltage more than field supply voltage?

3. If I don't want to place the LED at REx pin. How can I do to this pin?

over 7 years ago

0 Louie over 7 years ago

TI__Expert 3180 points

Hello Atapol,

Our data sheets recommend external protection which would address concerns 1 and 2. I have included a screen shot below:

As for concern number 3:

Is there a particular reason why you do not wish to have LED's present?

Thank you,

Louie

0 Atapol Eisae over 7 years ago in reply to Louie

Prodigy 30 points

Dear Louie,
Thank you for answering.
Refer to concern number 3, I need not to show the input status using LED and this can reduce some power consumption. I have seen in digital input stage, the LED is connected to the current limiter in series. But I can use the LED if it is needed.
Regard,
Atapol

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Input protection for SN65HVS883